[R] Help with loop

paulalou pls28 at medschl.cam.ac.uk
Wed Jul 11 16:11:22 CEST 2012


I have two dataframes:

The first, df1, contains some missing data:

   cola colb colc cold cole
1    NA    5    9   NA   17
2    NA    6   NA   14   NA
3     3    NA   11   15   19
4     4    8   12   NA   20

The second, df2, contains the following:

  cola colb colc cold cole
1  1.4  0.8 0.02  1.6  0.6

I'm wanting all missing data in df1$cola to be replaced by the value of
df2$cola. Then the missing data in df1$colb to be replaced with the
corresponding value in df2$colb etc.

I can get this to work column by column with single input lines but as my
original dataset is a lot larger I'm wanting a create a loop but can't work
out how.

The single line command is:


I've tried a replace function within a loop but get error messages:


for (i in list) {

with error messages of:

Warning messages:
1: In is.na(mymat$snp) :
  is.na() applied to non-(list or vector) of type 'NULL'

Can anyone help me with this?


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