Error using reshape To RESHAPE the number of elements must not change.

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pallavi singh 2021-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/857465-error-using-reshape-to-reshape-the-number-of-elements-must-not-change

评论： Walter Roberson 2021-6-19

can anyone tell me where is the error?

yw=Eband;
k=NoOfBands;
xrtemp=reshape(Eband(k),1,S(1,1)*S(1,2));  
k=k-1;
for i=2:size(S,1)-1
   xrtemp=[xrtemp reshape(Eband(k-1),1,S(i,1)*S(i,2)) reshape(Eband{k},1,S(i,1)*S(i,2)) reshape(Eband{k-2},1,S(i,1)*S(i,2))];
   k=k-3;
end
DImg=(waverec2(xrtemp,S,wname));
nl_mnt=im_nl+DImg;
nl_mnt8=uint8(nl_mnt);
toc

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回答（1 个）

Walter Roberson 2021-6-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/857465-error-using-reshape-to-reshape-the-number-of-elements-must-not-change#answer_725945

编辑：Walter Roberson 2021-6-16

在 MATLAB Online 中打开

k=NoOfBands;

That has the appearance of being a scalar.

xrtemp=reshape(Eband(k),1,S(1,1)*S(1,2));

We do not know what Eband is. If it is numeric or cell, then if k is a scalar then Eband(k) would be a scalar. You would then be attempting to reshape a scalar to be 1 by something, but that something does not look likely to happen to exactly equal 1.

If Eband is a function, then the previous like

yw=Eband;

would have been an invocation of the function without passing in any parameters. It could work and still have Eband(k) work, but it is not obvious that it will.

If Eband is the handle to a function, then the assignment to yw would be assigning a copy of the handle, and Eband(k) would be invoking the function. We cannot rule it out.

But let us look at

   xrtemp=[xrtemp reshape(Eband(k-1),1,S(i,1)*S(i,2)) reshape(Eband{k},1,S(i,1)*S(i,2)) reshape(Eband{k-2},1,S(i,1)*S(i,2))];
   

and notice that Eband{k} and Eband{k-2} are referenced. Those are cell array references. We can then guess that the code you wanted was

xrtemp=reshape(Eband{k},1,S(1,1)*S(1,2));

If so that could also be written as

xrtemp = Eband{k}(:).';

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pallavi singh 2021-6-19

xrtemp =

Columns 1 through 10

-10.5347 24.4846 5.8826 -6.6274 40.2777 49.4878 -38.7338 -35.6576 -14.1041 37.4271

Columns 11 through 13

51.4417 -21.5861 20.4357

S =

32 32

64 64

128 128

256 256

512 512

Walter Roberson 2021-6-19

nl = S(1,1) = 32, nc = S(1,2) = 32, and there are not at least 3 columns in the S matrix.

In this configuration, the code expects to be reconstructing a 32 x 32 signal, and so needs xrtemp to have at least 32*32 = 1024 entries. But xrtemp only has 13 entries.

The way you build xrtemp is not compatible with the S matrix you have.

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