c# - Generate Two Arrays of Non-Duplicate Numbers -


i have following code generates 2 non-duplicates arrays of integers based on ratio. codes works 4000 line file, takes time.

//train & test numbers int train = (int)(((double)settings.default.trainingratio / 100) * inputlines.count()); int test = inputlines.count() - train;  //train & test list random rnd = new random(); var trainlist = enumerable.range(1, inputlines.count()).orderby(x => rnd.next()).take(train).tolist(); var testlist = new list<int>(); (int = 1; <= inputlines.count(); i++) {     if (!trainlist.contains(i))         testlist.add(i); }

and worse, how read lines:

foreach (var n in trainlist) {     objdataintilizer.generatemasterlablefile(inputlines.skip(n - 1).take(1).first().tostring()); }

could advice way have better performance.

each time code calls inputfiles.count(), you're re-reading entire file, since file.readlines using deferred execution, , aren't materializing it. since need entire list in-memory anyway, use file.readalllines instead, returns string[] , has length property, o(1) operation instead of o(n).

then, instead of using list<int> trainlist, use hashset<int> faster lookup contains:

public static class enumerableextensions {     public static hashset<t> tohashset(this ienumerable<t> enumerable)     {         return new hashset<t>(enumerable);     } }  random rnd = new random(); var trainlist = enumerable.range(1, inputlines.length)                           .orderby(x => rnd.next())                           .take(train)                           .tohashset();  var testlist = new list<int>(); (int = 1; <= inputlines.length; i++) {     if (!trainlist.contains(i))         testlist.add(i); }

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