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Which approach is useful here to get a plot?

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Trim Dim
Trim Dim 2022-12-1
评论： Trim Dim 2022-12-2
I have this function with two input parameters
I'm used to graphing functions with a single parameter.
But how can you get an output with two parameters?
How will it be passed to the function if I create two arrays
for each input parameter? I'd want to have input in the
range [0,1]. Is there another example?

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KSSV
KSSV 2022-12-1
Check and then use. I have quickly typed it without much thought.
n1 = linspace(0,1) ;
n2 = linspace(0,1) ;
n = cat(3,n1,n2) ;
% First summation
T1 = zeros(size(n1)) ;
for i = 1:2
T1 = T1 + -1/2*n(:,:,i)+1/4*n(:,:,i).^4 ;
end
% Second summation
for i = 1:2
T2 = n(:,:,i).^2 ;
for j = 1:2
if j ~= i
T2 = T2.*n(:,:,j).^2 ;
end
end
end
iwant = T1+T2 ;
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KSSV
KSSV 2022-12-1
Ran in:
Perfect..
n1 = linspace(0,1) ;
n2 = linspace(0,1) ;
[n1,n2] = meshgrid(n1,n2) ;
n = cat(3,n1,n2) ;
% First summation
T1 = zeros(size(n1)) ;
for i = 1:2
T1 = T1 + -1/2*n(:,:,i)+1/4*n(:,:,i).^4 ;
end
% Second summation
for i = 1:2
T2 = n(:,:,i).^2 ;
for j = 1:2
if j ~= i
T2 = T2.*n(:,:,j).^2 ;
end
end
end
iwant = T1+T2 ;
surf(n1,n2,iwant)
Trim Dim
Trim Dim 2022-12-2
Although the output is very similar but in the expected output
(as in my attachment) there is a bump in the center
and the edges show minima at n1=1 and n1=0 and also at
n2=1 and n2=0.

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