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MathGroup Archive 2001

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Re: Fw: FORTRAN style, not OK?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26877] Re: Fw: FORTRAN style, not OK?
  • From: Albert Retey <albert.retey at visualanalysis.com>
  • Date: Fri, 26 Jan 2001 01:27:23 -0500 (EST)
  • Organization: Visual Analysis
  • References: <94m96g$3nd@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Toshiyuki (Toshi) Meshii" wrote:
> 
> Hello,
> 
> I found out a case in which I cannot directly use FORTRAN statement in
> Mathematica programming.
> Here is the case good in FORTRAN.
> 
> v=v-c
> 
> However in Mathematica, it seems that I have to use a trick like this.
> 
> temp=v;
> v=temp-c
> 
> Is there more smart way for doing the above?
> Please let me know.
> ___________________________________
> The final goal for me is to do the following.
> 
> Do[
>  Do[
>       v[i][j][k] = v[i][j][k] - va[j]
>       ,{j, 3}]
>     ,{k, 100}];
> 
> -Toshi

One more note: before trying to transfer FORTRAN code to Mathematica you
should
understand the difference between v[i][j], v[i,j] and v[[i,j]], since
the last form might represent much more what you expect a FORTRAN
"array" to be. On the other hand, using Mathematica lists is still quite
different from FORTRAN arrays, for example when it comes to
"initialization" or "declaration" issues. You will have to create a list
with the desired number of entries before you can reference to these
entries.

Probably you should really read some more literature on Mathematica,
that will also protect you from harsh dissappointement about execution
times...

Albert
--
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