Hello all,
I have not been able to find an answer to this problem. I feel like it might
be so simple though that it might not get a response.
Suppose I have a dataframe like the one I have copied below (minus the
'calib' column). I wish to create a column like calib where I am subtracting
the 'Count' when 'stain' is 'none' from all other 'Count' data for every
value of 'rep'. This is sort of analogous to putting a $ in front of the
number that identifies a cell in a spreadsheet environment. Specifically I
need some like this:
mydataframe$calib <- Count - (Count when stain = none for each value rep)
Any thoughts on how I might accomplish this?
Thanks in advance.
Sam
Note: I've already calculated the calib column in gnumeric for clarity.
rep Count stain calib
1 1522 none 0
1 147 syto -1375
1 544.8 sytolec -977.2
1 2432.6 sytolec 910.6
1 234.6 sytolec -1287.4
2 5699.8 none 0
2 265.6 syto -5434.2
2 329.6 sytolec -5370.2
2 383 sytolec -5316.8
2 968.8 sytolec -4731
3 2466.8 none 0
3 1303 syto -1163.8
3 1290.6 sytolec -1176.2
3 110.2 sytolec -2356.6
3 15086.8 sytolec 12620
--
*****************************************************
Sam Albers
Geography Program
University of Northern British Columbia
3333 University Way
Prince George, British Columbia
Canada, V2N 4Z9
phone: 250 960-6777
*****************************************************
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