R help - Oct 2012 - Help me please to code....

User has to type (input) x.  After input....code has to check X with
statement if

There is a statement IF. 

If X=0 then Y=5/2 else =7;

How to code it please. I tried but my code does not work ;( I wanna see how
it looks like( thank u in advance(



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Hello,

First of all, you should _really_ try to read An Introduction to R, file 
R-intro.pdf that comes with every installation of R. The answer to your 
question is in chapter 9 Grouping, loops and conditional execution.
It's the very first example:

"9.2.1 Conditional execution: if statements
The language has available a conditional construction of the form
 > if (expr_1) expr_2 else expr_3
where expr 1 must evaluate to a single logical value and the result of 
the entire expression is
then evident."

Note the "evident" bit.


if(X == 0) Y <- 5/2 else Y <- 7

or, when you become more familiar with R,

Y <- if(X == 0) 5/2 else 7

But do read the manual.
Hope this helps,

Rui Barradas

Em 21-10-2012 20:03, Rlotus escreveu:
> User has to type (input) x.  After input....code has to check X with
> statement if
>
> There is a statement IF.
>
> If X=0 then Y=5/2 else =7;
>
> How to code it please. I tried but my code does not work ;( I wanna see how
> it looks like( thank u in advance(
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Help-me-please-to-code-tp4646932.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

HI,
Try this:
fun1<-function(X){
?Y<-ifelse(X==0,5/2,7)
?return(Y)}
?fun1(5)
#[1] 7
?fun1(0)
#[1] 2.5
?fun1(2)
#[1] 7
A.K.





----- Original Message -----
From: Rlotus <yerlan_ at hotmail.com>
To: r-help at r-project.org
Cc: 
Sent: Sunday, October 21, 2012 3:03 PM
Subject: [R] Help me please to code....

User has to type (input) x.? After input....code has to check X with
statement if

There is a statement IF. 

If X=0 then Y=5/2 else =7;

How to code it please. I tried but my code does not work ;( I wanna see how
it looks like( thank u in advance(



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View this message in context:
http://r.789695.n4.nabble.com/Help-me-please-to-code-tp4646932.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

thank you so much for helping! Now i got how to do it ;)



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