On Jan 11, 2010, at 7:44 AM, René Mayer wrote:
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")
That would plot x as a function of y (the reverse of the usual
convention. Is that what you want. If so, then the statement that
these are ordered by z is misleading. Ordering by z would suggest that
each series is a function of z. What sort of interpolation do you want
and in how many dimensions?
# this fails ?????
lines(approx(y,x),col="blue") # with xout = c(0:600)
thanks in advance,
René
--
Dr. rer. nat. Dipl.-Psych. René Mayer
Dresden University of Technology
Department of Psychology
Zellescher Weg 17
D-01062 Dresden
Tel.: +49-351-4633-4568
Email: ma...@psychologie.tu-dresden.de
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