Re: Replace expressions
- To: mathgroup at smc.vnet.net
- Subject: [mg7691] Re: Replace expressions
- From: Vanessa Portioli Rolnik <vanessa at icmsc.sc.usp.br>
- Date: Sun, 29 Jun 1997 22:17:26 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hello all,
I have expressions of the type:
test=u[i,{1,j},{2,k},t]
and I want to perform the following replacements:
i->0,t->0,{1,j}->1*j and {2,k}->2*k
to get
u[0,j,2k,0]
I use the following command
test/.{{a_Integer,b_Symbol}->a*b,c_Symbol->0}
but I the result is
0[0, 0[1, 0], 0[2, 0], 0]
instead of what I expected it to be:
u[0,j,2k,0]
I need a command to hold the head of the expression and the lists, or a
better way to perform this replacement.
Please answer by email to vanessa at icmsc.sc.usp.br. If there is enough
interest, I will post the answers to the net.
Thanks in advance for any help,
Vanessa