How to divide a matrix by certain numbers?

Question

Royvg94 2015-9-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/244657-how-to-divide-a-matrix-by-certain-numbers

评论： Star Strider 2015-9-23

采纳的回答： Star Strider

I want to divide a matrix by a column vector in this way:

(4 2 3 8;7 9 1 5;6 4 8 3) / (4;8;2)

and then the result i want to get is:

(4/4 2/4 3/4 8/4;7/8 9/8 1/8 5/8;6/2 4/2 8/2 3/2)

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Answer 1

Star Strider 2015-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/244657-how-to-divide-a-matrix-by-certain-numbers#answer_193440

在 MATLAB Online 中打开

Try this:

A = [4 2 3 8;7 9 1 5;6 4 8 3];
B = [4;8;2];
format rat
Q = bsxfun(@rdivide, A, B)
Q =
       1              1/2            3/4            2       
       7/8            9/8            1/8            5/8     
       3              2              4              3/2

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Royvg94 2015-9-23

What means format rat? And what does it do?

Star Strider 2015-9-23

The format rat sets the format in the Command Window to rational fraction approximation, since I thought that is what you wanted. (See the documentation on format for a full description of that and other options.) This just affects the Command Window output, and full double-precision representation is maintained internally.

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