Looping over function string arguments

Question

Egor 2014-6-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/134841-looping-over-function-string-arguments

编辑： Egor 2014-6-17

The problem is:

%%%%%%%%%%%%%%%%%%%%%%%%%%%This works fine %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%interpolation='bicubic';
interpolation='bilinear';
for scale=1:4
  for image_idx={'01', '02', '03'}
    img_name = strjoin(cellstr(['E:\', image_idx, '.tiff']));
    Iin = imread(img_name);
    ...
    Iout = imresize(Iin, scale, interpolation);
    ...
  end
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%This does not %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
for interpolation={'bilinear', 'bicubic'}
  for scale=1:4
    for image_idx={'01', '02', '03'}
      ...
      Iout = imresize(Iin, scale, interpolation);
      ...
    end
  end
end

Second case throws an exception:

Index exceeds matrix dimensions.
Error in imresize>parseMethodArg (line 432)
    kernel_width = method{2};
Error in imresize>parseInputs (line 252)
    [params.kernel, params.kernel_width, params.antialiasing] = ...
Error in imresize (line 141)
params = parseInputs(varargin{:});
Error in test_algorithm (line 25)
    Ic = imresize(Ic, scale, interpolation);

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Answer 1

David Sanchez 2014-6-17

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/134841-looping-over-function-string-arguments#answer_141327

在 MATLAB Online 中打开

In the second method you are passing a cell array as input argument.

Try this:

interpolation={'bilinear', 'bicubic'};
for k=1:numel(interpolation)
  for scale=1:4
    for image_idx={'01', '02', '03'}
      ...
      Iout = imresize(Iin, scale, interpolation{k});
      ...
    end
  end
end