Re: Adding the elements of a list sequentially
- To: mathgroup at smc.vnet.net
- Subject: [mg109349] Re: Adding the elements of a list sequentially
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Fri, 23 Apr 2010 03:47:12 -0400 (EDT)
Your first example does not seem to be consistent with what you described.
f[a_?VectorQ, b_?VectorQ] := a + PadRight[b, Length[a], b];
a = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
b = {1, 2};
f[a, b]
{2,4,4,6,6,8,8,10,10,12}
f[b, a]
{2,4}
a = {1, 1, 1, 1, 1};
b = {1, 2, 3};
f[a, b]
{2,3,4,2,3}
f[b, a]
{2,3,4}
Bob Hanlon
---- ebaugh at illinois.edu wrote:
=============
I am looking for an efficient way to add the elements of a list
sequentially onto another list
For example, generate list c, given lists a and b:
a = {1,2,3,4,5,6,7,8,9,10}
b = {1,2}
c = {2,4,4,5,6,7,8,9,10,11}
another example:
a = {1,1,1,1,1}
b = {1,2,3}
c = {2,3,4,2,3}
It seems like there must be a built in function to do this, but
have been unable to find it.
Thanks a 10^6
Jason Ebaugh