0 个投票

I have two fucntions with identical independent variable x. I need to draw a 2D contour plot for that two fucntions. But my code is not runnig. Pl somebody help me.
syms x
y1=x^.3+x+1;
y2=4.*x.^2;
x=linspace(0,5,30)
[X]=meshgrid(x);
F1=y1(X);
F2=y2(X);
contourf(F1(X), F2(X))
This code is not runnig. I need to get a filled contour with F1 and F2.

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Walter Roberson
Walter Roberson 2020-5-13

0 个投票

Guessing about what you might maybe mean:
syms x
y1(x)=x^.3+x+1;
y2(x)=4.*x.^2;
x=linspace(0,5,30);
[X]=meshgrid(x);
F1=y1(X);
F2=y2(X);
subplot(1,2,1)
contourf(x, x, F1);
title('y1')
axis equal
subplot(1,2,2)
contourf(x, x, F2);
title('y2')
axis equal

5 个评论
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AVM
AVM 2020-5-13
@walter: Thanks for your reply. But I need to draw the 2D contour by allowing y1 as the vertical axis( y axis) and y2 along horizontal axis(x axis).
Walter Roberson
Walter Roberson 2020-5-13
If you do that... then what is the z value? Contours require different values of z
AVM
AVM 2020-5-13
can I consieder X as Z in that case?
AVM
AVM 2020-5-13
编辑：AVM 2020-5-13
Actually I need to see as x changes, then what is corresponding chages of y2 as y1 will be changing. I need to know the behaviour of y2 as y1 changes from a 2D contour plot.
Walter Roberson
Walter Roberson 2020-5-13
Actually I need to see as x changes, then what is corresponding chages of y2 as y1 will be changing.
All I can think of that you might mean for that would be like
dy1 = diff(y1);
dy2 = diff(y2);
fplot(dy2-dy1, [0 5])
Your y1 and y2 are each single dimensional; there is no reason to be using meshes and contour plots with them.

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