On 2013-10-10, 16:04, bearophile wrote:
dominic jones:
I want to fill an array with random numbers without resorting to loops,
i.e. by doing something like the following, if it were possible:
fill!(function double(){ return uniform(0.0, 1.0);})(x[]);
Is there a simple way of doing this?
Generally it's a good idea to use only pure functions inside the higher
order functions of Phobos. using impure functions like uniforms could
lead to bugs or performance problems.
This is a way to do it (untested):
x.copy(x.length.iota.map!(_ => uniform(0.0, 1.0));
You've got the order wrong - copy takes first the source, then the target.
Also, is it faster to use .length.iota than simply mapping on x?
My solution:
x.map!(_=>uniform(0.0, 1.0)).copy(x);
--
Simen
