[R] Using if, else statements

From: Robin Williams <robster3_at_hotmail.com>
Date: Wed, 23 Jul 2008 16:44:50 +0100


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.

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