Multinomial logistic regression code

2018 7 30
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I am new learner in the field of classification, and am stuck with a problem while implementing logistic regression:
My data set consists of about 315 measurement, with 19 features. I implemented logistic regression model.when i run my code error occure in these two lines.
Error in main function
plotdecisionboundry(theta,X,Y) %error
Error in plotdecisionboundry function
Z(i,j)=mapfeature(u(i),v(j))*theta; %error

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