matlab - Draw shaps of squares using PTB -


i want draw 4 squares, side side, using ptb experiment, code not work.. here code, 

square_size = [0 0 50 50];                squarexpos = [screenxpixels * 0.125 screenxpixels * 0.25 screenxpixels * 0.5  screenxpixels * 0.75];    numsqaures = length(squarexpos);                  allcolors = [1 0 0; 0 1 0; 0 0 1; 1 0 0];                       allrects = nan(4, 4);                       = 1:numsqaures                                 allrects(:, i) = centerrectonpointd(square_size, squarexpos(i),  ycenter);              end                             screen('fillrect', window, allcolors, allrects);                         screen('flip', window);                          kbstrokewait;

if knows how can fix problem, please me.

it's hard without seeing error.

if had guess, there's wrong format of inputs.

here's potential problems noticed @ first glance.

  1. psychtoolbox (unlike matlab) uses rgb scale 0 - 255 instead of 0 - 1. code colors show black. instead of [1,0,0] red, use [255,0,0].

  2. your allcolors matrix nitems x 3(rgb), function wants opposite way. instead of entering allcolors, need transpose: allcolors'.

if i'm struggling pscyhtoolbox, first thing check formatting of inputs. appropriate format inputs, type:

screen('fillrect?')

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