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Re: Export of the integer value in fixedpoint toolbox

From: David Bateman
Subject: Re: Export of the integer value in fixedpoint toolbox
Date: Mon, 17 Jul 2006 12:31:14 +0200
User-agent: Mozilla Thunderbird 1.0.6-7.6.20060mdk (X11/20050322)

Jan Trmal wrote:

>I'm just wondering, if it is possible somehow gain the acces to the integer 
>representation of the fixed point number. It could be used for example during 
>the process of calculation of coefficient of some filter or so, for further 
>implementation in HW. I would highly appreciate it. Nowadays, I have to 
>perform all my calculations using IT++ or using matlab. 
>I'm aware, that can be realized just using expresion like a.x * (2^a.dec), but 
>I would have to take care about the sign of the variable, so it would be much 
>more comfortable to write for example x.i = 7; x = x* y; disp(x.i)
>I could try, if someone guides me, (I guess it could be relatively easy), but 
>I'm quite unexperienced in octave-C++ programming. 
>Thanks in advance for any comment on this.

The code for this is available to an oct-file in the getnumber method.
However it is not exposed to the script files. Adding appropriate code to

octave_base_fixed<ST>::dotref (const octave_value_list& idx)

to allow access to the integer representation should be all that is
needed. Something like

#define __FIXED_INT_VALUE_STR "i"  // added to fixed-def.h


  else if (nm == __FIXED_INT_VALUE_STR)
    retval(0) = octave_value (scalar.getnumber());

and similar code to octave_base_fixed_matrix<MT>::dotref (const
octave_value_list& idx). The GET_FIXED_PROP(getnumber) would also need
to be added to fixedComplex.h, etc. For cleanness the new case should be
treated in the subsasgn functions as well.

I'm sorry I really don't have time to add this feature now, but would
commit a patch if you are willing to work on one and test it.


David Bateman                                address@hidden
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 6 72 01 06 33 (Mob) 
91193 Gif-Sur-Yvette FRANCE                  +33 1 69 35 77 01 (Fax) 

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