[R] applying a function to data frame columns

From: dxc13 <dxc13_at_health.state.ny.us>
Date: Thu, 21 Feb 2008 13:57:31 -0800 (PST)


I want to apply this function to the columns of a data frame:

u[u >= range(v)[1] & u <= range(v)[2]]

where u is the n column data frame under consideration and v is a data frame of values with the same number of columns as u. For example,

v1 <- c(1,2,3)
v2 <- c(3,4,5)
v3 <- c(2,3,4)

v <- as.data.frame(cbind(v1,v2,v3))
uk1 <- seq(min(v1) - .5, max(v1) + .5, .5)
uk2 <- seq(min(v2) - .5, max(v2) + .5, .5)
uk3 <- seq(min(v3) - .5, max(v3) + .5, .5)

u <- do.call("expand.grid", list(uk1,uk2,uk3))

Here, there are 3 columns; instead of hard-coding this, can the function given above, which will restrict the u data frame to values within the ranges of each variable, be done with the apply function? Thanks in advance.


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Received on Thu 21 Feb 2008 - 22:48:25 GMT

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