[R] Re place values matrix

start python_it at hotmail.com
Tue Nov 18 17:15:52 CET 2008

To replace particular values in a matrix we can use the following command.

matrix[x,y] = value

But what to do if I have a list of +- 1,000,000 values and associated x,y
Is there an efficient way to replace my matrix with those values.

My first idea was to replace x, y and values by vectors.......but that
doesn't work.
Value in this case can't be a vector :(. It results in a wrong replacement.
It takes the last value of the matrix.........

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