Re: Some way to differentiate (1st order derivative)?

[<ln...@dr...>]

> On Tuesday 23 October 2007 13:01, ln...@dr... wrote:
>>
>> My biggest problem for the moment is the following: I did not find any=
thing
>> useful about 'assignment' in the help file (I have the most recent CVS=
 version
>> of gnuplot, of course). How should I use it then? Is there a configure=
-time
>> switch needed to compile it into gnuplot?
>
> No, but it is a very recent feature.
>
> Peter <pl...@pi...> referred to it as an "assignment feature" b=
ecause
> the original trial implementation was in the form of a separate functio=
n
> named assign().  In the end, the same functionality was incorporated by
> adding support for two standard operators:  =3D  and  ,
> Both act as they do in the C language syntax.
>
> '=3D' is an assignment operator, taking a variable name on the left and
> an expression on the right.
>
> ',' is a serial evaluation operator separating independently evaluatied
> expressions.
>
> Combining these operators allows functions or expressions to have
> side effects.  In particular, a function or expression evaluation can
> have the side effect of storing its result in a named variable.
>
> An example of using these to track successive data points is provided
> in the new demo file data_feedback.dem
> 	http://gnuplot.sourceforge.net/demo_4.3/data_feedback.html
>


Thanks, Ethan!

Now I suppose I have to read a concise book on "C" to familiarise myself =
with
this syntax :)

Levente