Insert multidimensional array into function handle

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!

Answer 1

[Steven Lord]

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 = 

[Sinipelto]

Thank you, this is more elegant solution I was trying to achieve first.

Answer 2

[Sinipelto]

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.