On 2014/3/17 15:32, Jim Lemon wrote:
On 03/18/2014 09:18 AM, Jinsong Zhao wrote:
Hi there,
I hope to rotate the Y label of axis(4) with -90 degree. I can typeset
the Y label using text() with srt = -90. However, I cannot get the
coordinate of the position that mtext() used.
In other words, I hope to convert:
mtext("Y label", side = 4, at = 0, line = 2)
to
text(x, 0, "Y label", str = -90)
Now, I don't know how to get the x in the above expression. I can give
it an arbitrary value. However, I hope it could be more precise.
Hi Jinsong,
If you mean the distance from the axis, mtext is placed by a multiple of
the height of a line of text. Therefore:
strheight("O") * 2
will give you an approximate distance in user units. You can then add
this to the user coordinate of the right ordinate of the plot:
par("usr")[2]
to get your "x" value. You will probably want to adjust this to get the
desired visual spacing.
Jim
Thank you very much for the hints. It's something complex than that,
because the strheight("O") is in inch, and that is different with
par("usr").
The following code may be the exact one I have got.
par(mar=c(4,4,4,4),xpd=NA)
plot(1:10)
axis(4)
mtext("Rain", side = 4, line = 2)
usr <- par("usr")
text((grconvertX(1, "ndc", "user") - usr[2])/2 + usr[2],
(usr[3]+usr[4])/2, "Rain", srt = 90, adj=c(0.5,1), col = "blue")
As you can see the two "Rain" not overlap very well. The difference may
be 1 lwd, I don't know. However, I have satisfied with the results very
well.
Regards,
Jinsong
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