I was working on Matlab R2015a's Classification Learner Toolbox. I successfully imported the file data and export it using Export Model, and i got a structure named trainedClassifier. But while running its showing the following error

matlab code clc; clear all; close all; a= readtable('input.csv'); height = [167; 152; 150; 159; 275; 285; 200; 253]; T =height; yfit = predict(trainedClassifier, T{:,trainedClassifier.PredictorNames})

error Undefined function or variable 'trainedClassifier'.

Error in check (line 7) yfit = predict(trainedClassifier, T{:,trainedClassifier.PredictorNames})

[Ceethal Kottakali Piyus]

Someone, please help me...I'm working on an EEG classifier based project for that this Classification Learner Toolbox will be a great help, but I got stuck in the very beginning...

Answer 1

[Sean de Wolski]

trainedClassifier is not in your workspace because you have a clear all at the beginning of the script which is clearing it.

I would recommend saving it after exporting and then loading in the script

Export from app.

save trainedClassifier.mat trainedClassifier

In script

load trainedClassifier.mat
predict(etc...)

[Ceethal Kottakali Piyus]

It worked. Thank you for the help :)

Answer 2

[Roya Salehzadeh]

Hi,

I have trained a classifier in MATLAB 2022 and saved it. I need to load the trained classifier inside a matlab function in Simulink (non in an m.file ) in MATLAB 2015a, and then use predict() fucntion. . Do you have any idea on how I should do that?

These commands work fine for the MATLAB 2022, when I use them inside the matlab function of Simulink block but they are not available for MATLAB 2015a:

• saveLearnerForCoder()
• loadLearnerForCoder()

For MATLAb 2015a, I tried to save the classifier in MATLAB 2022a as a mat file and then load the matin MATLAB 205a file and use predict function. It works when use these commands in command window or m.file, but When I use these inside the simulink matlab function I recieve an error.

function label = svmIonospherePredict(XTest) %#codegen

load('MdlLinear.mat'); %%% this loads an object

[label] = predict(MdlLinear,XTest);

end

• The output of a call to 'load' is not assigned to a variable. Assign its output to a variable without subscripting.
• Undefined function or variable 'MdlLinear'.