dear Sheldon,
dear Mario,
thank you both for your immediate help (S. answered 10 minutes after my question :)
Both versions of Riemann sums show realisations I was looking for.
HTH Wolfgang
<sen1 at math.msu.edu> schrieb:
> By this, I think you simply want to plot piecewise smooth functions.
>
> I use simple functions (sums of constants times the characteristic
> functions of intervals) as follows.
>
> Define the UnitStep and Indicator functions as follows:
>
>
> UnitStep(x):= (signum(x) + 1)/2;
>
> Ind(a,b,x):= UnitStep(x-a) - UnitStep(x-b);
>
> Suppose f(x) has the values
> 1.7 in [0,1]
> -2.0 in [1,2]
> 3.4 in [2,3]
> 0 elsewhere
>
> Just write
>
> f(x):= 1.7*Ind(0,1,x) - 2.0*Ind(1,2,x) + 3.4*Ind(2,3,x);
>
> plot2d(f(x),[x,-1,4]);
>
> HTH,
> -sen
>
>
> On Tue, 22 May 2007, Wolfgang Lindner wrote:
>
> > dear group,
> >
> > AFAIK I have seen plots of Riemann sums using Maxima - but I don't know anymore where it
> > was. I seek in the help file and the tutorials too, in vain.
> > Could anyone help me, please.
> >
> >
>
> --
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> | Sheldon E. Newhouse | e-mail: sen1 at math.msu.edu |
> | Mathematics Department | |
> | Michigan State University | telephone: 517-355-9684 |
> | E. Lansing, MI 48824-1027 USA | FAX: 517-432-1562 |
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