Re: Symplify Table

*To*: mathgroup at smc.vnet.net*Subject*: [mg109051] Re: Symplify Table*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Mon, 12 Apr 2010 06:51:21 -0400 (EDT)

Correction: As David Park has already noted [mg109025] in this thread, it's dangerous to use upper case letters to begin names of objects you create. In particular, C is a protected symbol, used as the Head of parameters generated, for example, when solving differential equations. For the nonce, neither A nor B is a System symbol, so you could use both. But probably best to be consistent in naming three such related entities in a way such as he suggested. On 4/11/2010 4:31 AM, Murray Eisenberg wrote: > Use the "array processing" inherent in functions such as Plus and Times > that have the attribute of being Listable , namely: > > C = A - (1/2)B > > That's it! (You can do Simplify later. And even there, you don't need > to do any explicit indexing, but -- at least for a one-dimensional list > -- just use Map: Simplify/@C > > On 4/10/2010 6:52 AM, John Ertle Jr. wrote: >> I want to subtract array A by 1/2 array B and put it in array C. I need something like this except more complicated later. This is what I have thus far: >> >> C:=C=Simplify[Table[A[i]-1/2*B[i],{i,1,9}]] > > -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305