Using a for-loop with several input matrices

Question

Chris Matthews 2017-4-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/335811-using-a-for-loop-with-several-input-matrices

评论： Jan 2017-4-18

I have several matrices that I want to run a for-loop through, and am not sure how to do this.

clc
clear all
TEST1 = [0 0 0 0];
TEST2 = [1, 1, 1, 1];
TEST3 = [235.0623 188.2428 44.9479 103.4551];
l = length(TEST3);
for k = 1:l
y(k) = 0;
if (k==1)
w(k) = 1/sqrt(l);
else
w(k) = sqrt(2/l);
end 
for n = 1:l
y(k) = y(k)+TEST3(n)*cos(pi*(2*n-1)*(k-1)/(2*l));
end
y(k) = y(k)*w(k);
end
DCTTEST3 =  (y)

My for-loop works well, and is currently programmed to use test3 matrix as the input, and show the corresponding matrix output.

Is it possible, without triplicating the code, to use this format but run the three test cases through it, and then have three output matrices? If it is, can you please show me how?

Thanks in advance! Chris

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Answer 1

Jan 2017-4-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/335811-using-a-for-loop-with-several-input-matrices#answer_263355

在 MATLAB Online 中打开

TestSet = {[0 0 0 0], ...
           [1, 1, 1, 1], ...
           [235.0623 188.2428 44.9479 103.4551]};
DCTTEST = cell(1, numel(TestSet));  % Pre-allocate
for iTest = 1:numel(TestSet)
  Test = TestSet{iTest};
  l = length(Test);
  y = zeros(1, l);   % Pre-allocate
  w = zeros(1, l);
  for k = 1:l
    if (k==1)
      w(k) = 1/sqrt(l);
    else
      w(k) = sqrt(2/l);
    end 
    for n = 1:l
      y(k) = y(k) + Test(n) * cos(pi * (2 * n-1) * (k-1) / (2*l));
    end
    y(k) = y(k)*w(k);
  end
  DCTTEST{iTest} = y;
end