# Re: [R] Using if, else statements

From: jim holtman <jholtman_at_gmail.com>
Date: Wed, 23 Jul 2008 12:55:22 -0400

One more try and I quit: This is what happens if someone does not sent a sample of data you have to create things on the fly without testing.

days <- list(list("Sat", 1.21), list("Sun", 1.22), list("Mon", 0.91)) for (i in days){

.subset <- data\$d.o.w == i[[1]] # subset of data that matches    data\$admission[.subset] <- round(data\$admission[.subset] * i[[2]]) }
write.csv(data, file='xyz')

On Wed, Jul 23, 2008 at 11:44 AM, Robin Williams <robster3_at_hotmail.com> wrote:
> Hi all,
>
> Again I have searched the net and so on, without finding an answer to this
> surely simple problem. A short bit of code would be appreciated.
>
> I have a object named `data' with the following column headings.
>
> Date, maxitemp, minitemp, admissions, d.o.w.
>
> Where d.o.w. is day of the week, written "Sun" "Mon" etc.
>
> I just need to scale the Monday admissions by 0.91, the Saturday
> admissions by 1.21 and the Sunday admissions by 1.22. So basically what I
> want is:
>
> If d.o.w. == "Sat"
>
> Multiply Sat admissions by 1.21.
>
> (Now do I need an else statement here, or can I just do another)
>
> If d.o.w. == "Sun"
>
> Multiply "Sun" admissions by 1.22
>
> (and finally)
>
> If d.o.w. == "Mon"
>
> Multiply Monday admissions by 0.91.
>
> Else do nothing.
>
> I assume in my code I need to specify that I am using the data.frame
> `data', so do I need to write things like
>
> If(data[d.o.w.]=="Mon")
>
> I would then like to round the new admissions to integers (I assume I just
> use round(data\$admissions)), and output the new data to another csv file.
>
> I could of course do this in excel but I will need to extend this type of
> idea in the future so I would like to master it in R.
>
> Many thanks for any help/code.
>
> Robin Williams.
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

```--
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

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Received on Wed 23 Jul 2008 - 17:43:59 GMT

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