[R] Slow update(insert) on Data.frame

[Joel]

Hi 

When I try to update an number in a large data.frame by its pos It's really
slow it take almost a sec to do this and I wonder why and if where is any
faster way to update a number in a data.frame

ive tried

DF$col[POS]<-number
DF[xPOS,yPOS]<-number

Thx
//Joel
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