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plot a function in 3D

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Dimitris
Dimitris 2011-8-12
I have variables a and b both defined in [-1,+1] and the function c = a / (a + b)
How can I plot c in 3D to visualize the function?

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Walter Roberson
Walter Roberson 2011-8-13
RESOLUTION=20; %increase this for a finer grid
t = linspace(-1,1,RESOLUTION);
[a,b] = ndgrid(t,t);
c = a./(a+b);
surf(a,b,c);
It is, however, not possible to plot it as a continuous surface, as your graphics display only has discretized output locations ("pixels").
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bym
bym 2011-8-13
why do you think it does not look correct?
Dimitris
Dimitris 2011-8-14
it is correct. the resolution is too coarse and confused me. thanks for your help.

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bym
bym 2011-8-12
a= rand(10,1)*2-1
b=rand(10,1)*2-1
c=a./(a+b)
scatter3(a,b,c)
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Dimitris
Dimitris 2011-8-12
thanks, but can I plot it as a continuous surface. For all values, not just random samples?

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