Re: Keeping the correct order
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- Subject: [mg132350] Re: Keeping the correct order
- From: "Kevin J. McCann" <kjm at KevinMcCann.com>
- Date: Sat, 15 Feb 2014 23:15:17 -0500 (EST)
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Nothing "dirty" about it if it works! Thanks, it does.
Kevin
On 2/15/2014 3:58 AM, Oliver Jennrich wrote:
> Kevin <kjm at KevinMcCann.com> writes:
>
>> I am doing some calculations that have terms like (1+h)(1+h'+h''). I
>> wish to do something like Series with this but only keep terms that are
>> up to some order in h. The kicker is that the derivatives are also of
>> the same order as h. How can I tell Mathematica about this?
>
> If you don't mind a dirty trick:
>
> (1 + h) (1 + h' + h'') /. {h -> a h, Derivative[n_][h] -> a Derivative[n][h]}
>
> Normal@Series[%, {a,0,1}] /. a-> 1
>