Rule to Function, Frontend funnies

*To*: mathgroup at smc.vnet.net*Subject*: [mg5307] Rule to Function, Frontend funnies*From*: Wouter Meeussen <meeussen.vdmcc at vandemoortele.be>*Date*: Sat, 23 Nov 1996 01:44:44 -0500*Sender*: owner-wri-mathgroup at wolfram.com

how can I convert a rule to a function? if I get a result from rulesoln = DSolve[{y'[x]==y[x]/(c+1/x),y[0]==1},y[x],x] in the form : 2 x/c - Log[1 + c x]/c {{y[x] -> E }} how do I get the definition : y[x_]:= E^(x/c - Log[1 + c x]/c^2) (*************************************************************************) Funny : in any text editor, like notepad , I just cut & paste the pieces I need. In the Frontend, I can force Mma to produce a one-dimensional output line by asking % // InputForm {{y[x] -> E^(x/c - Log[1 + c*x]/c^2)}} but when I try to edit it, or make an input-line out of that, either by Action-Prepare.Input-Copy.Output.from.Above (Control-Shift-L) or by Menu-Cell-Inactive and Menu-Style-Input, the result is : No Input Form was generated for this Cell (*************************************************************************) Even Funnier : doing Control-Shift-L and Shift-Enter produces: General::spell: Possible spelling error: new symbol name "Form" is similar to existing symbols {CForm, For}. General::spell1: Possible spelling error: new symbol name "for" is similar to existing symbol "For". Cell for Form generated Input No this was (*************************************************************************) Anybody out there to whom this happens too? After some {soul,FullForm}-searching, I came up with this rule-eating-rule : Flatten[rulesoln]/.y[x]->y[x_]/.Rule->SetDelayed {Null} you don't get to see much except "{Null}", but it results in: ?y Global`y y[x_] := E^(x/c - Log[1 + c*x]/c^2) (*************************************************************************) Is there a fast & easy Cut-and-Paste way to do it, not leaving the FrontEnd? Is this the same on a Mac-machine? Is this the same in Mma 3.0 for Windows? Wouter. NV Vandemoortele Coordination Center Group R&D Center Prins Albertlaan 79 Postbus 40 B-8870 Izegem Tel: +/32/51/33 21 11 Fax:+32/51/33 21 75 vdmcc at vandemoortele.be