[Help-gnucap] Re: using a pipe to make gnucap accept input from other program

[Hugo Coolens]

al davis wrote:
> On Thursday 04 January 2007 04:35, Hugo Coolens wrote:
>
> > > In particular .. What does it do, or claim to do?   What
> > > does its output look like?  (maybe include it in your mail)
> > > just how doesn't it work? etc...
> >
> > makespicefile is just a little bash-script I wrote. It just
> > outputs a regular spice file. I just regret I  can't use it
> > with gnucap the way I use it with regular Spice using a pipe:
> >
> > makespicefile | spice
> >
> > works but
> >
> > makespicefile | gnucap
> >
> > does not work
>
>
> As I said before, you need to give more information if you want 
> us to help you.  Gnucap is not Spice.  It is not 100% 
> compatible.  Gnucap has some features Spice does not have,
Can you give me some examples of those features?
 and
> Spice has some features gnucap does not have.  You could have 
> the same problem moving between versions of spice.
> Maybe you could post your script, some data, and what it does.  
> In your mail, put it in line as plain text, not as an 
> attachment.  Attachments really mess up the digest and 
> archives.
Here is the script (it produces cascaded normalized RC-sections)
Save it to a file called makespicefile, chmod 755 makespicefile and try 
./makespicefile 2
then you see the inputfile for an rc-filter with two sections
if you execute ./makespicefile 2 |spice you'll see the result 
immediately. Gnucap however does not accept the standard unix way to 
handle pipes unfortunately. There I have to use files as in intermediate 
step:
./makespicefile 2 >input.cir
gnucap -b input.cir

when you start making real large circuits this is not elegant to do and 
a waste of time and resources.
The script can be used to produce real large circuits to compare 
different spice-versions (accuracy, maximum number of nodes ...)


The script:

#! /bin/bash
#use: makespicefile number_of_sections
echo 'test'
echo 'vin 1 0 ac 1'
for ((i=1; i<$1+1 ; i++))
    do
      echo r$i $i $((i+1)) '1'
      echo c$i $((i+1)) 0  '1'
    done
echo '.print ac' 'v('$i')'
#print-statement _before_ analysis necessary for gnucap
echo '.options numdgt=7'
echo '.ac dec 20 10m 1000 basic'
echo '.end'