Displaying 1 result from an estimated 1 matches for "tp1561932p1564724".
2010 Feb 19
4
Accessing values of a matrix
hello all,
thank you for taking the time
I have a matrix A that have column names (let say n columns), I want to
reduce the matrix to have just a few of those column (p colums, this is
trivial), but for the lines I want only the lines such that A(i,J) is part
of a list (J is fixed and known)
I am sure it is very easy but I don't find it (I tryed which but it doesn't
seem to work)
Surely