Re: sparsearray and random
- To: mathgroup at smc.vnet.net
- Subject: [mg71456] Re: sparsearray and random
- From: Bill Rowe <readnewsciv at sbcglobal.net>
- Date: Sun, 19 Nov 2006 01:10:11 -0500 (EST)
On 11/18/06 at 4:41 AM, Arkadiusz.Majka at gmail.com wrote:
>a = Random[Integer, {3, 7}]
>Normal[SparseArray[(i_ /; 3 â?¤ i â?¤ a) -> p, 10]]
>is not the same as this:
>Normal[SparseArray[(i_ /; 3 â?¤ i â?¤Random[Integer, {3, 7}] ) -> p,
>10]]
In the first case you generate a single random number. In the
second case you generate a random number for each position for
each element of the array.
Compare
a = Random[Integer, {3, 7}]
SparseArray[i_ /; 3 <= i <= a -> p, 10]//Trace
to
SparseArray[i_ /; 3 <= i <= Random[Integer, {3, 7}] -> p,
10]//Trace
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