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components of vector valued functions

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Wilhelm
Wilhelm 2014-2-3
评论： Wilhelm 2014-2-3
Given
F=@(x,y) [x+y,x-y.^2]
how do I refer to the second component of that function;
the command
syms x,y; F(x,y)(2)
gives an error, though I would expect to get x-y^2. My goal is to define a new function which only contains one particular component of a vector field like
f2=@(x,y) F(x,y)(2)
Probably simple but I did not find the correct syntax.

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采纳的回答

Walter Roberson
Walter Roberson 2014-2-3
VSelect = @(V,IDX) V(IDX);
F = @(x,y) [x+y,x-y.^2]
f2 = @(x,y) VSelect(F(x,y),2);
There is no good direct way to do it. There is a way to do it all in one function call, but it is somewhat ugly and not easy to read.

更多回答（1 个）

Wilhelm
Wilhelm 2014-2-3
编辑：Walter Roberson 2014-2-3
That gives
>> syms z
>> F(1,z)
ans =
[ z + 1, 1 - z^2]
in my example.
I want to define a new function handle however which yields the second component x-y^2 only (for my example).
Or did I misunderstood your answer?

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