Re: Change of function in an ODE
- To: mathgroup at smc.vnet.net
- Subject: [mg109112] Re: Change of function in an ODE
- From: Albert Retey <awnl at gmx-topmail.de>
- Date: Mon, 12 Apr 2010 23:04:08 -0400 (EDT)
- References: <hputmu$lgd$1@smc.vnet.net>
hi,
Am 12.04.2010 12:46, schrieb Christoph Lhotka:
> expr=r^4 R''''[r] + 2 r^3 R'''[r] - r^2 R''[r] + r R'[r] - L^4 r^4 R[r] == 0
>
> expr/.Table[D[R[r]->r^2 Log[r] G[r],{r,i}],{i,0,4}]
expr /. R -> Function[{r}, r^2 Log[r] G[r]]
hth,
albert