Insert multidimensional array into function handle

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Sinipelto
Sinipelto 2021-3-23
评论： Sinipelto 2021-3-23
Hi,
I'm trying to solve a symbolic var from a function f(x,y), that should take pairs (x,y) as input.
However, MATLAB does not accept the array as input to a function handle to calculate them as a result array.
My code:
syms c
o = [ c 0 0; c 0 2; c 1 1; c 1 2; c 2 2; c 2 3; c 3 0; c 3 1; c 3 2; c 3 3 ]
f = @(c,x,y) c*(x+y)
eq = sum(arrayfun(f, o)) == 1 % ERROR FROM arrayfun() -> doesnt understand the multidim array input
solve(eq, c)
Gives this error:
"Not enough input arguments.
Error in @(c,x,y)c*(x+y)".
Thanks in advance!

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采纳的回答

Steven Lord
Steven Lord 2021-3-23
Ran in:
syms c
o = [ c 0 0; c 0 2; c 1 1; c 1 2; c 2 2; c 2 3; c 3 0; c 3 1; c 3 2; c 3 3 ];
f = @(c,x,y) c.*(x+y); % Use element-wise multiplication
V = f(o(:, 1), o(:, 2), o(:, 3))
V = 
solve(sum(V) == 1, c)
ans = 

更多回答（1 个）

Sinipelto
Sinipelto 2021-3-23
I solved this myself.
The arrayfun(..) can take multiple arrays as inputs. Thus, I had to split up the arrays to individual single dimensional arrays and then pass all of them into the function, like this:
syms c
oc = [ c c c c c c c c c c ]
ox = [ 0 0 1 1 2 2 3 3 3 3 ]
oy = [ 0 2 1 2 2 3 0 1 2 3 ]
f = @(c,x,y) c*(x+y)
eq = sum(arrayfun(f, oc, ox, oy)) == 1
solve(eq, c)
And we get: ans = 1/34.

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