On 20 Oct 2005 at 11:09, Malcolm Clark wrote: > >I need a function which randomly takes a subarray of n elements from a > given array > > (where each element of the input array can only be once in the subarray). > > > One good idea which someone on this list suggested some time ago was to > swap the element that you have just found (by random (x), where x > indicates the number of elements in a zero-based array) with the last > element in the arraray and reduce x by one for the next time. This > changes the order of input data of course. Example code below.
Hi Malcolm, Great, very smart. That was exactly what I was looking for. Very smart to swap the already placed elements to the back of the array. I don't think the order of the input data is changed, because delphi makes a local copy of any open array parameter passed into a function. So the original input data is not changed. The requested array is not ordened of course, but that's no problem in my case. Thanks, Rinke _______________________________________________ Delphi mailing list -> [email protected] http://www.elists.org/mailman/listinfo/delphi
