Hello, Pablo,
if() doesn't accept a vector as its argument the way you may want it to;
take a look at ifelse().
Regards -- Gerrit
On Tue, 3 Aug 2010, Pablo Cerdeira wrote:
Hi All,
I'm trying to run the following script in R, but I'm getting a warning saying:
Warning message:
In if (z < 0) { :
the condition has length > 1 and only the first element will be used
As you can see, I'm sending a vector x to the function f without any
problem. The function f calculates the y value for each x.
But the function f needs to convert the x to positive values (the mod
function). And when it tries to convert, it always uses the first
value of x.
What I'm doing wrong here?
mod = function(x) {
if (x < 0) {
mod <- x*(-1)
}
else {
mod <- x
}
}
f = function(x) {
f <- mod(x)/x
}
x <- seq(-1,1,0.01)
x
y <- f(x)
y
plot(f,xlim = c(-1,1))
remove(x,y,f,mod)
best regards,
--
Pablo de Camargo Cerdeira
pa...@fgv.br
pablo.cerde...@gmail.com
+55 (21) 3799-6065
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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.
