I need to increment cells of a matrix (collusionM). The indexes to increment
are in an index (matchIndex). This is some of the code
for (j in 1:(rows-1)) matchIndex[[j]] <- which(mx[j]==mx)
for (j in 1:(rows-1)) collisionM[j,matchIndex[[j]]] <-
collisionM[j,matchIndex[[j]]] + 1
I could put them in the same loop but this is slower. The first for statement
is fine. It finds the matches and creates a list of the matches. The second
is too slow, it increments the sparse matrix elements.
Let me know if I need to put in more complete code to make this understandable.
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