Re: SetDelayed::write ... [x_] is protected

*To*: mathgroup at smc.vnet.net*Subject*: [mg97945] Re: SetDelayed::write ... [x_] is protected*From*: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>*Date*: Thu, 26 Mar 2009 05:22:13 -0500 (EST)*References*: <16449487.41188.1237895183797.JavaMail.hanlonr@127.0.0.1>

I already told you before that you should get rid of the SetDelayed (:=) and use Set (=) instead for the definition of myfun. Cheers -- Sjoerd On Mar 25, 12:41 pm, "Serych Jakub" <Ser... at panska.cz> wrote: > Thanks for the Flatten, now it seem that it works (without any error > messages), but in fact it doesn't work. > > sol = {{i1 -> 220/x}, {i2 -> 100 + x}}; > myfun[x_] := 50*i1 + 2*i2 /. Flatten[sol] > (no errors here) but: > > In: myfun[1] > > Out: 11000/x + 2 (100 + x) > > and not 11202 which would be result for argument 1. > > So it cannot recognize (or connect together with the pattern x_) the = > variable > x in the result from sol. > > What to do with it? > > Thanks > > Jakub > > > -----Original Message----- > > From: Bob Hanlon [mailto:hanl... at cox.net] > > Sent: Tuesday, March 24, 2009 12:46 PM > > To: Serych Jakub > > Cc: mathgr... at smc.vnet.net > > Subject: RE: is protected > > > sol = {{i1 -> 220/x}, {i2 -> 100 + x}}; > > > myfun[x_] = 50*i1 + 2*i2 /. Flatten[sol] > > > 2*(x + 100) + 11000/x > > > Bob Hanlon > > > On Tue, Mar 24, 2009 at 7:46 AM , Serych Jakub wrote: > > > > Dear M users, > > > I have solution of equations which is dependend on one > > parameter lets > > > say: > > > sol={{i1->220/x}, {i2 -> 100+x}} and I need to define > > function based > > > on this solution with the x as argument lets say: > > myfun[x_]:=50*220/x > > > + 2 (100+x); > > > > I'm trying to do it like this: > > > > myfun[x_]:=50 * i1 + 2 * i2 /. sol > > > > But it prints the error message: "SetDelayed::write ... [x_] is > > > protected". > > > > Does anybody know what's the problem and how to define such > > function? > > > > Thanks in advance > > > > Jakub