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Groups > comp.soft-sys.math.mathematica > #16562 > unrolled thread
| Started by | Kevin <kjm@KevinMcCann.com> |
|---|---|
| First post | 2014-02-13 06:01 +0000 |
| Last post | 2014-02-16 04:02 +0000 |
| Articles | 3 — 3 participants |
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Keeping the correct order Kevin <kjm@KevinMcCann.com> - 2014-02-13 06:01 +0000
Re: Keeping the correct order Oliver Jennrich <oliver.jennrich@gmx.net> - 2014-02-15 08:58 +0000
Re: Keeping the correct order "Kevin J. McCann" <kjm@KevinMcCann.com> - 2014-02-16 04:02 +0000
| From | Kevin <kjm@KevinMcCann.com> |
|---|---|
| Date | 2014-02-13 06:01 +0000 |
| Subject | Keeping the correct order |
| Message-ID | <ldhn3u$jnv$1@smc.vnet.net> |
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? Thanks, Kevin
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| From | Oliver Jennrich <oliver.jennrich@gmx.net> |
|---|---|
| Date | 2014-02-15 08:58 +0000 |
| Message-ID | <ldna7t$289$1@smc.vnet.net> |
| In reply to | #16562 |
Kevin <kjm@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
--
Space - The final frontier
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| From | "Kevin J. McCann" <kjm@KevinMcCann.com> |
|---|---|
| Date | 2014-02-16 04:02 +0000 |
| Message-ID | <ldpd9j$6na$1@smc.vnet.net> |
| In reply to | #16566 |
Nothing "dirty" about it if it works! Thanks, it does.
Kevin
On 2/15/2014 3:58 AM, Oliver Jennrich wrote:
> Kevin <kjm@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
>
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