How to find argument value?

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Ani Asoyan
Ani Asoyan 2020-6-14
评论： Ani Asoyan 2020-6-14
Hi, I have a, b vectors and rectangular grid made of them, I write a function and obtain function values on grid. How can I find which values of 'a' and 'b' vectors correspond to particuar function value? Here's the code...
a= [1,2]
b=[3,4]
[m,n]=ndgrid(a,b)
x=[m(:),n(:)]
u = @(a, b)(a.^2+b)
g=(u(x(:,1),x(:,2)).')
Code gives me g=4,7,5,8 values.... I want to know for example which values of 'a' and 'b' created g=7 value. Thanks.

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madhan ravi
madhan ravi 2020-6-14
编辑：madhan ravi 2020-6-14
mng = [m(:), n(:), g(:)];
ab_at_g = mng(ismember(mng(:,3),7),1:2)
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madhan ravi
madhan ravi 2020-6-14
It would give you the same result without ndgrid(...) ;)
Ani Asoyan
Ani Asoyan 2020-6-14
I didn't know that, but I'll learn more about it, thank you once again !!

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