How to plot a 3D graph?
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I wrote a code to measure the temperature in terms of time and depth but when I plot my 3D graph, the temperature's values increased significantly from their 2D values and I would like to know why?
Here is my code:
alpha=0.128e-6;
Ts=-20; Ti=10;
t=linspace(0,2.592*10^6,75);
z=linspace(0,3,75);
T=(erf(z./(2*sqrt(alpha.*t)))*(Ti-Ts))+Ts;
[tt,zz]=meshgrid(t,z);
TT=tt.^2-zz.^2;
surf(zz,tt,TT);
xlabel('depth')
ylabel('time')
zlabel('temperature')
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Answers (1)
Chad Greene
on 6 Oct 2015
Edited: Chad Greene
on 6 Oct 2015
This isn't a problem with plotting, it's a problem with your data. See:
hist(TT(:))
Your TT matrix has some pretty big values in it, whereas your T matrix has values mostly in the range of -10 to 10 degrees.
Why aren't you calculating TT the same way you calculated T?
TT=(erf(zz./(2*sqrt(alpha.*tt)))*(Ti-Ts))+Ts;
3 Comments
Chad Greene
on 6 Oct 2015
Without any context it's hard to know what you mean by funky or what the surface should look like. Matlab's plotting the data you're giving it, so I can only assume the issue is with the data. Be descriptive about what's wrong with the surface above, and what you want it to look like.
Chad Greene
on 6 Oct 2015
Did you mix up the order of zz and tt when plotting? Try this:
pcolor(tt,zz,TT);
shading interp
xlabel('time')
ylabel('depth')
set(gca,'YDir','reverse')
cb = colorbar;
ylabel(cb,'temperature')
Note I opted for pcolor although surfaces look cool, they're rarely of great use for displaying scientific data.
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