MATLAB: How to subtract a value from passed variable.

MATLABsubtract

I am working on a program to read the RGB values and I need the array to start at 0 but currently it starts at 1. Here is the code
sourceimage = '/Users/tapotter/Animations/dblogofilled.gif'; %Pull file to load
numframes   = numel(imfinfo(sourceimage)); %Pull the number of frames
fid         = fopen('FastLEDAnimation.txt', 'a+'); %Open files to use.
framedelay  = imfinfo(sourceimage);  % Once only outside the loop
fdelay      = framedelay.DelayTime;  % Get the frame delay
oldFrame    = Inf;                   % Arbitrary unique value
A = 1;
for iframe = 1:numframes %Go through each frame of the gif
  [img, map] = imread(sourceimage, iframe);
  rgbimg     = im2uint8(ind2rgb(img, map));
  crgb       = reshape(permute(rgbimg, [3, 1, 2]), 3, []);
  Frame      = [1:size(crgb, 2); double(crgb)];
  changed    = any(Frame ~= oldFrame, 1);
  oldFrame   = Frame;
  fprintf(fid, 'leds[(minus(%d, A)].setRGB(%d, %d, %d);\n', Frame(:, changed));
  fprintf(fid, '\nFastLED.delay(%d);\nFastLED.show();\n', fdelay);
end
fclose(fid);
fprintf('\nComplete!\n\n');
Here is the line of code I am trying to use to minus the value given from the function,
fprintf(fid, 'leds[(minus(%d, A)].setRGB(%d, %d, %d);\n', Frame(:, changed));
I have tried changing the 'leds[%d}.setRGB(%d, %d, %d);\n' to use the minus, I tried just doing leds[%d – 1}.setRGB(%d, %d, %d);\n' but all it does is either add those words or the -1. How would I minus the value passed? I need it to start at 0 instead of the current "1" it is starting with.

Best Answer

Frame      = [0:size(crgb,2)-1; double(crgb)];
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