How do you circshift progressive rows an increasing amount?

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David Hyatt 2020-11-23

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评论： David Hyatt 2020-11-25

采纳的回答： Rik

If I have a matrix:

[nan nan nan nan nan]

[ 1a nan nan nan nan]

[ 1b 2b nan nan nan]

[ 1c 2c 3c nan nan]

[ 1d 2d 3d 4d nan]

I want to change it to this:

[ 1a 2b 3c 4d nan]

[ 1b 2c 3d nan nan]

[ 1c 2d nan nan nan]

[ 1d nan nan nan nan]

[nan nan nan nan nan]

I tried:

for K = 1:length(A)

A = circshift(A(:,K),K);

Thank you.

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David Hyatt 2020-11-24

It was going slow because of missing semicolons. Oops. I'm not sure how to turn your solution in to code to try. If you would like to provide a sample I will try it out. The code I made does the 400x400 matrix in about a second for reference.

Rik 2020-11-24

I have edited my answer to include the edit I meant. Dynamically growing an array is a bad idea, as mlint is warning you. You should make it a habit of resolving every mlint warning. Either suppress them (right-click and select suppress warning on this line), or change the code.

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采纳的回答

Rik 2020-11-23

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编辑：Rik 2020-11-24

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You need to index a column in A in your output as well.

for K = 1:size(A,2)
   A(:,K) = circshift(A(:,K),K);
end

If you want to move every NaN to the bottom, you can also use the sort function.

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David Hyatt 2020-11-25

Thank you for the help and explanation!

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MATLAB Language Fundamentals Loops and Conditional Statements

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