Cell array multiplication error

Hi everyone, I have a code like this:

for i=1:18
    for j=1:5
        B{i,j}=AvgMatrix(i,j)*r_prob{i,j};
        D{i,j}=B{i,j}.*r_sch{i,j};
    end
    Finalcell{i,1}=D{i,1}+D{i,2}+D{i,3}+D{i,4}+D{i,5};
    Finalarray(i,:)=Finalcell{i,1};
end

in each r_prob cell, there is a 1000 randomly generated numbers. I run this code and it was successful and I close it down. However, when I try to run it again, it gaves me an error "Unable to perform assignment because brace indexing is not supported for variables of this type." for B{i,j}=AvgMatrix(i,j)*r_prob{i,j}. Does anyone know what is the problem? Any help would be appreciated. Thank you a lot.

Answer 1

[Jan]

The error message means, that either B or r_prob is not a cell array. Use the debugger to find out, what type it is instead. Type this in the command window:

dbstop if error

Run your code again, when it stops, check the variables:

class(r_prob)
class(B)

Is B pre-allocate as cell before?

Is this a script or a function? In a script you are using the workspace of the caller. So if B was created as a cell array before in the command window by accident, the code ran. But now with a clean workspace the code fails. This is the reason why scripts should be avoided in productive projects, because they cannot be debugged and tested exhaustively and have severe long range side effects.

[Nevzat Can Yerlikaya]

Thank you so much. You are right I have used B not in this script but in another script and hence, it was in the workspace. I changed the letter and everything works smoothly. Thank you once again otherwise, I would not figure it out.

[Jan]

Because this is the typical problem of working with scripts, decide for using functions for all of your projects.