creating a function getting the graident and passing variables to them
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Nora Khaled
on 11 Mar 2019
Commented: Nora Khaled
on 11 Mar 2019
Hi !
I am trying to creat a function that I can both use to pass values and compute the gradient of that function.
I tried both these :
but the for the first I cant pass values and the 2nd the gradient function in matlab does not work
syms x1 x2
f= 100*(x2-x1^2)^2 + (1+x1)^2;
gr= gradient(f)
%%%%%% other way
syms x1 x2
f=@(x1,x2) 100*(x2-x1^2)^2 + (1+x1)^2;
gr= gradient(f)
2 Comments
Geoff Hayes
on 11 Mar 2019
Nora - please clarify what you mean by but the for the first I cant pass values and the 2nd the gradient function in matlab does not work. What do you mean by this? Are you observing errors? If so, what are they?
Accepted Answer
Alex Mcaulley
on 11 Mar 2019
Is this that you want?
syms f(x1,x2)
f(x1,x2)= 100*(x2-x1^2)^2 + (1+x1)^2;
gr(x1,x2) = gradient(f,[x1,x2])
Then you can compute
f(0,0)
gr(0,0)
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