Re: [R] Multiple if function

> On 17 Sep 2015, at 01:42, Dénes Tóth wrote: > > > > On 09/16/2015 04:41 PM, Bert Gunter wrote: >> Yes! Chuck's use of mapply is exactly the split/combine strategy I was >> looking for. In retrospect, exactly how one should think about it. >> Many thanks to all for a

Re: [R] Multiple if function

On Thu, 17 Sep 2015, Berend Hasselman wrote: On 17 Sep 2015, at 01:42, Dénes Tóth wrote: On 09/16/2015 04:41 PM, Bert Gunter wrote: Yes! Chuck's use of mapply is exactly the split/combine strategy I was looking for. In retrospect, exactly how one should think about

Re: [R] Multiple if function

I think a more common idiom for the simpler case would be to use indexing vals <- c(0.1, 0.15, 0.2) mult <- vals[ASBclass] (However, some people are on the move to enforce mult <- vals[as.numeric(ASBclass)] because people who confuse factors and character variables get even more confused

Re: [R] Multiple if function

Hi, I guess this might work too and might be quite speedy: ASBclass = factor(c(1,2,2,3,2,1)) Flow = c(1,1,1,1,1,1) mult = ((ASBclass==1) * 0.1 + (ASBclass==2) * 0.15 + (ASBclass==3) * 0.2) deviation = mult * Flow or with the more complex arithmetic: deviation = ((ASBclass==1) * (Flow*2) +

Re: [R] Multiple if function

Yes! Chuck's use of mapply is exactly the split/combine strategy I was looking for. In retrospect, exactly how one should think about it. Many thanks to all for a constructive discussion . -- Bert Bert Gunter "Data is not information. Information is not knowledge. And knowledge is certainly

Re: [R] Multiple if function

I assume it's to return the vectors in their original order. -- Bert Bert Gunter "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." -- Clifford Stoll On Wed, Sep 16, 2015 at 2:10 PM, David Winsemius wrote: > > On Sep

Re: [R] Multiple if function

On Sep 15, 2015, at 7:20 PM, Charles C. Berry wrote: > On Tue, 15 Sep 2015, Bert Gunter wrote: > >> Thanks to both Davids. >> >> I realize that these things are often a matter of aesthetics -- and >> hence have little rational justification -- but I agree with The Other >> David: eval(parse)

Re: [R] Multiple if function

On 09/16/2015 04:41 PM, Bert Gunter wrote: Yes! Chuck's use of mapply is exactly the split/combine strategy I was looking for. In retrospect, exactly how one should think about it. Many thanks to all for a constructive discussion . -- Bert Bert Gunter Use mapply like this on large

Re: [R] Multiple if function

Dénes: A fair point! The only reason I have is ignorance -- I have not used data.table. I am not surprised that it and perhaps other packages (dplyr maybe?) can do things in a reasonable way very efficiently. The only problem is that it requires us to learn yet another package/paradigm. There

Re: [R] Multiple if function

Hi Maria, Why not exploit some simple boolean facts (FALSE=0, TRUE=1) in your calculation, so ASBclass = c(1,2,2,3,2,1) Flow = c(1,1,1,1,1,1) factor = ((ASBclass==1) * 0.1 + (ASBclass==2) * 0.15 + (ASBclass==3) * 0.2) deviation = factor * Flow cheers Peter > On 15 Sep 2015, at 12:56,

Re: [R] Multiple if function

15 4:43 PM > To: David L Carlson <dcarl...@tamu.edu> > Cc: Peter Alspach <peter.alsp...@plantandfood.co.nz>; r-help@r-project.org > Subject: Re: [R] Multiple if function > > Thanks, David. > > I would say, not quite. > > What if the alternatives are: > &g

Re: [R] Multiple if function

avid L Carlson <dcarl...@tamu.edu> Cc: Peter Alspach <peter.alsp...@plantandfood.co.nz>; r-help@r-project.org Subject: Re: [R] Multiple if function Thanks, David. I would say, not quite. What if the alternatives are: If class = "a" multiply y by 2; If class = "b" add 5

Re: [R] Multiple if function

On Tue, 15 Sep 2015, Bert Gunter wrote: Thanks to both Davids. I realize that these things are often a matter of aesthetics -- and hence have little rational justification -- but I agree with The Other David: eval(parse) seems to me to violate R's soul( it makes R a macro language instead of a

Re: [R] Multiple if function

dat$Flow ) >ABC > 23.02000 12.2 3.24037 > > Best; > The Other David > >> >> David >> >> -Original Message- >> From: Bert Gunter [mailto:bgunter.4...@gmail.com] >> Sent: Tuesday, September 15, 2015 4:43 PM >&

Re: [R] Multiple if function

lege Station, TX 77840-4352 > > > -Original Message- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Bert Gunter > Sent: Tuesday, September 15, 2015 3:51 PM > To: Peter Alspach > Cc: r-help@r-project.org > Subject: Re: [R] Multiple if function > &

Re: [R] Multiple if function

>> cat <- LETTERS[1:3] >>> mult <- c(.1, .15, .2) >>> dat$Flow * mult[match(dat$ASB, cat)] >> [1] 1.151 1.380 2.100 >> >> - >> David L Carlson >> Department of Anthropology >> Texas A Universit

[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  ...   

Re: [R] Multiple if function

Maria: Have you read An Intro to R or other R tutorial? There are many on the web and this is a basic idea that they would explain (with examples). ?ifelse ##a vectorized kind of if conditional is one way to do this (though it can get a little convoluted). There are others (e.g. splitting and

Re: [R] Multiple if function

-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

Re: [R] Multiple if function

> HTH > > Peter Alspach > > -Original Message- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Maria Lathouri > Sent: Tuesday, 15 September 2015 10:57 p.m. > To: r-help@r-project.org > Subject: [R] Multiple if function > > Dear all, > >

Re: [R] Multiple if function

> > -Original Message- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Maria Lathouri > Sent: Tuesday, 15 September 2015 10:57 p.m. > To: r-help@r-project.org > Subject: [R] Multiple if function > > Dear all, > > I am writing as I would like