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Re: need reducing of structures content output

From: Muthiah Annamalai
Subject: Re: need reducing of structures content output
Date: Sat, 10 Feb 2007 11:35:13 -0600

On Sat, 2007-02-10 at 04:15 -0800, address@hidden wrote:
> Hi all, 
> I have very big structures with multiple recursive fields.
> While MATLAB shows it content very well, like
> >>r
> r = 
>                    alg: 'Naum Z. Shor r-algorithm with AST & some
> modifications'
>              ralg_info: [1x134 char]
>                     df: [1000x1 double]
>               advanced: [1x1 struct]
>                 lambda: [4x1 double]
>                     mu: [8x1 double]
>     maxConstrViolation: 1.8025e-007
>              nFunEvals: 527
>             nGradEvals: 529
>                nCEvals: 529
>               nDCEvals: 529
>               nDHEvals: 529
>                   prob: [1x1 struct]
>                  nIter: 254
>         CPUTimeElapsed: 1.8594
>            TimeElapsed: 2.1400
>                 solver: 'ralg'
>                  istop: 4
>                    msg: 'norm(f[k+1]-f[k]) less than prob.TolFun'
>             isFeasible: 1
>                     xf: [1000x1 double]
>                     ff: 0.0265
>               randInfo: 'increasing prob.TolCon, prob.TolGrad, prob.TolFun,
> prob.TolX can be very helpfull!'
> Octave starts to give output all of fields recursively, i.e. 1000 coords of
> r.df & 1000 of r.xf, + recursive output of subfields r.advanced, r.prob, so
> it's VERY HARD to find usefull information, for example r.isFeasible.
Maybe you could still write a 'display' function for your structure, 
that can just show the useful parts of this structure. Is that possible?
I would like to think that, maybe it could work, even if you take it to
Matlab or something. 

> Espesially it's hard because normal terminal scrooling is absent (as a rule)
> in Octave text output terminals.
Formatting output yourself will free you from depending on default
behaviour of Matlab or Octave. This is a fix at the moment.

> I guess it will not take much efforts to implement MATLAB-like style of
> structure content output, isn't it?
No that its not impossible; just need to write some mroe new code in the
ov-struct.c/octave_struct::print_raw(...) as one wanted it to be.
It seems Octave, does a DFS print on this, and you want a Breadth first
print out?

Anyway, I would like some pretty-printer module, that can solve a whole
lot of issues, like this without actually touching any of the code in
Octave itself. I like the way Python pretty-printer works, and can
custom-format the lists (deeply-nested ones too), dict's(?) etc


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