Christoph,
I see two problems:
(1) use plot(x,y,pch=16,xlim=c(0,10),asp=1), as the default has the x/y scales
different.
(2) It looks to me that the expression srt=180/pi*atan(slope) should be
srt=180*atan(slope)/pi
Regards,
Tom
Dr. Christoph Scherber wrote:
Dear all,
I stumbled over a
Dear all,
I stumbled over a problem recently when trying to use srt with text() on a
windows device.
What I intended to do was to plot a simple regression line, and to rotate
a piece of text such that the text has the same angle as the regression
line.
However, the text is always plotted in a
I think this comment for ?par, meant for both crt and srt, applies:
crt
A numerical value specifying (in degrees) how single characters
should be rotated. It is unwise to expect values other than multiples
of 90 to work. Compare with srt which does string rotation.
So I would say that
Note that the scale of x-axis and y-axis is different in your plot. One
simple way to avoid this is to keep the data unit in the x direction is
equal that in the y direction, by setting asp=1 in calling plot function.
X
Dr. Christoph Scherber 写道:
Dear all,
I stumbled over a problem recently
Thanks to all for the postings so far!
I found that setting asp=0.5 and then dividing the slope by 2 seems to do
the trick:
##
x=1:10
y=x*2-rnorm(1:10)
plot(x,y,pch=16,asp=0.5)
abline(lm(y~x))
yval=predict(lm(y~x),list(x=rep(2,length(x[1]
slope=as.numeric(lm(y~x)[[1]][2])
On Tue, 27 May 2008, Xiaohui Chen wrote:
Note that the scale of x-axis and y-axis is different in your plot. One
simple way to avoid this is to keep the data unit in the x direction is equal
that in the y direction, by setting asp=1 in calling plot function.
Or when that is not possible or
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