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Contour plot

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Green Sal
Green Sal 2011-10-20
Hello.
I have the functions of normal strain,x = 3 + 12*x^2+6*y^2 normal strain,y= x shear strain,xy= 12*x*y+y-14*x
and i would like to plot the contours of the three equations where x and y is between -1 and 1. So from the graph i can tell where is the max of each.
Please Help.
Thank you.

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the cyclist
the cyclist 2011-10-20
Does this help?
x = -1:0.01:1;
y = -1:0.01:1;
[xx,yy] = meshgrid(x,y);
nsx = 3 + 12*xx.^2+6*yy.^2;
nsy = xx;
ss = 12*xx.*yy + yy - 14*xx;
figure
subplot(3,1,1),contour(xx,yy,nsx)
subplot(3,1,2),contour(xx,yy,nsy)
subplot(3,1,3),contour(xx,yy,ss)

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