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matlabfunctionmath
Pritam Bemis
Pritam Bemis

Reputation: 125

Matlab - how to build functions

Matlab has the function Legendre that returns to an integer m and real number r a vector of length m+1.

Now I want to define another function fun that gives me only the first component of this vector per fixed m, so I want to define a function fun(m,r) that gives me the first component of the vector legendre(m,x). The point is that fun(m,r) should also be a function, just like legendre. Does anybody know how to do this?

Upvotes: 0

Views: 127

Answers (1)

Luis Mendo
Luis Mendo

Reputation: 112659

Define the function as follows:

function out = fun(n,x)
temp = legendre(n,x); %// store output of "legendre" in a temporary variable
out = temp(1); %// return only desired element

Of course, this should be placed in a file fun.m within Matlab's path.

Alternatively, if you are feeling hackish, you can use

getfield(legendre(n,x), {1})

to extract the first element of legendre(n,x) directly (without a temporary variable). This allows defining fun as an anonymous function as follows:

fun = @(n,x) getfield(legendre(n,x), {1});

Upvotes: 3

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