Using a vector as an input for a function of multiple inputs in matlab

Question

I want to use a vector input such of dimension [m;1] in a function that takes in m number of inputs. For example:

syms x1 x2;

f = x1^2 + x2^2;
F = matlabFunction(f);
x = [1;1];
F(x);

The above code does not work because F is a function of 2 inputs and it only sees the vector x as a single input. I know I can say F(x(1),x(2)) and the above would work but I want it to work for a function of m variables and a vector of m length.

All help is appreciated. Thanks.

Possible duplicate of How can I pass a matrix vector into a function argument in matlab — sco1
– sco1, Commented Apr 26, 2016 at 20:37

Suever · Accepted Answer · 2016-04-26 20:29:33Z

3

You will want to first convert x to a cell and then pass it with {:}.

xcell = num2cell(x);
F(xcell{:});

Alternately, you can specify that you want x1 and x2 to be passed as an array when you call matlabFunction using the Vars parameter.

F = matlabFunction(f, 'Vars', {[x1, x2]});
F([1 1]);

answered Apr 26, 2016 at 20:29

Suever

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2 Comments

ktobrien Over a year ago

The top one worked beautifully. Thanks for the help and the quick response.

Suever Over a year ago

@ktobrien if this worked for you please consider marking it as a solution to help anyone with a similar question

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