Re: Series [was Change head, with Apply?]

*To*: mathgroup at smc.vnet.net*Subject*: [mg51872] Re: Series [was Change head, with Apply?]*From*: Paul Abbott <paul at physics.uwa.edu.au>*Date*: Thu, 4 Nov 2004 01:49:16 -0500 (EST)*Organization*: The University of Western Australia*References*: <ckfsid$iv7$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

In article <ckfsid$iv7$1 at smc.vnet.net>, CIMICDK at gmail.com (Brian Christensen) wrote: > I have made a function that contains Series[...], I need to add some > ekstra to this and therefor i use Normal[Series[...]]+R. If i use > Head[%], it shows "Plus" And i would like to change this to > TaylorSeriesData, How do i do this? I have tried a lot, but i cant get > anywhere. If i do not use Normal, Head will return "SeriesData", but i > need to add the R > How do i change the function to TaylorSeriesData? For definiteness, suppose your series is series = f[x] + O[x]^3 Note that adding the term O[x]^3 automatic coerces series expansion. Now, I must be missing the point of your question. Is R meant to be remainder (of higher order than the given series) or just an arbitrary term? If it is the latter then you can just add it to the series series + R However, if your R is, say, a x^4, then you would need to do this: Normal[series] + a x^4 + O[x]^5 Cheers, Paul -- Paul Abbott Phone: +61 8 6488 2734 School of Physics, M013 Fax: +61 8 6488 1014 The University of Western Australia (CRICOS Provider No 00126G) 35 Stirling Highway Crawley WA 6009 mailto:paul at physics.uwa.edu.au AUSTRALIA http://physics.uwa.edu.au/~paul