Re: Replacing 1 to many in a list

• To: mathgroup at smc.vnet.net
• Subject: [mg29265] Re: [mg29250] Replacing 1 to many in a list
• From: BobHanlon at aol.com
• Date: Sat, 9 Jun 2001 03:08:52 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```In a message dated 2001/6/8 4:38:39 AM, cjohnson at shell.faradic.net writes:

>I think this is probably simple, but I can't find a natural way to do it
>yet.  I hope someone out there can help.  I have a vector numbers with
>some Null's scattered throughout.  The number and location of missing data
>varies.  For example,
>
>vector = {6, 6, 5, 4, 4, 4, Null, 6, Null, 44, Null, 4, 4, 5}
>
>Position[vector, Null]
>
>{{7}, {9}, {11}}
>
>Now "/." will let me replace all instances of Null with the same variable
>but I want to replace each instance with a different variable.  I would
>prefer to use x[1], x[2] and x[3], but if it were easier, then x[7], x[9]
>and x[11] would be OK also.
>
>The prefered end result would be:
>
>{6, 6, 5, 4, 4, 4, x[1], 6, x[2], 44, x[3], 4, 4, 5}
>

{6, 6, 5, 4, 4, 4, Null, 6, Null, 44, Null, 4, 4, 5} /.
(n=1; Null :> x[n++])

{6, 6, 5, 4, 4, 4, x[1], 6, x[2], 44,
x[3], 4, 4, 5}

Bob Hanlon
Chantilly, VA  USA

```

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