creating a function getting the graident and passing variables to them
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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 个评论
Geoff Hayes
2019-3-11
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?
采纳的回答
Alex Mcaulley
2019-3-11
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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