MATLAB: How to predefine a variable

error messagefor loopvariable

I have predefined the variable:
no_of_zeros = cell(1,54);
however when I run my code it says:
'Index exceeds matrix dimensions.
Error in testrun (line 32) no_of_zeros = size(mydata{i,1},5) – nnz(mydata{i,1}(:,5)); %number of zeros'
My script following the pre defined varaible is:
for i=1:length(mydata)
      no_of_zeros = size(mydata{i,1},1) - nnz(mydata{i,1}(:,5)); %number of zeros
      no_of_frames = (no_of_zeros/4) % number of frames 
      time = ((no_of_frames/fps)/2) % time up
      jumph(i,1)=((a*(t*t))/2) % jump height
end
Where am I going wrong?

Best Answer

In the first line of your for loop, you're referring to the fifth character of the cell mydata{i,1}. Is it possible that the cell you're referring to doesn't have enough characters? Also, no_of_zeros is scalar (it's size is 1), so you don't need to pre-define it. Just make sure "nnz(mydata{i,1}(:,5))" doesn't produce an error.
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