       Re: V6 evaluation inside Table and plot

• To: mathgroup at smc.vnet.net
• Subject: [mg76652] Re: V6 evaluation inside Table and plot
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Fri, 25 May 2007 06:35:08 -0400 (EDT)
• Organization: Uni Leipzig
• References: <f33onq\$l4v\$1@smc.vnet.net>

```Hi,

and

Table[Evaluate[f''[x]], {x, 0, 1, .2}]

works as well as

Table[Evaluate[f'[x]], {x, 0, 1, .2}]

Regards
Jens

Gerry Flanagan wrote:
> Define a simple function
>
> In:= f = Function[{x}, x^3]
>
> Out= Function[{x}, x^3]
>
> Taking two derivatives works as it should
>
> In:= f''[x]
>
> I was converting some packages to work with V6, and immediately ran into
> some evaluation issues I don't understand. It looks like forms like
> f''[x] (derivative) are evaluated differently inside of Table and Plot
> than outside.
>
> Out= 6 x
>
> But this does not?
>
> In:= Table[f''[x], {x, 0, 1, .2}]
>
> Out= {0, 0, 0, 0, 0, 0}
>
> Strangely, this works
>
> In:= Table[f'[x], {x, 0, 1, .2}]
>
> Out= {0., 0.12, 0.48, 1.08, 1.92, 3.}
>
> Determining the derivative outside the Table makes it work again.
>
> In:= g = f'';
>
> In:= tmp = Table[g[x], {x, 0, 1, .2}]
>
> Out= {0., 1.2, 2.4, 3.6, 4.8, 6.}
>
> Gerry Flanagan
>

```

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