To RESHAP the number of elements must not change.

I got an error while compile the following code To RESHAP the number of elements must not change.

code:

[Result,pData,DataCapture] = AO_GetChannelData(11016);% Analog input_current measure

          line
          %plot(pData)
          pData_res=reshape(pData(1:DataCapture),[pData(1),DataCapture/pData(1)]);
          pData_clean=pData_res(8:pData(1),:);
          pData_new=(reshape(pData_clean,[1,length(pData_clean)*16]))*(10000/2^12);
          plot(1/2750:1/2750:(length(pData_new))/2750,pData_new)
          axis([0 0.12 -200 3000])

Answer 1

[Walter Roberson]

p1 = double(pdata(1));
dc = double(DataCapture);
if mod(dc, p1) ~= 0
  error(sprintf('DataCapture, %g is not evenly divisible by %g', p1, dc));
end
pData_res = reshape(pData(1:DataCapture), [p1, dc]);

I believe if you check you will find that class(pdata) is uint8 and that DataCapture/pdata(1) would be greater than 255 but is being truncated at 255. For example,

(72 * 2131) == 153432

is true (the division is exact), but

153432 / uint8(72)

is uint8(255) instead of 2131, because of the way that operations are carried out when you are working with an integer data class.