On Jul 17, 2009, at 11:27 AM, NDC/jshipman wrote:
Hi,
I am new to R plot. I am trying to scale my y axis in log. When I
do this I receive the following error
Error in axis(side = side, at = at, labels = labels, ...) :
CreateAtVector [log-axis()]: axp[0] = 0 < 0!
In addition: Warning messages:
1: In plot.window(...) :
nonfinite axis limits [GScale(-inf,1.31772,2, .); log=1]
2: In axis(side = side, at = at, labels = labels, ...) :
CreateAtVector "log"(from axis()): axp[0] = 0 !
My code is as follows:
foundOr <- read.table("yahoos_f.txt", sep="," , header=T)
if (max(foundOr$s_) >= max(notFoundOr$s_)) maxY = log(max(foundOr
$s_)) else maxY = log(max(notFoundOr$s_))
jpeg('clusterYS_.jpg', quality = 100, bg = "white", res = 200, width
= 2000, height = 2000 )
plot(foundOr$uid, foundOr$s_, xlab="uid", ylab="Log Search
Results", main="uid vs Search", pch=20, col="blue", log = "y",
xlim=c(0,300), ylim=c(0,maxY))
dev.off()
If I remove the log = "y" everything works fine. Am I using the log
call incorrectly? Any help would be appreciated.
You are trying to set the minimum value of the y axis to 0 and:
> log10(0)
[1] -Inf
Note that when log scaled axes are used, they are common logs (base
10), not natural logs (base e).
Since the y axis is already log10 transformed internally, you don't
need to set the maximum value of the y axis to log10(max(foundOr$s_)).
Just use max(foundOr$s_)...
HTH,
Marc Schwartz
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