Richard Fateman [09/10/03 20:48 -0700]:
> Not a CLISP issue. Lukic's suggestion is not legal syntax
> in any version of maxima.
> he said "something like ..."
> RJF
>
Professor Fateman is right. I apologize. I was focused on whether
loop or no loop was going to work. I actually used
f[i](x):=f[i-1](x) ...
but in writing the e-mail I just copied the line f[i+1](x) ... from
Richard Noel's original message.
Milan Lukic
> Billinghurst, David (CALCRTS) wrote:
>
> >Interesting. There may be a clisp issue at work here.
> >With maxima-5.9.0 / clisp-2.27 on irix6.5 I see
> >
> >
> >(C1) f[0](x):=0;
> >(D1) f (x) := 0
> > 0
> >(C2) f[i+1](x):=f[i](x);
> >
> >*** - STRING: argument ((MPLUS) |$i| 1) should be a string, a symbol or a
> >character
> >The following restarts are available:
> >R1 = Macsyma top-level
> >
> >1. Break [1]>
> >
> >
> >.... but ....
> >
> >(C2) f[0](x):=0;
> >(D2) f (x) := 0
> > 0
> >(C3) f[i](x):=f[i-1](x);
> >(D3) f (x) := f (x)
> > i i - 1
> >
> >
> >
> >-----Original Message-----
> >From: Milan Lukic [mailto:lmilan at shell]
> >Sent: Friday, 10 October 2003 11:59 AM
> >To: Maxima@www.ma.utexas.edu
> >Subject: Re: [Maxima] another question
> >
> >
> >richard noel fell [09/10/03 16:22 -0400]:
> >
> >
> >>I would like to calculate the partial sums of a fourier series and have
> >>maxima do the work. So, I define an array of functions (well, that is my
> >>intent)
> >>f[0](x):=0;
> >>for i:1 thru 10 do
> >>f[i+1](x):=f[i](x)+(-1)^i/(2*i+1)^2*sin(%pi*x/(2*i+1)^2). Then, I would
> >>plot the partial sums via plot2d.
> >>
> >>
> >>
> >
> >Have you tried something like:
> >
> >f[0](x):=0;
> >f[i+1](x):=f[i](x)+(-1)^i/(2*i+1)^2*sin(%pi*x/(2*i+1)^2)$
> > In other words - no loop!
> > Then, define a partial sum, say
> >ss[3](x):=sum(f[i](x),i,0,3);
> > end then plot:
> >plot2d('(ss[3](x)),[x,-3,3]);
> >
> >It worked for me.
> >
> >Milan Lukic
> >
> >
> >
> >>However, both commercial Macsyma and maxima, while perfectly happy with
> >>a subscripted definition such as f[0](x):=x, they complain when I try to
> >>do this in a for loop. maxima gives the error message:
> >>ERROR ((MPLUS) |$i| 1) is not of type STRING
> >>
> >>Is there a way to overcome this difficulty? Thanks,
> >>Dick Fell
> >>
> >>_______________________________________________
> >>Maxima mailing list
> >>Maxima@www.math.utexas.edu
> >>http://www.math.utexas.edu/mailman/listinfo/maxima
> >>
> >>
> >>
> >
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> >
> >
>
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