Need half of my contour plot

Question

Maryam 2013-7-18

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Hello I have a contour of the pressures over a surface. Basically, I had vectors x and y which were locations on the surface and on each location, I had a value for pressure. I have a rectangular plot. I was wondering if there is a way to split my plot from the diagonal and show just the results for either upper or lower triangles?

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Answer 1

Kye Taylor 2013-7-18

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编辑：Kye Taylor 2013-7-18

在 MATLAB Online 中打开

Check out the tril and triu functions. For example if you have data similar to

[x,y]= meshgrid(-1:.05:1);
z = x.^2+y.^2;
contour(x,y,z)

Try something like

zLowerTri = tril(z);
contour(x,y,zLowerTri)

Since contour plots with the origin at lower left instead of upper right, you may prefer either

zLowerTri = tril(z);
contour(x,y,zLowerTri)
axis ij

or

contour(x,y,fliplr(tril(fliplr(z))))

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Pourya Alinezhad 2013-7-19

use "nan" as i mentioned below to make that part invisible... functions you use {ex:tril(z)} replace the data values with zero,which itself could be a data!!!

Maryam 2013-7-19

Thank you very much. I now have what I wanted.

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Answer 2

Pourya Alinezhad 2013-7-18

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编辑：Pourya Alinezhad 2013-7-18

在 MATLAB Online 中打开

hello maryam, run following lines of code.

x=0:0.1:10;
  y=x;
  j=1;
  z=meshgrid(x,y);
  h=ones(length(x),length(x))*nan;
  for i=1:length(x)
      for j=1:length(y)
      if i>j
          h(i,j)=z(i,j);
      end
      end 
  end
  surf(sin(h)./sqrt(h))
  figure
  contourf(sin(h)./sqrt(h))