On Thu, 20 Mar 2003, Mmarques INESC wrote:
Hi all.
I do not know if it is a bug in the windows version but i have this
problem.
Reading a file with 20 rows, 2 columns and transforming into a
20 x 2 matrix.
If I try to find an element by using the which command which gives
some
It 'unwraps' the 200,000 x 2 matrix into a vector with 400,000
elements and giving you the location/subscripts of this vector that
matches the criterion. Instead you should use
apply(mat1, 2, function(y) which( y == 2 ))
which gives you the rows in each column that corresponds to 185.
