MATLAB: Overwriting in a loop

for looploopoverwritepercentage

Hi guys,

I'm trying to workout a percentage for button errors using a loop. I have managed to do this but I can't figure out how to stop overwriting my previous loop. Its the last line i'm having trouble with and I'm not sure whether putting this into a matrix is the correct way of saving the percentage.

for i = 1:numel(fields);

for j = 1:numel(fieldsone);

count_rows = height (ButtonError.(fieldsone{j}));

rows = height (my_structure.(fields{i}));

percent = count_rows/rows*100;

percentageError {i}= [percent];

end

TIA

Best Answer

You have two for loops with loop counters i and j. You last line is using the outer counter, i. If you want to keep every value, you will need to use both indices. Try something like this

percentageError(i,j)= [percent];

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Try it without loops, in a more MATLAB-ish vectorized way:

indexesToSum = a>=4 & a<=15
Re = sum(a(indexesToSum))

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If data is a 2-dimensional array then percent_correct is a scalar so you need to make sure it is saved in one exact place in the percent array.

Also it helps if you preallocate the matrix before the loop:

rows = 50;
cols = 11;
percent = zeros(rows, cols);
for ii = 1:cols
  ...
  for j = 1:rows
    ...
    percent(j, ii)=[percent_correct];
  end
end

Best Answer

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