Message-ID: <20100111134447.14352ffl7bu73br3@psy2.psych.tu-dresden.de>
Date: 2010-01-11T12:44:47Z
From: René Mayer
Subject: interpolation
Dear R-users,
I have a complex line by xy-values (ordered by z).
And I would like to get interpolated y-values on the positions of x = 0:600.
How do I get the correct points?
x=c(790,790,790,790,790,786,783,778,778,766,763,761,761,761,715,628,521,350,160,134,134,129,108,101,93,111,161,249,288,243,139,45,7)
y=c(606,606,606,606,606,612,617,627,627,640,641,641,641,641,689,772,877,1048,1240,1272,1272,1258,1242,1239,1239,1214,1122,959,770,479,273,133,45)
z=c(0,29,58,87,116,145,174,203,232,261,290,319,348,377,406,435,464,493,522,551,580,609,638,667,696,725,754,783,812,841,870,899,928)
plot(y,x,type="b")
# this fails ?????
lines(approx(y,x),col="blue") # with xout = c(0:600)
thanks in advance,
Ren?
--
Dr. rer. nat. Dipl.-Psych. Ren? Mayer
Dresden University of Technology
Department of Psychology
Zellescher Weg 17
D-01062 Dresden
Tel.: +49-351-4633-4568
Email: mayer at psychologie.tu-dresden.de