What does this error mean? Error ??? Index exceeds matrix dimensions.. Code included.

close all; 
clear all; 
dbstop if error

lambda2 = [2 4 6 8]; 

theta2 = [0*pi/180, 45*pi/180, 90*pi/180, 135*pi/180, 180*pi/180, 225*pi/180, 270*pi/180, 315*pi/180]; 

no_lamd = 4; 

no_theta = 8;

psi = [0 pi/2]; 
gamma = 0.5; 
bw = 1; 
N = 1;

%%%%%%%%%%%%%%%%%%%%%%%%

ext = '.bmp';

dirr = 'D:\GPDSdataset\';

[tr_data] = textread('trainfile_source.txt','%s'); %train 

[mtr ntr] = size(tr_data);%mtr

%assign class no 

model = 100; 

train = 5;

cnt = 0; 

for i = 1:5:5*model

cnt = cnt + 1; 

for j = 0:1:4

ts_class(i+j)=cnt; 

end 

end 

save ts_class ts_class

%select train image 

model = 100; 

cnt1 = 0;

cnt2 = 0;

for j = 1:20:20*model 

for i = 0:1:4 

cnt1 = cnt1+1; 

AR_train(cnt1) = tr_data(j+i);%(THIS IS THE ERROR) 

end 

cnt2 = cnt2+1; 

AR_test(cnt2) = tr_data(j+5); 

end

size (AR_train');

size (AR_test');

Answer 1

[Paulo Silva]

The error message tells all you need to know, you are requesting one index bigger than the maximum index of the matrix, I can't test your code, change the part of the loop to:

numel(AR_train) %this value gives you the maximum index for AR_train
numel(tr_data)  %this value gives you the maximum index for tr_data

for i = 0:1:4
cnt1 = cnt1+1  %remove the ;
j+i %add this to monitor the j+i value
AR_train(cnt1) = tr_data(j+i);%(THIS IS THE ERROR)
end

run the code and look at the values that appear on your workspace, cnt1 can't be bigger than numel(AR_train), and j+i can't be bigger than numel(tr_data)

[Mo]

thanks paulo but which part of the code should i change to..tq

[Paulo Silva]

Ok looking better at it you just need to look at the variables you get after the error occurrence, all the clues are there, also get the values:

numel(AR_train) %this value gives you the maximum index for AR_train

numel(tr_data) %this value gives you the maximum index for tr_data

and see if the problem is with AR_train(cnt1) or with data(j+i)

to solve the problem just correct the index values so it never goes beyond the maximum index of the variable