Anonymous function of a series of nonlinear equations to accept vector input

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Jordan Duffy
Jordan Duffy 2023-9-21
评论： Star Strider 2023-9-21
Ran in:
I have a series of nonlinear equations, written as an anonymous function handle that outputs a vector solution of each function and Im trying to input a vector of x1,x2,x3. For the sake of the the error in my code I simplified it dramatically, however I cannot seem to get the function to output my desired results.
f= @(x1,x2,x3) [x1.^3;x2.^2;x3.^2]
f = function_handle with value:
@(x1,x2,x3)[x1.^3;x2.^2;x3.^2]
x=[1;1;1]
x = 3×1
1 1 1
f(x')
Not enough input arguments.

Error in solution>@(x1,x2,x3)[x1.^3;x2.^2;x3.^2] (line 1)
f= @(x1,x2,x3) [x1.^3;x2.^2;x3.^2]
"Invalid expression. When calling a function or indexing a variable, use parentheses.
Otherwise, check for mismatched delimiters"
  1 个评论
Dyuman Joshi
Dyuman Joshi 2023-9-21
Ran in:
The function you have defined expects 3 inputs -
f= @(x1,x2,x3) [x1.^3;x2.^2;x3.^2]
f = function_handle with value:
@(x1,x2,x3)[x1.^3;x2.^2;x3.^2]
But you have provided only 1 input, so it gives error
x=[1;1;1]
x = 3×1
1 1 1
f(x')
Not enough input arguments.

Error in solution>@(x1,x2,x3)[x1.^3;x2.^2;x3.^2] (line 1)
f= @(x1,x2,x3) [x1.^3;x2.^2;x3.^2]
I don't know how you about this error - "Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters"

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回答（1 个）

Star Strider
Star Strider 2023-9-21
Ran in:
Either:
f= @(x1,x2,x3) [x1.^3;x2.^2;x3.^2];
f = function_handle with value:
@(x1,x2,x3)[x1.^3;x2.^2;x3.^2]
x=[1;1.2;1.3];
x = 3×1
1.0000 1.2000 1.3000
f(x(1),x(2),x(3))
ans = 3×1
1.0000 1.4400 1.6900
or:
f= @(x) [x(1).^3;x(2).^2;x(3).^2];
f = function_handle with value:
@(x)[x(1).^3;x(2).^2;x(3).^2]
x=[1;1.2;1.3];
x = 3×1
1.0000 1.2000 1.3000
f(x')
ans = 3×1
1.0000 1.4400 1.6900
should work.
.
  2 个评论
Jordan Duffy
Jordan Duffy 2023-9-21
Thank you, it worked! The latter is what I was looking for as I was hoping to avoid manually inputting into f, so that the solver is general for any nonlinear equation input function handle.

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