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Symptoms: curve with log x axis gets the wrong
x limits (in 2.6.1, I believe introduced in this version).
Credit goes to Mike McCoy for detecting the problem.
Demonstration:
x = 1:5
plot(x,5*exp(-x),xlim=c(0.1,1000),log="x")
xvec = 10^seq(-1,3,length=100)
lines(xvec,5*exp(-xvec))
curve(5*exp(-x),add=TRUE,col=2,lwd=3)
I believe the problem arises from this fix:
o curve() with unspecified 'from', 'to' and 'xlim'
now reuses the
previous x limits, and not slightly larger ones.
and I believe the solution is to replace this ...
if (is.null(xlim))
delayedAssign("lims", {
pu <- par("usr")[1:2]
ll <- if (par("xlog"))
10^pu
else pu
if (par("xaxs") == "r")
extendrange(ll, f = -1/27)
else ll
})
with this ...
if (is.null(xlim))
delayedAssign("lims", {
pu <- par("usr")[1:2]
if (par("xaxs") == "r")
pu <- extendrange(pu, f = -1/27)
ll <- if (par("xlog"))
10^pu
else pu
ll
})
i.e., extend pu, not ll ...
cheers
Ben Bolker
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>>>>> "BB" == Ben Bolker <bolker at ufl.edu> >>>>> on Sat, 08 Dec 2007 23:12:06 -0500 writes:BB> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 BB> Symptoms: curve with log x axis gets the wrong x BB> limits (in 2.6.1, I believe introduced in this version). BB> Credit goes to Mike McCoy for detecting the problem. BB> Demonstration: BB> x = 1:5 plot(x,5*exp(-x),xlim=c(0.1,1000),log="x") xvec BB> = 10^seq(-1,3,length=100) lines(xvec,5*exp(-xvec)) BB> curve(5*exp(-x),add=TRUE,col=2,lwd=3) BB> I believe the problem arises from this fix: BB> o curve() with unspecified 'from', 'to' and 'xlim' BB> now reuses the previous x limits, and not slightly BB> larger ones. BB> and I believe the solution is to replace this ... [ ..... ] Thank you, Ben (and Mike). That's indeed a new buglet, and you are even right about when it happened. Mea culpa. BB> cheers Ben Bolker {aaaah, it feels good to get a message from you without the appended Nabble spam :-)} Regards, Martin