
Hi,

I am trying to get the positions in array coordinates (needed later) of certain elements in an array but I am not sure how to get them.

My array is Q and the condition is dt>dV, where dt and dV are arrays of exactly the same dimensions as Q.

I know that I can extract the elements of Q by using Q[dt>dV] but I need the array position of where this happens.

I don't see how to use the which() command since some elements given by that the condition are not unique 
( I tried which(Q==Q[dt>dV] ,arr.ind=TRUE) but that gives me too many positions plus
Warning message:
In Q == Q[dt > dV] :
  longer object length is not a multiple of shorter object length)

Any help would be really appreciated!

-Ralph


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