R help - Apr 2012 - interpolation issue

This moment I got stuck with one interpolation issue
the sample data which I have is as follows

pre1  <- c(10.34615 , 52.02116, 146.17357, 243.28644, 347.41504, 431.67105,
521.42712, 629.00446 ,729.95941,                            827.86279,
921.55078, 956.44446) 
pre2  <- c( 983.4477692, 973.6199013, 958.0722141, 938.8194208 ,915.1833983,
852.1671089, 765.0037479,                                  654.0372907,
526.7369169, 397.0581990, 279.9788079, 229.5127059,185.2578164 ,147.2534510 
,115.1949457,  88.5712513,  66.7337287,  49.0140828, 23.3535195 , 
0.6609724) 

I have tried approx function
approx(pres, sci.pre)
Error in xy.coords(x, y) : 'x' and 'y' lengths differ 

I am looking for interpolated output with 1 x 19  demotions . 

does somebody knows how to deal with this issue ?
Thanks 

Uday 

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On Wed, Apr 18, 2012 at 03:55:07AM -0700, uday wrote:
> This moment I got stuck with one interpolation issue
> the sample data which I have is as follows
> 
> pre1  <- c(10.34615 , 52.02116, 146.17357, 243.28644, 347.41504,
431.67105,
> 521.42712, 629.00446 ,729.95941,                            827.86279,
> 921.55078, 956.44446) 
> pre2  <- c( 983.4477692, 973.6199013, 958.0722141, 938.8194208
,915.1833983,
> 852.1671089, 765.0037479,                                  654.0372907,
> 526.7369169, 397.0581990, 279.9788079, 229.5127059,185.2578164 ,147.2534510
> ,115.1949457,  88.5712513,  66.7337287,  49.0140828, 23.3535195 , 
> 0.6609724) 
> 
> I have tried approx function
> approx(pres, sci.pre)
> Error in xy.coords(x, y) : 'x' and 'y' lengths differ 
Hi.

What is "pres" and "sci.pre"? Probably, they are vectors of
different lengths and they were interpreted as "x" and "y"
in approx(), see ?approx. If "sci.pre" should be "xout" in
approx(), then you have to specify some "y".

The vectors "pre1" and "pre2" have lengths 12 and 20, but
their relationshiop to "pres" and "sci.pre" is not clear.

Petr Savicky.