matlab/octave plot 一个网格

Question

t=0:0.01:2;
alpha=linspace(0, 1, 41);
r=linspace(0,1,41);
[aa,rr] = meshgrid(alpha,r);

At each point of (aa, rr), for each t there is a value t^aa+rr^2, then those values are summed up:

sum = (t1^aa+rr^2) + (t2^aa+rr) + ...

Thus for each point of (aa,rr), there is a number of sum. How do you plot that mesh?

Answer 1

You can reshape t into the third dimension to generate all triples of aa , rr and t via implicit expansion , and then sum over that dimension to get the desired result:

t3 = reshape(t, 1, 1, []);
s = sum(t3.^aa + rr.^2, 3);
mesh(aa, rr, s)

In your example, this produces