Combining For Loop outputs into a Matrix

Hi, I'm relatively new to Matlab. This is my code:

b = 0:3;
for q = 0:10:20
  XY = (40 + 2*q) + cosd(b) 
end

And the output on the command window would be:

   XY = 
   41.0000   40.9998   40.9994   40.9986
   XY = 
   61.0000   60.9998   60.9994   60.9986
   XY = 
   81.0000   80.9998   80.9994   80.9986

I'm struggling to combine the outputs into one matrix like this:

   XY = 

   41.0000   40.9998   40.9994   40.9986

   61.0000   60.9998   60.9994   60.9986

   81.0000   80.9998   80.9994   80.9986

Suggestions/hints would be much appreciated, thanks!

Answer 1

[dpb]

With a loop, you just index...

b = 0:3;
XY=zeros(3,length(b));    % preallocate the output array
irow=0;                   % row counter
for q = 0:10:20
  irow=irow+1;            % increment counter
  XY(irow,:) = (40 + 2*q) + cosd(b);
end

BUT, you "don't need no steenkin' loops!" with Matlab; that's the power of the language with the vectorized functions--

> [Q,B]=meshgrid(q,b);    % generate the grid of points in bot variables
>> XY = [(40 + 2*Q) + cosd(B)].'
XY =
 41.0000   40.9998   40.9994   40.9986
 61.0000   60.9998   60.9994   60.9986
 81.0000   80.9998   80.9994   80.9986
>>

[nico nico]

Thanks!

Answer 2

[Stephen23]

>> b = 0:3;
>> q = 0:10:20;
>> XY = bsxfun(@plus,40+2*q(:),cosd(b))
XY =
       41          40.9998476951564          40.9993908270191          40.9986295347546
       61          60.9998476951564          60.9993908270191          60.9986295347546
       81          80.9998476951564          80.9993908270191          80.9986295347546

[nico nico]

Thanks!