Write values in new matrix and mirror values with symmetry axis

Question

wswur 2017-6-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/345007-write-values-in-new-matrix-and-mirror-values-with-symmetry-axis

回答： Ankita Nargundkar 2017-6-22

This is the case: In an script (not shown here) I generate a quadrant of an ellipse in a matrix, filled up with values (to create a 3D shape). I try to mirror this quadrant in a new matrix to obtain the complete ellipse, based on symmetry axis. Below my script is shown, but I don’t get it completely working. The only thing that works is copying the quadrant shape to the new matrix, starting in the centre of that matrix instead of position (1,1) as the original matrix does. But the quadrant gets copied with a single values, while instead the original quadrant exists of multiple different values. The first part scans the original matrix with the quadrant starting in position (1,1) and copies the values to a new matrix.

I hope someone can help me out!

 for ii = 1:length(sigma_contact(:,A))             %old matrix
  for jj = 1: length(sigma_contact(B,:))         %old matrix
    if sigma_contact(round(ii),round(jj)) > 0   
      for x = 50 : length(complete_ellipse(1,:))
                            for y = 50 : length(complete_ellipse(1,:))
                                complete_ellipse(x,y) = sigma_contact(ii,jj) ; %swrite matrix values in new matrix
                            end
                        end 
                else
                    %do nothing / next row
    end
  end
end
for i = A:length(complete_ellipse(A,:))                %till symmetry axis
  for j = B: length(complete_ellipse(B,:))       %till symmetry axis 
    for x = 1:A                                 %begin in row till A
      for y = B:length(complete_ellipse(B,:)) %from row B till end
                             complete_ellipse(x,y) = complete_ellipse(ii,jj) %left lower quadrant
                             complete_ellipse((A-x),(B-y)) = complete_ellipse(ii,jj) %left upper quadrant
      end  
                end
                %right upper quadrant
                for x = 1:A
      for y = 1:B
                complete_ellipse(x,y) = complete_ellipse(i,j)
                         end
                end
           end
end

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Answer 1

Ankita Nargundkar 2017-6-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/345007-write-values-in-new-matrix-and-mirror-values-with-symmetry-axis#answer_271580

If you can find the center you can replicate it easily, Also try to find the equation. Also if you have curve fitting toolbox u can use it to fill the ellipse