Hi everyone,

I have large data frame, say df1,  with 165K columns, and all but the first
four columns of df1 are numeric.   I transformed the numeric data and
obtained a matrix, call it data.m, with 165K - 4 columns, and then tried to
create a second data frame by replacing the numeric columns of df1 by
data.m.  I did this in two ways, and both ways instantly used up all the
available memory, so I was wondering whether there was a better way to do
this.

Here's what I tried:

df2 <- df1
df2[ ,5:length(df1)] <- data.m

and

df2 <- cbind( df1[1:4], data.m)

Thanks,
David

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