for if matrix

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Amit 2012-2-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/28001-for-if-matrix

编辑： Andreas 2013-9-30

for i=1:n-1
    for j=1:n-1
        for r=1:332
            if i + r  > 333
              data(i+r,:)=0;
                    *else if i-r = < 0
                            data(i-r,:)=0;*
                            else if j+r > 333
                                    data(:,j+r)=0;
                                     else if j-r = < 0
                                            data(:,j-r)=0;
                                         end
                                end
                          end
            end
          end
      end
  end

Please tell me how I can correct the error at i-r = < 0

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Jan 2012-2-4

Which error?

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采纳的回答

Walter Roberson 2012-2-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/28001-for-if-matrix#answer_36303

Change the '= <' to '<=' (without the apostrophes.)

http://www.mathworks.com/help/techdoc/ref/le.html

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Walter Roberson 2012-2-4

Your line s=s+data(i+r,j)+data(i-r,j) is outside of any of your "if" tests, so it is going to always be executed. It will cause a problem if i-r is 0 or negative.

Amit 2012-2-4