How do i resolve this error

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Olufemi Ologun
Olufemi Ologun 2022-1-17
评论： Rik 2022-1-17
Error using .*
Matrix dimensions must agree.
Error in phdegmninvert (line 97)
up=-(fftbou.*(exp((z0*100000)*(frequencytotal.*(1/100000)))));

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回答（2 个）

Max Heimann
Max Heimann 2022-1-17
编辑：Max Heimann 2022-1-17
Try turning the multiplication in the middle into an elementwise multiplication aswell.
Also, the last multiplication probably shouldnt be elementwise since you are multiplying with a scalar value
up=-(fftbou.*(exp((z0*100000) .* (frequencytotal*(1/100000)))));
If that does not work, we would need more information about the dimensions of the multiplied elements.
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Olufemi Ologun
Olufemi Ologun 2022-1-17
Thank you for the response.
I tried it but still given same error

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Rik
Rik 2022-1-17
Ran in:
You can resolve this error by making sure the dimensions agree.
If you think this answer is unhelpful; it is. If you want a more helpful answer you will have to provide more details.
An element-wise multiplication will work if isequal(size(A),size(B)). If non-matching dimensions are of length 1 and you are using R2016b or later, implicit expansion will cause expansion into an array:
A=rand(1,3);
B=rand(4,1);
size(A.*B)
ans = 1×2
4 3
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Olufemi Ologun
Olufemi Ologun 2022-1-17
still need advice.
thank you
Rik
Rik 2022-1-17
Is that the size, or the content? If it is the latter there should be no issue (except maybe what Max already wrote about the * instead of .*). If the former, how do you expect Matlab to multiply them? What should be the result of this?
[1 2;3 4].*[1 2 3;4 5 6;7 8 9]

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