[R] Multiple if function

Peter Alspach Peter.Alspach at plantandfood.co.nz
Tue Sep 15 21:23:02 CEST 2015

Tena koe Maria

It seems you need to multiply Flow by 0.05+ASBClass/20 (i.e., no if calls are necessary)

HTH ....

Peter Alspach

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Maria Lathouri
Sent: Tuesday, 15 September 2015 10:57 p.m.
To: r-help at r-project.org
Subject: [R] Multiple if function

Dear all, 

I am writing as I would like your help. I have a dataframe with two columns, ASB and Flow, where the the first one has values 1, 2 or 3 and the second flow data. Something like that:
ASBclass    Flow1              11.51               9.2
2              10.5
3               6.7  ...              ...
I would like to produce a third column named eg. deviation where it would get me values based on if ASBclass is 1, multiply Flow by 0.1; if ASBclass is 2 then multiply Flow by 0.15 and if ASBclass is 3 then multiply by 0.2.

If (ASBclass=1) { deviation<-Flow*0.1}
If (ASBclass=2) { deviation<-Flow*0.15}If (ASBclass=1) { deviation<-Flow*0.2} I am not sure whether I should add the else function and how can I combine these separate functions.

Can anyone help me on that?
Thank you very much. 

Kind regardsMaria

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