HI,someone plz help

Error using horzcat Dimensions of matrices being concatenated are not consistent. Error in facedetection (line 39) S=[S,temp];

[EDIT]: code brought over from duplicate question

for i=1:M
  str=strcat('C:\Users\Dhanya Francis\Desktop\Project\',int2str(i),'.jpg');
  eval('img=imread(str)');
  subplot(ceil(sqrt(M)),ceil(sqrt(M)),i)
  imshow(img)
  if i==2
    title('Training set','fontsize',18)
  end
  drawnow;
  [irow,icol]=size(img);
  img(irow,icol) ;
  temp=reshape(img,irow*icol,1);
  S=horzcat(S,temp);
end

[Guillaume]

What is the point of the eval? When the same line without the eval would work just as well.

Answer 1

[Image Analyst]

What does this say

size(s)
size(temp)

Chances are, they don't have the same number of rows in them.

[Dhanya Francis]

ans =

     0     0

ans =

      387900           1

ans =

      387900           1

ans =

      359160           1

Error using horzcat Dimensions of matrices being concatenated are not consistent.

Error in new (line 39) S=[S temp];

[Image Analyst]

Yep, like I said. 387,900 rows in S and 359,160 rows in temp. Different number of rows so you can't stitch them side by side. You can do it vertically if you want with ;

S = [S; temp];

but I don't really know what you want to do because I haven't really gone over your code in your duplicate question in detail.

[Dhanya Francis]

It worked.Thanks alot..Stay blessed :)

Answer 2

[Star Strider]

I do not know your reason for concatenating your reshaped images. If you want to save them for some other purpose later in your code, I would just save them to a cell array (note the curly brackets ‘{}’:

S{i} = reshape(img,irow*icol,1);

Unless you need them in a matrix (that does not appear to be an option anyway considering their differing sizes), this will allow you to recall each one, and even save ‘S’ to a .mat file if you want, so you can just load them and do not (necessarily) have to repeat the loop each time you run your code.

And as Guillaume mentioned in his Comment, change:

eval('img=imread(str)');

to simply:

img=imread(str);

[Dhanya Francis]

Thank you :)

[Star Strider]

My pleasure.

How did you finally solve your problem?