Re: Log manipulation
- To: mathgroup at smc.vnet.net
- Subject: [mg16837] Re: Log manipulation
- From: "Allan Hayes" <hay at haystack.demon.co.uk>
- Date: Thu, 1 Apr 1999 21:35:17 -0500
- References: <7dprc6$dq3@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Pierre infelta <pierre.infelta at epfl.ch> wrote in message news:7dprc6$dq3 at smc.vnet.net... > I am looking for the command that will do the opposite of powerExpand > for the Log function. ........ > Command[Log[a] + Log[b]] > > to get > > Log[a b] Pierre, We can make one UnPowerExpand[expr_]:= expr//.Log[x_]+Log[y_]:> Log[x y] UnPowerExpand[Log[p]+Log[q]+Log[r]] Log[p q r] Allan --------------------- Allan Hayes Mathematica Training and Consulting Leicester UK www.haystack.demon.co.uk hay at haystack.demon.co.uk Voice: +44 (0)116 271 4198 Fax: +44 (0)870 164 0565