ctranspose Transpose on ND array is not defined.

Question

sudha 2013-2-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/63150-ctranspose-transpose-on-nd-array-is-not-defined

face recognition program

% Acquire new image
% Note: the input image must have a bmp or jpg extension. 
%       It should have the same size as the ones in your training set. 
%       It should be placed on your desktop 
InputImage = input('Please enter the name of the image and its extension \n','s');
InputImage = imread(strcat('C:\Users\Sudha\Desktop\',InputImage));
figure(5)
subplot(1,2,1)
imshow(InputImage); colormap('gray');title('Input image','fontsize',18)
InImage=reshape(double(InputImage)',irow*icol,1); 
temp=InImage;
me=mean(temp);
st=std(temp);
temp=(temp-me)*ustd/st+um;
NormImage = temp;
Difference = temp-m;
    p = [];
  aa=size(u,2);
  for i = 1:aa
      pare = dot(NormImage,u(:,i));
      p = [p; pare];
  end
  ReshapedImage = m + u(:,1:aa)*p;    %m is the mean image, u is the eigenvector
  ReshapedImage = reshape(ReshapedImage,icol,irow);
  ReshapedImage = ReshapedImage';
  %show the reconstructed image.
  subplot(1,2,2)
  imagesc(ReshapedImage); colormap('gray');
  title('Reconstructed image','fontsize',18)
    InImWeight = [];
  for i=1:size(u,2)
      t = u(:,i)';
      WeightOfInputImage = dot(t,Difference');
      InImWeight = [InImWeight; WeightOfInputImage];
  end
    ll = 1:M;
  figure(68)
  subplot(1,2,1)
  stem(ll,InImWeight)
  title('Weight of Input Face','fontsize',14)
    % Find Euclidean distance
  e=[];
  for i=1:size(omega,2)
      q = omega(:,i);
      DiffWeight = InImWeight-q;
      mag = norm(DiffWeight);
      e = [e mag];
  end
    kk = 1:size(e,2);
  subplot(1,2,2)
  stem(kk,e)
  title('Eucledian distance of input image','fontsize',14)
    MaximumValue=max(e);
  MinimumValue=min(e);

the error is

??? Error using ==> ctranspose
Transpose on ND array is not defined.
Error in ==> Mio at 164
InImage=reshape(double(InputImage)',irow*icol,1);

plz help me solve this error...

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José-Luis 2013-2-12

编辑：José-Luis 2013-2-12

在 MATLAB Online 中打开

Do you seriously expect someone go through this? Actually you don't really need to go through all the code in this particular case. It helps if you post a minimum working example, it shows some effort from your part and you might discover what the problem is in the process of condensing it.

Please format your post.

Please learn to use the debugger, it will save you tons of time in the future.

doc dbstop

Please read the documentation.

doc ctranspose

The problem should become obvious then.

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Answer 1

Jan 2013-2-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/63150-ctranspose-transpose-on-nd-array-is-not-defined#answer_74732

编辑：Jan 2013-2-12

在 MATLAB Online 中打开

Ouch. It is strongly recommended to avoid unnecessary indirections like:

str = strcat(int2str(i),'.jpg');
eval('img=imread(str);');

This is faster, safer, cleaner and less weird:

img = imread(sprintf('%d.jpg', i));

I'd be so happy, if the crude and brute clearing whould vanish from the world of Matlab: clear all, close all, clc. This does not solve any problems, but wastes time and energy for reloading the function from the disk. At least clear variables should replace clear all.

The error message is very clear. In this line:

InImage = reshape(double(InputImage)',irow*icol,1);

the variable InputImage has more than 2 dimensions. Most likely it is a [X x Y x 3] RGB array and you want:

InImage = reshape(permute(double(InputImage), [2,1,3]), irow*icol, 3);

But I assume you will get further problems, when InImage is not a vector anymore, but a RGB matrix. Therefore something like rgb2gray might be useful.

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Walter Roberson 2013-2-13

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

Jan 2013-2-13

在 MATLAB Online 中打开

@sudha: Please try to find the relevant part of the code. It is not efficient to let the users of the forum do this for you.

In spite of this, a very short view on your ugly formatted code revealed:

[irow icol] = size(img);

If img is an RGB image, this fails. Better:

[irow, icol, iColor] = size(img);

or

irow = size(img, 1);
icol = size(img, 2);

But I assume your program can simply not handle RGB images, such that there might be a general weakness of the design. Please find out, to which kind of images your code is designed to.

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