R help - Feb 2011 - Replacing an element in a vector

Dear R helpers

I seem to have one trivial problem but can't find solution to it.

Suppose I have following input.

A = c(1,  3,  0,  5,  8)                  # 3rd element is 0
B = c(100, 30,  0,  25,  40)          # 3rd element is 0

C = A/B
> C
[1] 0.01 0.10  NaN 0.20 0.20

Obviously, I can't divide 0/0 and hence NaN. My problem is how to replace
this NaN say by 0.

So that I can have C as

C = c(0.01, 0.10, 0, 0.20, 0.20) 

I tried the replace command but can't get rid of NaN.

Kindly guide.

Vincy



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Dear Vincy,

Try this:
C[is.nan(C)] <- 0

HTH,
Ivan

Le 2/28/2011 13:10, Vincy Pyne a ?crit :
> Dear R helpers
>
> I seem to have one trivial problem but can't find solution to it.
>
> Suppose I have following input.
>
> A = c(1,  3,  0,  5,  8)                  # 3rd element is 0
> B = c(100, 30,  0,  25,  40)          # 3rd element is 0
>
> C = A/B
>
>> C
> [1] 0.01 0.10  NaN 0.20 0.20
>
> Obviously, I can't divide 0/0 and hence NaN. My problem is how to
replace this NaN say by 0.
>
> So that I can have C as
>
> C = c(0.01, 0.10, 0, 0.20, 0.20)
>
> I tried the replace command but can't get rid of NaN.
>
> Kindly guide.
>
> Vincy
>
>
>
> 	[[alternative HTML version deleted]]
>
>
>
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-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. S?ugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de

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