Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.

I'm run this script. Could someone help me

rvar_selec=find(sum(Rsel_matrix)>=(ncut)); if (length(rvar_selec)==0) rvar_selec=find(sum(Rsel_matrix)>(0.25*nstab)); end  
if (length(rvar_selec)==0) rvar_selec=rset; end
TrDat_rselec=TrDat(:,rvar_selec);
TeDat_rselec=TeDat(:,rvar_selec);
Model3 = fitcecoc(TrDat_rselec,TrLab_perm)
PredLab2(:,perm)=predict(Model2,TeDat_r) %* (Here, it indicates the error: Unable to perform assignment because the indices on the left side are not compatible with the size of the right side)
PredLab3(:,perm)=predict(Model3,TeDat_rselec

Answer 1

[Walter Roberson]

The output of predict(Model2,TeDat_r) will be a vector with the same number of rows as TeDat_r has. But TeDat_r is undefined here -- you probably want to predict(Model2,TeDat_rselec)

You would have a problem if perm is non-scalar.

You would have a problem on the second iteration of this code, if TeDat_rselec changes size then the number of rows output would change.