Code works in matlab command window, doesn't work in app designer code view

Hi all,

I have a Datamatrix A with size 393x171

from this I make a new matrix B with certain columns from matrix A.

B=A(:,2:5:68); size 393x14

and then from it only the maximum values in one column

B=max(B,[],2); size 393x1

If I write these codes in matlab command window, it works very well and no error.

If I write same codes in app designer code view, it doesn't work and give below errors.

B=A(:,2:5:68);  --> Index in position 2 exceeds array bounds (must not exceed 1).
B=max(B,[],2); -->Error using max, Invalid data type. First argument must be numeric or logical.

Thank you in advance for your support.

Mustafa

[DGM]

It seems to me that the problem isn't with these lines, but the fact that A doesn't have the expected size. You'll need to verify that (check size(A) before that first line) and then try to find out why it's happening. If you can produce a working example of the error, you can attach relevant files or code excerpts.

[Abdul Basith Ashraf]

You are overwiting B. Could that be the issue?

While you debug, use a new variable

C=max(B,[],2);

[Mustafa Uslu]

@DGM: I have checked the size of Matrix A firtsly and then it has worked. Thank you for your solution.

@Abdul Basith Ashraf: I have already tried your suggestion, I have seen no impact.

Still exists below error message:

B=max(B,[],2); -->Error using max, Invalid data type. First argument must be numeric or logical.

[Mustafa Uslu]

Hi,

I also solved the second issue, in order to write before code

B=A(:,2:5:68); 
B=struct2array(B);
B=max(B,[],2);

Thanks for your support

Mustafa

[Jan]

The readers cannot guess that "Datamatrix A with size 393x171" means a struct array.

[Mustafa Uslu]

Hi Jan,

you have right, sorry for that, but I didn't know first;-)

Thank you anyway.