Hi Dan
Am Donnerstag 17 Juli 2008 20:07 schrieb Dan Reinholz:
[...]
> The problem is that when I run it I get the error:
>
> bsd% python simpsons_rule.py
> Traceback (most recent call last):
> File "simpsons_rule.py", line 27, in <module>
> g.plot(graph.data.function("y(x)=g(x)",
> context=locals(), points=500))
> AttributeError: 'function' object has no attribute
> 'plot'
>
> Can anybody shed some light on the problem?
Ok, let's look at the code.
You have
> g = graph.graphxy(width=8,
> x=axis.linear(min=0, max=intl, title="$x$"),
> y=axis.linear(title="$\sin(x) + x$"))
and also
> for i in range(0, nsubintl):
> def g(x):
> if x0+i*w0 <= x <= x0+(i+1)*w0: return
> (f(x0+i*w0) + f(x0+(i+0.5)*w0) + f(x0+(i+1)*w0) )/(2 *
> w0 * w0) * x * x + (f(x0+(i+1)*w0) - f(x0+i*w0) )/(2
> * w0) * x + f(x0+(i+0.5)*w0)
>
> g.plot(graph.data.function("y(x)=g(x)",
> context=locals(), points=500))
With the 'def g(x):' you are basically hiding the 'g = graph.graphxy' from
before. So the local g is just the function and doesn't have the plot
method. Just use another naming for g or g.
Gruß,
Stefan
pgpFurqzIpNtO.pgp
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