Apply a callback to an array: Difference between revisions

=={{header|GNU Octave}}==

Almost all the built-in can operate on each element of a vector or matrix; e.g. sin([pi/2, pi, 2*pi]) computes the function sin on pi/2, pi and 2*pi (returning a vector). If a function does not accept vectors/matrices as arguments, the <tt>arrayfun</tt> can be used.

<lang octave>function e = f(x, y)

e = x^2 + exp(-1/(y+1));

endfunction

% f([2,3], [1,4]) gives and error, but

arrayfun(@f, [2, 3], [1,4])

% works</lang>

(The function <tt>f</tt> can be rewritten so that it can accept vectors as argument simply changing operators to their dot ''relatives'': <code>e = x.^2 + exp(-1 ./ (y.+1))</code>)