How do I create a for loop in MATLAB for this?

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Chloe Sim 2020-3-30

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评论： Walter Roberson 2020-4-29

Greeting everyone.

I have a these matrix: A is by the order of 10 by 3.

I want to do this calculation: B = (A-min(A))/[max(A)-min(A)]

After that I want B to be by the order of 10 by 3.

Is there a way where I can do a loop of this?

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Walter Roberson 2020-3-30

Sure. You can deliberately create a loop or two to find the max and min, and you can deliberately create a loop or two to rescale. You do not need to do those things, but you can.

The trick for the vectorized form is that by default max and min work over only one dimension of a multidimensional array. See the documentation for how to change that to process all dimensions.

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James Tursa 2020-3-30

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编辑：James Tursa 2020-3-30

在 MATLAB Online 中打开

If you want to use the overall min and max, then just use A(:) for the calculations. E.g.,

B = (A-min(A(:)))/[max(A(:))-min(A(:))];

A(:) is shorhand for reshaping the variable into a column vector.

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Chloe Sim 2020-4-29

Actually, I was guessing using loop will be the best option in the case. But I not sure, how to go about and do it.

Walter Roberson 2020-4-29

You can find the per-row min using min(A, [], 2) and you can find the per-row max using similar code. You can do the subtractions . But you should change the division from / to ./

The resulting expression should handle the entire matrix with no loops.

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