Re: What's the matter with this?

• To: mathgroup at smc.vnet.net
• Subject: [mg56142] Re: [mg56109] What's the matter with this?
• From: János <janos.lobb at yale.edu>
• Date: Sat, 16 Apr 2005 03:53:10 -0400 (EDT)
• References: <200504150848.EAA11621@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```On Apr 15, 2005, at 4:48 AM, Steve Gray wrote:

> I have a list
>
> intertemp[[1]] = {{14, 17, {0.7929, 0.4366}, {2.8146, 11.3986}}
>
> and a simple function
>
> modxx[axx_] := axx[[2]] = Mod[axx[[2]], 14, 1];
>
> When I do modxx[intertemp[[1]]] I get this:
>
> Set::setps: {14, 17, {0.792902, <<19>>}, {2.81469, 11.3986}}
>      in assignment of part is not a symbol.
>
> What does this mean and how can I do it correctly?
> I must be making a very simple error.
> I want the 17 to become 3 with no other changes.
>
> Thank you
>
> Steve Gray

I think it is a problem with the extra opening { bracket in intertemp.

In[8]:=
intertemp = {14, 17,
{0.7929, 0.4366},
{2.8146, 11.3986}}
Out[8]=
{14, 17, {0.7929, 0.4366},
{2.8146, 11.3986}}

In[5]:=
modxx[axx_] := modxx[axx] =
Mod[axx[[2]], 14, 1];

In[10]:=
modxx[intertemp]
Out[10]=
3

Notice that my function definition is slightly different from yours :)

János

```

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