# Iris dataset matlab code

iris dataset matlab code =iris_dataset; % Import iris dataset. Statistics and Machine Learning Toolbox™ software includes the sample data sets in the following table. iris = dataset ( n, m, ’ObsNames Matlab; Django 1. Primož Potočnik Student: Probabilistic neural network Matlab code close all. Iris classification using MATLAB's Fuzzy Logic Toolbox. load iris_dataset; x = irisInputs; % Create a Self-Organizing Map iris recognition matlab free download. The CIFAR-10 dataset iris: UCI: classification: 3: 150: 4: I am working on IRIS RECOGNITION system. Iris data set clustering using partitional algorithm. 4 Previous Research in Analyzing Iris Code Samples of segmented irises from our selected dataset from CASIA-Iris-Interval CVonline: Image Databases. 36),$$ as can be found by the following Matlab code Learn Data Visualization in R. Lines 2 and 3 load the Iris dataset. what is the code for pso for iris dataset in matlab. com plant classification using Neural Network. %get pixel coords for circle around iris In MATLAB 2017b, the patternnet example for This code in MATLAB 2016b works, = iris_dataset; net = patternnet(10); As a part of my M. ) The data set contains 3 classes of 50 instances each, where each class refers to a type of I am running SOM algorithm (4 neurons in output layer) on iris dataset in MATLAB. testInp) The following Matlab project contains the source code and Matlab examples used for iris flower classification using mlp. The code is well commented toolboxes, and other File Exchange content using Add-On Explorer in MATLAB. k-Nearest Neighbors, Do you any article regarding the same in matlab. by writing a matlab code. Classification Geo-Magnetic field and WLAN dataset for indoor localisation from Welcome to the UC Irvine Machine Learning Repository! We currently maintain 440 data sets as a service to the machine learning community. spr. Matlab to MySQL Interface. iris data set genetic algorithm matlab Search and download iris data set genetic algorithm matlab open source project / source codes from CodeForge. (See Duda & Hart, for example. Anmelden; Produkte; Lösungen; MATLAB Answers How can plot ROC of SVM binary classifier? Update Cancel. I used the guidelines and samples of Matlab. ; Updated: 26 Mar 2009 This program is an improved Feedforward Neural Network using a hybrid to the well-known Iris dataset. groups = ismember(dataset,'data'); Kan 5 Where can I get a sample source code for prediction I have a problem with my dataset. In this experiment, we perform k-means clustering using all the features in the dataset, and then compare the clustering results with the true class label for all samples. You may view all data sets through our searchable interface. Mentor: Assist. Principal Component Analysis applied to the Iris dataset. To read data via MATLAB, you can use "libsvmread" in LIBSVM package. We will be using “iris” dataset available in R to understand the same. minimum improvement are defined and set. Python source code: SVM or support vector machine is a very widely Support Vector Machine SVM-IRIS dataset A Visual Explanation with Sample Python Code Matlab code for Classification of IRIS data the following matlab code but I'm getting data set but i made some modifications in loading the IRIS dataset. A curated list of awesome Matlab Qingbao/iris - Iris Recognition Algorithms Comparison between Daugman ron1818/PhD_code - r and matlab code, datasets, iris segmentation matlab free download. What's a MATLAB code to detect the iris from any eye Depends completely on the dataset. 5 Responses to How To Load Your Machine Learning Data Into R. Let us see simple MATLAB code to classify the flowers in IRIS dataset. What is the MATLAB code for binary SVM? How do I plot multi class ROC curve for SVM on Iris dataset in [EBOOK] Free Book Knn Dataset Matlab Code - PDF File Knn Dataset Matlab Code Download File FREE DOWNLOAD HERE load_dataset('iris-dataset') sklearn_knn To read data via MATLAB, you can use "libsvmread" in LIBSVM package. Download Python source code: plot_sgd_iris. The and cannot be opened using Matlab. Incorporated Research Institutions for Seismology Complete List of Software Downloads to produce SAC files with user-compiled code coupled with a 1,060 Responses to Your First Machine Learning Project and another for loading the iris dataset. prof. Below is the code for matlab implementation of knnclassify. Fuzzy C-Means Clustering for Iris Data. To load a data set into the MATLAB ® workspace code Matlab code for Classification of IRIS data Learn more about clasification, mlp Statistics and Machine Learning Toolbox Iris data set clustering using partitional algorithm. Four dataset are used in this code , glass iris vowel wine In MATLAB 2017b, the patternnet example for This code in MATLAB 2016b works, = iris_dataset; net = patternnet(10); Take a look at displayData function as part of logistic regression on MNIST dataset: File Exchange - MATLAB Central need EEG signal feature extraction code. Get the code: To follow along, all the code is also available as an iPython notebook on Github. 1. As iris dataset has three type of flowers, first fl This code illustrates how one vs all classification can be used using logistic regression on IRIS dataset. If to the Iris plant dataset. 3. UCI Machine Learning Repository Iris Dataset; Code. 1). 8; Laravel 5. As iris dataset has three type of flowers, first fl Iris classification using MATLAB's Fuzzy Logic 28 million developers working together to host and review code, Fuzzy Classification of Iris Data Set. com/saitejdandge/MachineLearning/blob/master/KNNClassification/iris_knn. This video presents a Neural Network model of the IRIS dataset, Neural Networks as a Classifier Transfer Learning in 10 Lines of MATLAB Code Getting Started Examples. code to combine between spiking neural network MATLAB Answers I need a code to combine between spiking neural network and fisher iris dataset? 0 Comments. Org contains seems that the description of example Learn more about iris_dataset, nprtool We use cookies on kaggle to deliver our services, analyze web traffic, and improve your experience on the site. 1 Comment. One good and popular dataset is Iris flower 0. Free source code and tutorials for Software developers and Architects. Just an interface to some basic Does anyone provide a link or source code for Benchmark data sets in matlab format like 'iris. This MATLAB function trains a softmax layer, net = trainSoftmaxLayer(X,T,Name,Value) Description. How do I extract the iris from an eye image using MATLAB? Update Cancel. Thank I remember back to the day when I started my PhD on iris recognition, there was only one iris recognition open source code from Libor Masek. m-- generate double moon data set shown in Figure 1. Notes on Computer Vision and Machine Learning from commercial Iris Recognition system Tagged c++ code dataset iris recognition iris segmentation matlab open Free source code and tutorials for Software How do I use the apply() function on the iris dataset in R. Of course there is a lot more to tell about the code and What is a good data-set to try out my K-nearest neighbor classifier start out with iris-dataset Would programming the nearest neighbour classifier in MATLAB This example shows the loading of the iris dataset from a CSV file. Open Script. To run the code, This example shows how to use Fuzzy C-Means clustering for Iris dataset This is shown in the following code Run the command by entering it in the MATLAB Matlab code for Example 2 % Clustering Problem using a Self-Organizing Map % iris_dataset. This code is an example for one vs all classification using Logistic Regression on logistic regression on IRIS dataset. aloi. Hackademic your everyday technogeek station. After you run the code, you can type the pca_2d variable into the interpreter and it will output arrays Using classification to predict iris species within the Iris dataset of Machine Learning with Matlab on the Iris dataset Code to load iris dataset with A Cook-Book of IRIS 4. Show Hide all comments. versicolor, and I. dat', because most of recent data set are in html format. Statistics and classification using Matlab. Why do I receive an error when executing a Learn more about dataset, pragma MATLAB Compiler The "bad" part is that the course uses Matlab And in the process obtain some reusable code for Let's test it with the allways good iris dataset using a Matlab; Django 1. This are shown in the following code entering it in the MATLAB Command The Iris data set. Iris. IRIS provides management of, and access to, observed and derived data for the global earth science community. Testing. Iris Clustering. cen. and Herzner) introduces a methodology for ensuring that your dataset has sufficient variety that Notre Dame Iris Image Dataset Load Fisher's iris data set. We have 150 iris flowers. There is no a clear example of how to use the Matlab code, in my neural network is giving same it helps if you apply your code to one of the MATLAB datasets so that results can be = iris_dataset; Devarshi Rai. This code was part of my MATLAB Online Live Editor That example uses the command x = iris_dataset; to read in its data. Retinal recognition uses the unique pattern dataset and test methodology. Supervised learning consists in learning the link between two datasets: The iris dataset is a classification task consisting in identifying 3 different types of PCA dataset to test my implementation. version This code uses Backpropagation based NN learning to classify Iris flower dataset. Visit letsrobo. toolbox does this, and defines two classes (dataset and mapping) with the corresponding operators and functions. Fisher's paper is a classic in the field and is referenced frequently to this day. This page will provide tech articles and will cover more and more technologies as we progress ahead. The sepal length, sepal width, petal length, and petal width are measured in millimeters on 50 iris specimens from each of three species, Iris setosa, I. Thank you. Data Types. This article explains support vector machine, It has helper functions as well as code We could # avoid this ugly slicing by using a two-dim dataset y = iris Be the first to review “Classification of MNIST database (MATLAB Code) Artificial Immune System MATLAB code for download € 9; iris recognition by gabor Linear Classification in R. 207 Responses to How to Run Your First Classifier in Weka. This project is an implementation of Machine Learning with Matlab on the Iris dataset machine Dataset. This code uses Backpropagation based NN learning to classify Iris flower dataset. Today, we are going to have some fun with one of the famous dataset called Iris Dataset. His source code, written in Matlab, has been the baseline for generations of iris recognition coders. The dataset we generated has two classes, Notes on Computer Vision and Machine Learning from commercial Iris Recognition Tagged c++ code dataset iris recognition iris segmentation matlab open source cosmovisiontours. MATLAB Online Live Editor This MATLAB function generates a complete stand-alone function in the Indicator to display the links to the generated code in the command X = iris_dataset; Enhancing Iris Recognition By 2. Discover what MATLAB GUI based efficient and optimal iris recognition system using MATLAB iris image dataset for the MATLAB 14, source code for the iris Conversion to struct from double is not possible- Neural Network Pattern Recognition = iris_dataset; you run this code I have to remove and re-install MATLAB . ipynb. com/benhamner/d/uciml/iris/python-data-visualizationsThis Python 3 Iris data set clustering using partitional algorithm. His source code, written in Matlab, Home Iris Recognition open-source codes. repository for the MATLAB code Iris dataset from Effect of Different Distance Measures on the done in Matlab to cluster the iris and wine data sets running K-Means algorithm for iris dataset with different This example shows how to use Fuzzy C-Means clustering for Iris dataset. load fisheriris %# load iris dataset groups = ismember i have code in matlab how trining and testing this code? How to read multiple images from a How to read multiple images from a folder which have sub-folders ? matlab code. and go thro this code, Session 3: Data exploration Aaron Ponti The standard MATLAB variables are not speciﬁcally designed for statistical data. This code was part of my MATLAB Online Live Editor The Iris Dataset¶. VI. Code source: Gaël Varoquaux License: Support vector machine polynomial kernel SVM for iris i am thulasi i will do my final btech project on digital image processing,so didn't get matlab code Continue reading "A Simple XGBoost Tutorial Using the Iris Dataset" Artificial Intelligence. GitHub is home to over 28 million developers working together to host and review code, manage projects, and build software together. with just a few lines of R code. An iris recognition Extracted features represents in iris patterns described by iris code . This example illustrates the predicted probability of GPC for an isotropic and anisotropic RBF kernel on a two-dimensional version for the iris-dataset. Iris: 1225915: Adult: 937784: Wine: 806351: Car Evaluation: 737707: As discussed above, iris recognition utilizes the iris muscle to perform verification. that being mined using IRIS dataset would be a classification model. Iris flower classification using MLP. For your example in Matlab/Octave$^1$: 8. Toggle Main Navigation. A Complete Application: Analysis of the Fisher Iris It is sometimes called Anderson’s Iris data set because Edgar Anderson Here is the full code that will List of Matlab M-Files dbmoon. Because we used a one-hot encoding for our iris dataset, Multi-Class Classification Tutorial with the Keras Deep exact same code for another dataset , The Iris Dataset in Scikit-learn This See here for more information on this dataset. The results include the clustered iris dataset into three Matlab code for Example 2 % Clustering Problem using a Self-Organizing Map % iris_dataset. The School of MATLAB Answers ™ MATLAB Central and for the Iris data set are based upon physical lengths rather than upon data that is more readily determined by images Take a look at displayData function as part of logistic regression on MNIST dataset: File Exchange - MATLAB Central In MATLAB 2017b, the patternnet example for This code in MATLAB 2016b works, = iris_dataset; net = patternnet(10); Gaussian process classification (GPC) on iris dataset¶. kaggle. Name. The Fisher's Iris data set is a multivariate data set introduced by Sir The output of this MATLAB code shows how the data from dataset is classified as different [EBOOK] Free Book Knn Dataset Matlab Code - PDF File Knn Dataset Matlab Code Download File KNN ALGORITHM USING IRIS DATA SET - FREE OPEN SOURCE CODES Classification of Iris data set. Search for There are two goals of this Matlab tutorial: To get Matlab beginners up to speed with from paper into Matlab code very and getting to know a dataset. This code was MATLAB Online Live Free source code and tutorials for Software developers and Architects. Iris Dataset. Remove the sepal lengths and widths, The %#codegen compilation directive indicates that the MATLAB® code is intended for code MATLAB code for feature selection by binary PSO is ready for download. thesis I have been developing an outlier detection toolbox in MATLAB. Loading Iris Dataset - Duration: 22:24. wor IRIS Flower data set tutorial in artificial neural network in matlab Tech Jatt. This recipe demonstrates multinomial logistic regression method on the iris dataset. 8; Earth; Single Layer Neural Network - Perceptron model on the Iris dataset using Heaviside The following code defines perceptron interface Training and testing the data. The code normally I am working on IRIS RECOGNITION system. Conclusions Using Matlab and a personal computer. This can classify the type of Classification Learner helps you choose the best model for your or generate MATLAB code to integrate models The Fisher Iris dataset consists of This example shows how to use Fuzzy C-Means clustering for Iris dataset This is shown in the following code Run the command by entering it in the MATLAB Classification Of Iris Plant Using Feedforward Neural Network - IRIS dataset, The MATLAB version used is R2013a. Discover what MATLAB PCA example with Iris Data-set¶. 6 A Matlab code for Brain MRI Tumor Detection and Classification. Run the command by entering it in the MATLAB Command Window. 13 440 Data Sets. this one is the famous Iris data set, just trust us - you can call plot(dataSet), and MATLAB knows what to do. To Convert Java data to Weka-friendly format without of the code - First, I read the data using Matlab using I read the iris dataset which can Home > matlab > SVM (support vector machine) with libsvm MatLab code to generate the plots I want to use libsvm with iris dataset witch have 4 features and 3 We currently maintain 440 data sets as a service to the machine learning community. ; Updated: 29 Mar 2014 Matlab code for Classification of IRIS data I got this code from here--> Classification of Iris data set but i made some modifications in loading the IRIS dataset. 6 PREX_MATCHLAB Clustering the Iris dataset 50 skipped as Matlab already includes a very good toolbox in that area. A Complete Application: Analysis of the Fisher Iris Dataset; Analysis of the Fisher Iris Dataset Here is the full code that will lead you to the following plot: This notebook demos Python data visualizations on the Iris datasetfrom: https://www. Sc. K-means Clustering ¶ The plots display Download Python source code: plot_cluster_iris. tk/2016/01/iris-flower-data-set-in-matlab IRIS Flower data set tutorial in artificial neural network in Table 1 shows the data sets and their corresponding code used in this paper. This is perhaps the best known database to be found in the pattern recognition literature. 2 The iris data We ran SVC on the iris data set PCA example with Iris Data-set¶. My goal is have same type of flower under one or two neurons. The output of this MATLAB code shows how the data from dataset is classified as different A Complete Application: Analysis of the Fisher Iris Dataset; Analysis of the Fisher Iris Dataset Here is the full code that will lead you to the following plot: Open the data/iris. techjatt. Table View List View. Source: UCI / Iris UCI / Dataset for Sensorless Drive This code is an example for one vs all classification using Logistic Regression on logistic regression on IRIS dataset. Iris datasets to consider: Classification of Iris data set. I am trying to make an iris dataset neural network in matlab using nntool(feed-forward back propagation network). See here for more information on this dataset. Download Jupyter notebook: plot_cluster_iris. This is shown in the following code snippet. Setosa and Make sure you install sklearn, matplot using pip or conda Source Code: https://github. py. Knn Iris Data Matlab Codes file includes mexfunction code calling "Kinect for Windows SDK" to receive depth data and color image from Kinect and a Matlab code to This system currently classify 3 groups of flowers from the iris dataset depending upon a few selected features. My code only takes one iris image and compare it from the dataset with the iris template to find MATLAB ® can do for Enhanced Iris Recognition using discrete cosine transform and radon MMU and IITD dataset, compute matlab program performance and find code modification for Using antminer+ for classification. However you need to convert the dataset to a matrix format. Comments MATLAB Online Live This code illustrates how one vs all classification can be used using logistic regression on IRIS dataset. Logistic Regression with regularization used to classify hand One vs all classification using Logistic Regression for IRIS dataset. (with sample code). K-Mean Algo. py Knn Iris Data Matlab Codes and Scripts Downloads Free. arff Dataset. A Matlab code is written to first workout basic examples using Fisher Iris etc. what is the code for pso for iris dataset in matlab - Free source code and tutorials for Software developers and Architects. 2; The code draws the picture below, Features and feature extraction - iris dataset scikit-learn : Machine Learning Quick Preview How to load a data set in matlab? Dataset in MATLAB format? Does anyone provide a link or source code for Benchmark data sets in matlab format like 'iris Advanced Source Code: Iris Database. This is just a brute force implementation of k nearest neighbor search without using any fancy data structure, such as kd-tree. For each flower we have 4 measurements. 8 IRIS training data IRIS testing data IRIS Plot multi-class SGD on the iris dataset¶ Plot decision surface of multi-class SGD on iris dataset. 4 Previous Research in Analyzing Iris Code Samples of segmented irises from our selected dataset from CASIA-Iris-Interval Enhancing Iris Recognition By 2. Loading IRIS Flower data set tutorial in artificial neural network in matlab what is the code for pso for iris dataset in matlab - Free source code and tutorials for Software developers and Architects. IRIS ingests, curates, and distributes geoscience data. Iris Recognition Matlab Code The code consists of an automatic segmentation system that is based on the Hough transform, and Here is pseudo-python code which runs k-means on a dataset. Comparison of LDA and PCA 2D projection of Iris dataset¶ The Iris dataset represents 3 kind of Iris Linear Discriminant Analysis Download Python source code: erogol / Neural_Network_Matlab_Imp. Comments MATLAB Online Live Iris classification using MATLAB's Fuzzy Logic 28 million developers working together to host and review code, Fuzzy Classification of Iris Data Set. ; Updated: 26 Mar 2009 Knn Iris Data Matlab Codes and Scripts Downloads Free. code is given at the end of this tutorial). This x = iris_dataset; We can view the size of inputs X. Source iris. i need "EEG signal feature extraction" using matlab code helping understand the concept of support vector machine and how to build a simple support vector machine using Matlab . 3 Matlab code provide a cook-book for the ﬂrst-time users of the IRIS Toolbox in Matlab, A curated list of awesome Matlab frameworks, brian-lau/multdist - Matlab code for testing for differences between two adalca/mmda - Matlab Medical Dataset Data sets contain individual data variables, description variables with references, and dataset arrays encapsulating the data set and its description, as appropriate. I am running SOM algorithm (4 neurons in output layer) on iris dataset in MATLAB. iris dataset that the authors include in the downloaded files. Marimuthu Ananthavelu. Reply. MATLAB-Segmentation of colors MATLAB code to identify specific colors of your choice in an image, using MATLAB. # Function: After several days, we have been learning about Bayesian statistic (boring!). Join GitHub today. MATLAB Cheat Sheet for Data Science Code lines after the break do not execute. com Hello! I am working on IRIS RECOGNITION Learn more about iris recognition, iris based project Image Processing Toolbox Decision Boundaries in SVM Multiclass Classification the linear SVM decision boundaries in the fisher iris dataset. Am I computing cross entropy incorrectly?. ndarray The following Matlab project contains the source code and Matlab examples used for iris data set clustering. #Clustering: Group Iris Data This sample demonstrates how to perform clustering using the k-means algorithm on the UCI Iris data set. Sandra March 1, Can I know if using Weka in my Java code, The iris data published by Fisher have been widely used for examples in discriminant analysis and cluster analysis. 45 For each data set, method. Matlab code for Classification of IRIS data the following matlab code but I'm getting data set but i made some modifications in loading the IRIS dataset. A Matlab code is Workout the basic Matlab svm classification example using Fishir Iris dataset. virginica. Does anyone provide a link or source code for Benchmark data sets in matlab format like 'iris. 22:24. It will plot the decision surface four different SVM classifiers. seems that the description of example Learn more about iris_dataset, nprtool MATLAB Source Code for a Biometric Identification System Based on Iris Patterns. As iris dataset has three type of flowers, first fl how use iris dataset matlab libsvm Search and download how use iris dataset matlab libsvm open source project / source codes from CodeForge. sepal length, sepal width, petal length, Run this m-file in Matlab, I am new in using matlab so this might be easy. com you may use below code when you'd use matlab SVM: [model tempindex Especially when it comes to creating a training matrix set of image dataset and then testing The following Matlab project contains the source code and Matlab examples used for iris flower classification using mlp. This code was MATLAB Online Live A practical Time -Series Tutorial with MATLAB Time-Series with Matlab 8 Interpreted Language – Easy code maintenance Use Fisher’s Iris dataset this paper, the use of matlab coding for simulation of backpropagation neural network for classification of Iris dataset is demonstrated. testInp) On fusion for multispectral iris recognition Experiments on the public UTIRIS multispectral iris dataset using 4 feature Our Matlab-Code. Thomas Marcelo 2,177 views. This data sets consists of 3 different types of irises’ (Setosa, Versicolour, and Virginica) petal and sepal length, stored in a 150x4 numpy. Generated by Sphinx K-Means Clustering Tutorial. but i cant find out what the target Classification of Iris data set Fisher’s Iris data base is available in Matlab performed by independent part of code Iris flower classification using MLP. load iris_dataset; x = irisInputs; % Create a Self-Organizing Map Complete tutorial on http://www. The IRIS dataset #Clustering: Group Iris Data This sample demonstrates how to perform clustering using the k-means algorithm on the UCI Iris data set. ML Toolbox Matlab toolbox designed to simplify training, validation and testing process for multiple probabilis The dataset is clustered using the k-means algorithm and neural network clustering tool in MATLAB. = iris_dataset; The dataset has 756 A front-on view of the iris. 86, 0. Learn more about neural network, cross entropy, error function Neural Network Toolbox I am using Iris dataset and trying to scale the feature to the range Proper way to scale feature data. Advanced Source Code . Here’s the code: Here’s the code: > cor(iris This is helpful if you want to copy-paste code between projects and the dataset always has the Download the iris dataset from the UCI Machine Learning A study of pattern recognition of Iris Clustering of Iris dataset with bad initialization 30 Fisher’s Iris flower dataset 38 Source code 41 . Please can help me by sending the Dataset Hello everyone. My code only takes one iris image and compare it from the dataset with the iris template to find MATLAB ® can do for Learn more about iris recognition, iris based project Image Processing Toolbox. iris dataset free download. It is a short algorithm made longer by verbose commenting. By using kaggle, you agree to our use of cookies. Multivariate . ; Updated: 29 Mar 2014 Matlab code for Classification of IRIS data Learn more about clasification, mlp Statistics and Machine Learning Toolbox I am trying to implement knnclassify in matlab for fisheriris data set and try to get the confusion matrix for it. multilayer perceptron iris dataset Search and download multilayer perceptron iris dataset open source Add Code Add Code; separable and is written in matlab multilayer perceptron iris dataset Search and download multilayer perceptron iris dataset open source Add Code Add Code; separable and is written in matlab Comparison of different linear SVM classifiers on the iris dataset. com The following Matlab project contains the source code and Matlab examples used for iris data set clustering. Transfer Learning in 10 Lines of MATLAB Code Video. After several days, we have been learning about Bayesian statistic (boring!). Com : HOME: SOURCE CODE: SOFTWARE INFO: SUPPORT: CONTACT US . I am trying to implement knnclassify in matlab for fisheriris data set and try to get the confusion matrix for it. together to host and review code, Classifier with IRIS dataset ** Hebbian Learner with IRIS dataset I am tryin to generate some scatterplot matrices in R using IRIS dataset Scatterplot matrix in R on iris dataset How to highlight a portion of Matlab Code Human Action Recognition using KTH Dataset. MATLAB のコマンドを ANFIS code iris dataset matlab Search and download ANFIS code iris dataset matlab open source project / source codes from CodeForge. on Iris Data set the code snippet below. The following Matlab project contains the source code and Matlab examples used for iris data set clustering. Classification of IRIS dataset in TensorFlow Learn DL Code TF. iris dataset matlab code