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MathGroup Archive 2013

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Re: Mathematica and Lisp

  • To: mathgroup at smc.vnet.net
  • Subject: [mg130053] Re: Mathematica and Lisp
  • From: "Nasser M. Abbasi" <nma at 12000.org>
  • Date: Thu, 7 Mar 2013 03:58:57 -0500 (EST)
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  • Reply-to: nma at 12000.org

On 3/6/2013 4:54 AM, Bill Rowe wrote:

> But
> if I had a variable mylist set to {x,y,z}, then I would either
> code the sum as Plus@@myList or Total@myList or Total[myList]
>
> Similarly if I myMatrix were a n x m array and I wanted to
> compute the sum of each row, I might well code this as Plus@@@myMatrix.
>

Nice examples.

I do not use @@@ myself. But interesting that the use
of Total in the matrix case does not follow the example
from the list case:

------- OK -----------------
myList = {1, 2, 3};
Plus  @@ myList
Total @  myList
-----------------------

So, I thought it should then work the same for matrix, I should
remove one "@" for Total compared to the Plus case

------Not OK -------------------
myList = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}
Plus  @@@ myList
Total @@  myList
------------------------------

I need to look more into this to see why it did
not follow the same example for list.

--Nasser



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