Advanced Search

Question: return a list of indices that match a condition

Question:return a list of indices that match a condition

casperyc 962 Maple 18
July 25 2014
2

a:=Vector([2,3,4,5]);

select[flatten](x->x>=3,a);

This returns a Vector that satisfies the above condition. What's the most efficient way to get the indices of those entries?

For example, a list l:=[2,3,4] that correspond to the a[l] entries that satisfies the above condition.

l:=[2,3,4];

a[l]; # gives the same answer

 

Thanks,

 

casper
Please Wait...