Error "Assignment has more non-singleton rhs dimensions than non-singleton subscripts" when loading a string into a matrix

Hi,

I am trying to load to columns of string into a matrix using the following code:

ABC(xy,1) = num2str(pos); ABC(xy,2) = [' ' stri strj];

xy is the index, "pos" is a four digit number and stri & strj are two strings. When the first line runs I get the error: "Assignment has more non-singleton rhs dimensions than non-singleton subscripts" The variable "pos" is converted successfully but when I try to store it in the array it gives me the error. Using just a single digit works fine.

Any ideas?

Thank you,

Sam

Answer 1

[Walter Roberson]

You cannot have columns of separate strings in any kind of matrix other than a cell array.

Strings are not single objects in MATLAB: they are arrays of characters, so whenever pos has more than one digit, you are trying to store the array with multiple positions in to a single location ABC(xy,1); as you have discovered, that fails.

Consider instead using

ABC{xy,1} = num2str(pos);
ABC{xy,2} = ['   ' stri strj];

Or alternately,

ABC(xy,:) = {num2str(pos), ['   ' stri strj]};