Hello R users
I would like to ask if anyone knows a computationally fast solution to this problem:
I have an original matrix and an index matrix. The original matrix is ca 4000x4000 cells, and the index matrix has 261 unique values. From these, I want to produce a new matrix.
Consider the following simplified example:
Original matrix 1 4 6 5 3 4 8 5 2 4 7 8 9 8 3 6
index matrix 1 5 2 7 3 2 4 5 5 3 6 7 7 5 8 3 9 9
my current code is something like this
for(i in 1:9) { changeVal <- which(originalMat==indexMat[i,1]) finalMat <- indexMat[i,2] }
replace(originalMat, indexMat[,1], indexMat[,2])
Uwe Ligges
the output would look like this:
Final matrix 5 5 7 3 2 5 3 3 7 5 5 3 9 3 2 7
At the moment it takes a while to process. Does anyone have any suggestions?
reagrds
Robert
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