How do you plot a surface in matlab?

2014 11 2
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I was trying the whole night to plot the surface described by x^2-y^2-z^2=1.....This program is sooo hard to use!! could anyone give a solution? Thanks a lot.

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Youssef Khmou
Youssef Khmou 2014-11-2

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There several tutorials that illustrate how to make a graph of f(x,y), here is simple example :
[x,y]=meshgrid(-1:0.1:1);
z=sqrt(1+x.^2+y.^2);
surf(x,y,abs(z))

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Yue Li
Yue Li 2014-11-2
Isn't this problematic? Because you are really missing the negative part of this graph....Also, may I ask how did you learn all this? I spent all night, and never made any progress of such....
Youssef Khmou
Youssef Khmou 2014-11-2
remove the absolute value >>surf(x,y,z). start by learning simple tutorials.

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