inverse loop

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Arundhatee Talukdar 2011-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/21989-inverse-loop

编辑： Walter Roberson 2024-9-1

I want to use loop from i=180:1 and again next inserted loop j=180:1 Does matlab allow that? how I access (180,180) first rather then (0,0)...

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Amr 2016-10-12

sure ... use this command for i=180:-1:1 for j=180:-1:1

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回答（3 个）

Fangjun Jiang 2011-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/21989-inverse-loop#answer_28941

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for i=180:-1:1
  for j=180:-1:1

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Scott 2022-9-14

thanks

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Jan 2011-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/21989-inverse-loop#answer_28961

编辑：Walter Roberson 2024-9-1

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Whenever you have a problem with a specific command, be sure to read the help and doc text for this command:

help for

Step S with increments of -0.1

for S = 1.0: -0.1: 0.0, do_some_task(S), end

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Thomas 2011-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/21989-inverse-loop#answer_28943

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Try,

    for i=180:-1:1
      for j =180:-1:1
      i
      j
      end
    end

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Walter Roberson 2024-9-1

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The question @MH asked is about automatically inverting the order of two loops, without having to have a switch() statement. In one case in their example the loops are nested j within i, and in the other case the loops are nested i within j.

The answer to the question is "No, there is no dialog box or editor option to automatically reverse the nesting order. You would need something like

for outer = start:step:fin
    for inner = start:step:fin
        if ReverseLoop
            i = outer; j = inner;
        else
            i = inner; j = outer;
        end
        %code
    end
end