trying to multiply and divide different size matices

Question

A Poyser 2023-5-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1970359-trying-to-multiply-and-divide-different-size-matices

评论： FannoFlow 2023-5-22

采纳的回答： Image Analyst

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I am trying to make sense of this line

cdp = cdp_initial + cdp_increment * (sigma_range / KIc) * N_cycles;

However, the matrix for sigma_range is 1x11. However KIc, and N_cycles are both 6x6

Is there a logical way to perfrom this operation?

Thanks in advance

Alex

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Adam Danz 2023-5-22

编辑：Adam Danz 2023-5-22

When you see a size mismatch like this, three possible explanations come to mind

something is wrong with the size of the data in the inputs
the variables are being computed incorrectly
the variables and computations are fine but the line of code is not correct

Where I would start troubleshooting depends on context. If lots of others have used this code without problems and it comes from a reputable source, I'd start with #1, assuming I screwed up the inputs.

If I wrote the code yesterday after losing sleep for 3 days and was suspicious that gnomes may have messed with my code, I'd start with #3 after checking that the inputs make sense.

If you confirmed that the code is not the problem and your inputs are correct, then start with #2.

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Answer 1

Image Analyst 2023-5-22

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https://ww2.mathworks.cn/matlabcentral/answers/1970359-trying-to-multiply-and-divide-different-size-matices#answer_1241709

Not that I know of. It throws an error, right? Can't you ask the original author what their thinking was?

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A Poyser 2023-5-22

yes it generates an error

FannoFlow 2023-5-22

A possible "solution" could be to multiply the 6x6 each by the 1x11, generating a 6x6x11 matrix.

You'd do this by reshaping the 1x11 matrix to a 1x1x11 matrix reshape(data, 1,1,[]) and then multiplying.

After that, I'm not sure. perhaps this is inteded to be used in some sort of mean? Either way you need to sort out the logic and intent behind the program here before moving forward.

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