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Arbitrary sized function evaluation

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Daniel Wells
Daniel Wells 2011-11-3
x is an n-dimensional vector, and f is a function which takes in n variables. Is there a way to dynamically evaluate f so that the number of variables does need to be pre-specified? For example, I would like a single piece of code where if n equal three, would give me f(x(1), x(2), x(3)), and if n = 4, would give me f(x(1), x(2), x(3), x(4)). Any help on this matter would be greatly appreciated.

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Walter Roberson
Walter Roberson 2011-11-3
xt = num2cell(x);
f(xt{:});

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Jan
Jan 2011-11-3
This calls the function f with n scalar elements:
a = 1:4;
c = mat2cell(a, 1, ones(1, length(a)));
y = f(c{:});
Usually it is easier to let the function handle a vector as input. See e.g. sin:
y = sin(1:4)
Then y is a vector also. -Yes, I know this is trivial. But sometimes a programming problem is such impressing, that the programmer forgets the basics.

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