RE: question: {a,b,c}->{{a,b},{b,c}}??

*Subject*: [mg2495] RE: [mg2459] question: {a,b,c}->{{a,b},{b,c}}??*From*: jfultz ("John R. Fultz")*Date*: Wed, 15 Nov 1995 06:58:10 GMT*Approved*: usenet@wri.com*Distribution*: local*Newsgroups*: wri.mathgroup*Organization*: Wolfram Research, Inc.*Sender*: daemon at wri.com ( )

Here's something that will do the trick...it's generalized and fast: In[1]:= data={a,b,c,d,e}; In[2]:= modifieddata=Transpose[{Drop[data,-1],Drop[data,1]}] Out[2]= {{a, b}, {b, c}, {c, d}, {d, e}} John Fultz Wolfram Research, Inc. ---------- >From: Bart van der Zwet[SMTP:B.W.v.d.Zwet at stud.tue.nl] >To: mathgroup at smc.vnet.net >Subject: [mg2459] question: {a,b,c}->{{a,b},{b,c}}?? Hello, I'm working on a problem in which I have to substitute a list, for instance {a,b,c,d} by the other list {{a,b},{b,c},{c,d}}. I've managed to solve it for a given length of the first list, by using the substitution-rule : {a_,b_,c_} -> {{a,b},{b,c}} (this for a list of three elements) I would like to find out how this can be done for a list of arbitrary length. Yours, Bart van der Zwet Student Mathematics Eindhoven University of Technology The Netherlands e-mail : B.W.v.d.Zwet at stud.tue.nl