MATLAB: How to concatenate two or more arrays without using num2str

concatenate arrays

For example if I have two vertical arrays:

A = [1;2] B = [3;4]

I need this output:

C = [13; 24]

The problem is that my arrays have many rows, thus num2str is too slow. What can I do? Thanks!!!

Best Answer

The most obvious solution is to appreciate how a number is constructed in decimal form. So, rather than convert to characters, then concatenate, and then go back in to numeric form, simply use base 10.

C = 10*A + B;

Related Solutions

MATLAB: Is there a simpler or more efficient way to do the following

You could for example do this

function B = label1(A)
[rows,cols] = size(A);
B = ["",string(1:cols);[string((1:rows)')+char(9),A]];
end

I don't claim that it is simpler/more efficient, nor the most compact. Mixed feelings on whether it is a useful learning/teaching snippet either.

Likely the hw problem was written before "strings" were actually a thing, and the answer saught is a character array. At least that would be the more interesting hw problem to pose imho.

MATLAB: How to use num2str

      ['x-' num2str(j) '.^2+ (y-0.5).^2<0.1^2,'  'x,'  'y,'  'z'];

Best Answer

Related Solutions

MATLAB: Is there a simpler or more efficient way to do the following

MATLAB: How to use num2str

Related Question