Integers can only be combined with integers of the same class, or scalar doubles

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Neo
Neo 2015-12-22
编辑： DGM 2024-8-26
Error using - Integers can only be combined with integers of the same class, or scalar doubles.
Error in Code (line 27) data = data - repmat(mn,1,N);
Here is the code snip, where I am subtracting off the mean of some matrices:
mn = mean(data,2);
data = data - repmat(mn,1,N);
I tried casting the new data matrix to an int16 but that gave the same error, not sure what to cast it to, to avoid error.
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jgg
jgg 2015-12-22
编辑：jgg 2015-12-22
I added my answer below.
Are the matrices square? If they're not square, the * operator is matrix multiplication, if they're like NxM this is asking Matlab to do NxM * NxM which doesn't work. If you want to multiply them component-wise, the operator is .*.
See here for example.
jgg
jgg 2015-12-22
I think you should post another question to cover this, and give more background. I don't really understand what you're trying to do here, so you might want to explain very precisely what you're trying to accomplish, and what the objects you're working with are. (For instance, why are you trying to get the eigenvalues of a non-square matrix? Which operation made it non-square; it wasn't subtracting off the means.)

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采纳的回答

jgg
jgg 2015-12-22
编辑：jgg 2015-12-22
Try setting data = double(data) first.

更多回答（2 个）

sai kumar
sai kumar 2017-10-24
编辑：sai kumar 2017-10-24
i have the same problem please help me!!.
Error using mod
Integers can only be combined with integers of the same class, or scalar doubles.
Error in trial>decryption_Callback (line 457) m1(l)=mod(c2,n); code: c1=reshape(c,1,[]); s=numel(c1); m1=c1; c2=c1; for l=1:s c2(l)=c1(l)^msk; m1(l)=mod(c2,n); end
lokesh kumar
lokesh kumar 2020-6-24
编辑：DGM 2024-8-26
Error???????????????????????
%rough dark channel computation%
%a=imread('D:\Image processing project\image\hazy.jpg');
a=imread('D:\Image processing project\contrast\dark channel prior\dehaze_code\dehaze_code\inputImgs\forest_input.png');
[ht,wt,~]=size(a);
patchSize=15;
padSize=7;
JDark=zeros(ht,wt);
imj=padarray(a,[padSize padSize],inf);
for i=1:ht
for j=1:wt
patch=imj(i:(i+padSize-1),j:(j+padSize-1),:);
JDark(i,j)=min(patch(:));
end
end
atmSum=zeros(1,3);
imsize=ht*wt;
numpx=floor(imsize/1000);
JDarkVec=reshape(JDark,imsize,1);
ImVec=reshape(a,imsize,3);
[JDarkVec,indices]=sort(JDarkVec);
indices=indices(imsize-numpx:end);
atmSum=zeros(1,3);
for ind=1:numpx
atmSum=atmSum+ImVec(indices(ind),:);
end
A=atmSum/numpx;
figure;
imshow(uint8(A));
So what is the problem with the atmSum, it is not working. Anybody wants to solve this problem are always welcome.
or email me: lokesh.singh.in@gmail.com
Thanks
  1 个评论
DGM
DGM 2024-8-26
Since the intermediate sum will exceed the dynamic range of the original integer class, do the accumulation in float. This avoids mixed class arithmetic problems, and it avoids truncation.
ImVec = double(ImVec);

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