Re: [PyX-user] First Plots with PyX

[Rich S. <rsh...@ap...>]

On Tue, 25 Mar 2008, Joerg Lehmann wrote:

> The problem is that with PyX you have to wrap your data (either functions,
> lists or files) in certain data provider classes, e.g.
>
>   g.plot(graph.data.function("y(x)=sin(x)")
> or
>   g.plot(graph.data.values(x=[1,2,3], y=[1,4,9]))

Jörg,

   Ah, that's what I thought. And, you answered my question to David
regarding this.

> As pointed out by David, have a look at the examples on the webpage,
> in particular:
>
>        http://pyx.sourceforge.net/examples/graphs/function.html

   I did look at this, but did not see how to apply it to my needs.

> Note furthermore that when plotting "non-standard" mathematical functions,
> especially functions you have defined yourself, you have to tell the data
> class under which name you want to access them, e.g.
>
>  def f(x):
>      # calculate result y
>     return y
>
>  g.plot(graph.data.function("y(x)=f(x)", context={"f": f}))

   This is what I did not fully understand how to write.

> Finally, as a side remark: Try to start with a reduced version of your
> code and build the more complex version only after the simple parts work.
> Especially when asking for help on this list, post a minimal example in
> order to allow people to quickly identify what's going on.

   Makes sense. I had isolated code and a few data tuples (from a collection
of about 360). But, I'll take it one function at a time. Will start with the
logistic curves. I'll probably have questions, but they'll be on a smaller
code base and just a single data set.

Thanks,

Rich

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