Dear all,

I have a matrix which values varying from 1 to 5.
I also have a table with a column that match with matrix values (=my.id).

my.matrix<-matrix(sample(1:5,100,replace=T),nc=10)
image(my.matrix)

my.df<-data.frame(cbind(my.id=1:5,my.value=c(0.1,0.3,0.2,0.9,1)))
my.df

How can I create a new matrix, where the values of this matrix is my.value when the value of my.matrix match with my.df$my.id

I can do it in a for() looping, but my matrix are so big (2000 x 2000) and I need to it about 1,000 times.

Thanks in advance,

Miltinho



 para armazenamento!

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