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rlocus, bode, step... (Matlab-like programme for RISC OS-?)

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  rlocus, bode, step... (Matlab-like programme for RISC OS-?) Alexander Ausserstorfer <bavariasound@chiemgau-net.de> - 2012-01-21 20:16 -0800
    Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) "Terry Duell" <tduell@iinet.net.au> - 2012-01-23 08:18 +1100
      Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) "David Holden" <SpamBin@apdl.co.uk> - 2012-01-24 07:29 +0000
      Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) Alexander Ausserstorfer <bavariasound@chiemgau-net.de> - 2012-01-28 22:53 -0800
        Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) "Terry Duell" <tduell@iinet.net.au> - 2012-01-30 08:11 +1100
          Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) druck <news@druck.org.uk> - 2012-01-31 20:18 +0000
    Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) Mark Beerling <invalid@online.de> - 2012-01-23 19:29 +0100
      Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) Alexander Ausserstorfer <bavariasound@chiemgau-net.de> - 2012-01-28 22:55 -0800
    Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) "Terry Duell" <tduell@iinet.net.au> - 2012-01-30 08:57 +1100
      Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) Jim Lesurf <noise@audiomisc.co.uk> - 2012-01-30 09:16 +0000
        Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) Dave Higton <davehigton@dsl.pipex.com> - 2012-01-30 21:16 +0000
          Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) Jim Lesurf <noise@audiomisc.co.uk> - 2012-01-31 09:26 +0000
        Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2012-01-31 18:37 +0000
          Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) Jim Lesurf <noise@audiomisc.co.uk> - 2012-02-01 09:21 +0000
            Re: rlocus, bode, step... (Matlab-like programme for RISC OS-?) Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2012-02-01 20:47 +0000

#2853 — rlocus, bode, step... (Matlab-like programme for RISC OS-?)

Hi,

are there some programmes for RISC OS which can provide the commands
rlocus(...,...), bode(...,...), step(...,...) or create diagrammes for
that like Matlab (for Windows) can do do? Would be helpfull to me
these days.

Thanks,

Alex'

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#2857

On Sun, 22 Jan 2012 15:16:42 +1100, Alexander Ausserstorfer  
<bavariasound@chiemgau-net.de> wrote:

> Hi,
>
> are there some programmes for RISC OS which can provide the commands
> rlocus(...,...), bode(...,...), step(...,...) or create diagrammes for
> that like Matlab (for Windows) can do do? Would be helpfull to me
> these days.
>
There was a version of RLab ported to RISC OS some time back.
I used it quite a bit and was it was pretty good for what I needed.
I couldn't say if it had the specific functions you mention, but was able  
to generate it's output as either a Drawfile or a Sprite.
Not sure where you would go looking for it these days, and it may no  
longer be maintained.
If you don't have any luck, come back to me and I'll have a look through  
some archives to see if I can find it (I use Octave on Linux these days).

Cheers,
-- 
Cheers,
Terry

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#2864

On 22-Jan-2012, "Terry Duell" <tduell@iinet.net.au> wrote:

> There was a version of RLab ported to RISC OS some time back.
> I used it quite a bit and was it was pretty good for what I needed.
> I couldn't say if it had the specific functions you mention, but was able
>
> to generate it's output as either a Drawfile or a Sprite.
> Not sure where you would go looking for it these days, and it may no
> longer be maintained.

It's in the PD library on the APDL web site, though it is rather old and I
suspect there hasn't been a RISC OS update for very many years.

Unfortunately the manual consists of a series of Drawfiles created from TeX
pages using a special font so it's completely unreadable without the TeX
font used.

-- 
David Holden  -  APDL  -  <http://www.apdl.co.uk>

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#2934

On 22 Jan., 22:18, "Terry Duell" <tdu...@iinet.net.au> wrote:
> On Sun, 22 Jan 2012 15:16:42 +1100, Alexander Ausserstorfer
>
> <bavariaso...@chiemgau-net.de> wrote:
> > Hi,
>
> > are there some programmes for RISC OS which can provide the commands
> > rlocus(...,...), bode(...,...), step(...,...) or create diagrammes for
> > that like Matlab (for Windows) can do do? Would be helpfull to me
> > these days.
>
> There was a version of RLab ported to RISC OS some time back.
> I used it quite a bit and was it was pretty good for what I needed.
> I couldn't say if it had the specific functions you mention, but was able
> to generate it's output as either a Drawfile or a Sprite.
> Not sure where you would go looking for it these days, and it may no
> longer be maintained.
> If you don't have any luck, come back to me and I'll have a look through
> some archives to see if I can find it (I use Octave on Linux these days).

I have a version of RLab onto my HD, but it doesn't do the job.

A.

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#2945

Hullo Alexander,

On Sun, 29 Jan 2012 17:53:35 +1100, Alexander Ausserstorfer  
<bavariasound@chiemgau-net.de> wrote:


>
> I have a version of RLab onto my HD, but it doesn't do the job.

OK.
I found that the differences between RLab and Octave were quite minor, in  
that code for one system could be modified for the other relatively  
simply, so why not look at the Octave code for the functions you need and  
translate them into RLab functions?

Cheers,
-- 
Cheers,
Terry

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#2972

On 29/01/2012 21:35, Terry Duell wrote:
> Try these in your RISC OS RLab. They are from the current version of an
> RLabPlus toolbox.
> I haven't tried them, but they might help you do what you want to do.

Please DO NOT post attachments of any kind or size in text only news groups!

If you want to distribute files, put them on your own webspace and post 
a link.

---druck

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#2860

In message <0f3ca6bf-a067-4398-a404-0013ade545f1@c20g2000vbb.googlegro 
ups.com>
          Alexander Ausserstorfer <bavariasound@chiemgau-net.de> 
wrote:

> Hi,

> are there some programmes for RISC OS which can provide the commands
> rlocus(...,...), bode(...,...), step(...,...) or create diagrammes for
> that like Matlab (for Windows) can do do? Would be helpfull to me
> these days.

> Thanks,

> Alex'

Don't know about your requirements but you could look at laufox:

 http://www.luafox.com/index.php



-- 
Mark Beerling

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#2935

On 23 Jan., 19:29, Mark Beerling <inva...@online.de> wrote:
> In message <0f3ca6bf-a067-4398-a404-0013ade54...@c20g2000vbb.googlegro
> ups.com>
>           Alexander Ausserstorfer <bavariaso...@chiemgau-net.de>
> wrote:
>
> > Hi,
> > are there some programmes for RISC OS which can provide the commands
> > rlocus(...,...), bode(...,...), step(...,...) or create diagrammes for
> > that like Matlab (for Windows) can do do? Would be helpfull to me
> > these days.
> > Thanks,
> > Alex'
>
> Don't know about your requirements but you could look at laufox:
>
>  http://www.luafox.com/index.php

I already have Luafox (until 1.31). It doesn't do the job either.

A.

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#2946

On Sun, 22 Jan 2012 15:16:42 +1100, Alexander Ausserstorfer  
<bavariasound@chiemgau-net.de> wrote:

> Hi,
>
> are there some programmes for RISC OS which can provide the commands
> rlocus(...,...), bode(...,...), step(...,...) or create diagrammes for
> that like Matlab (for Windows) can do do? Would be helpfull to me
> these days.

Just another though...if the RLab stuff doesn't help, have you looked at  
python?
There is a port of python to RISC OS, and scipy might do a lot of the  
stuff you require, if that add-on is available/ported.


Cheers,
-- 
Cheers,
Terry

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#2947

In article <op.v8u8ldt6rs0ygh@localhost>, Terry Duell
<tduell@iinet.net.au> wrote:
> On Sun, 22 Jan 2012 15:16:42 +1100, Alexander Ausserstorfer
> <bavariasound@chiemgau-net.de> wrote:

> > Hi,
> >
> > are there some programmes for RISC OS which can provide the commands
> > rlocus(...,...), bode(...,...), step(...,...) or create diagrammes for
> > that like Matlab (for Windows) can do do? Would be helpfull to me
> > these days.

> Just another though...if the RLab stuff doesn't help, have you looked at
> python? There is a port of python to RISC OS, and scipy might do a lot
> of the stuff you require, if that add-on is available/ported.


I've been wondering if anyone could be bothered to define clearly what
"rlocus()", etc, actually *do*. Knowing that might make it possible to
suggest alternatives.

Slainte,

Jim

-- 
Please use the address on the audiomisc page if you wish to email me.
Electronics  http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Armstrong Audio  http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc  http://www.audiomisc.co.uk/index.html

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#2964

In message <525996e31anoise@audiomisc.co.uk>
          Jim Lesurf <noise@audiomisc.co.uk> wrote:

> I've been wondering if anyone could be bothered to define clearly what
> "rlocus()", etc, actually *do*. Knowing that might make it possible to
> suggest alternatives.

I think the clue is in the names: rlocus for plotting a root locus,
bode for doing a Bode plot... Control Engineering stuff.

Dave

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#2966

In article <eec3d85952.davehigton@dsl.pipex.com>, Dave Higton
<davehigton@dsl.pipex.com> wrote:
> In message <525996e31anoise@audiomisc.co.uk> Jim Lesurf
>           <noise@audiomisc.co.uk> wrote:

> > I've been wondering if anyone could be bothered to define clearly what
> > "rlocus()", etc, actually *do*. Knowing that might make it possible to
> > suggest alternatives.

> I think the clue is in the names: rlocus for plotting a root locus, bode
> for doing a Bode plot... Control Engineering stuff.

I did guess that 'bode' just meant plotting a bode approximation to the
real response, etc. But it wasn't clear why or how this was needed.

So if someone gives a mathematical definition, easy enough to duplicate
with almost any approach?

FWIW I asked because I've never bothered much with MatLab/Mathmatica/etc. I
just write what is required in 'C' or whatever seems appropriate. Then use
!DrawGen or !Tau if I want a graphic. However I can see that some very
complicated functions would be easier using a more 'high level' system.

FWIW2 I've often found that when someone asks you how to do "X", if you ask
them to explain why, and what they are *really* trying to do, it turns out
that their real requirement is something else. Often more easily acheived
some other way. The only way to tell is to have an explanation.

Slainte,

Jim

-- 
Please use the address on the audiomisc page if you wish to email me.
Electronics  http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Armstrong Audio  http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc  http://www.audiomisc.co.uk/index.html

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#2971

Jim Lesurf <noise@audiomisc.co.uk> wrote:

> I've been wondering if anyone could be bothered to define clearly what
> "rlocus()", etc, actually *do*. Knowing that might make it possible to
> suggest alternatives.

There's this thing called Google.  Asking it about "matlab rlocus" finds:

http://www.mathworks.co.uk/help/toolbox/control/ref/rlocus-root-locus.html


None of what's shown there means anything to me, but it might to you.  Maybe
it would be more useful if you told us what you want to know that's not
explained in the most obvious place to look?


-- 
Jeremy C B Nicoll - my opinions are my own.

Email sent to my from-address will be deleted. Instead, please reply
to newsreplyaaa@wingsandbeaks.org.uk replacing "aaa" by "284".  

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#2977

In article <mpro.lyoee5003xfbj026c@wingsandbeaks.org.uk.invalid>, Jeremy
Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> wrote:
> Jim Lesurf <noise@audiomisc.co.uk> wrote:

> > I've been wondering if anyone could be bothered to define clearly what
> > "rlocus()", etc, actually *do*. Knowing that might make it possible to
> > suggest alternatives.

> There's this thing called Google.  

There is also this thing called usenet. Where people can ask questions. And
when they want help may be willing to clarify their requirements to get a
better answer.

> Asking it about "matlab rlocus" finds:

> http://www.mathworks.co.uk/help/toolbox/control/ref/rlocus-root-locus.html


> None of what's shown there means anything to me, but it might to you. 

Yes, it is pretty much what I'd have expected. But cf below.

> Maybe it would be more useful if you told us what you want to know
> that's not explained in the most obvious place to look?

Sorry you didn't understand the rest of what I wrote in my earlier posting.
But the point was to clarify if something quite different might actually
serve the OP's actual requirement. And maybe give others who *don't* follow
the page reference to see if they could help. I can't tell that from the
above page since it tells us nothing about the OP's case. Hence this being
on usenet, and us not answering all questions with a lazy "use google". 
:-)

Slainte,

Jim

-- 
Please use the address on the audiomisc page if you wish to email me.
Electronics  http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Armstrong Audio  http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc  http://www.audiomisc.co.uk/index.html

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#2982

Jim Lesurf <noise@audiomisc.co.uk> wrote:

>In article <mpro.lyoee5003xfbj026c@wingsandbeaks.org.uk.invalid>, Jeremy
>Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> wrote:
>> Jim Lesurf <noise@audiomisc.co.uk> wrote:
>
>> > I've been wondering if anyone could be bothered to define clearly what
>> > "rlocus()", etc, actually *do*. Knowing that might make it possible to
>> > suggest alternatives.
>
>> There's this thing called Google.  
>
> There is also this thing called usenet. Where people can ask questions.

Absolutely.  But people who might consider spending their time answering
those questions might be much more inclined to do so if the OP has shown
some evidence of looking in the obvious place first AND then explaining why
the info in the obvious place isn't adequate.  It saves everyone else time.

> And when they want help may be willing to clarify their requirements to
> get a better answer.

Why would they not start off by being as clear as possible?


>> Asking it about "matlab rlocus" finds:
>
>>
http://www.mathworks.co.uk/help/toolbox/control/ref/rlocus-root-locus.html
>
>
>> None of what's shown there means anything to me, but it might to you. 
>
> Yes, it is pretty much what I'd have expected. But cf below.
>
> > Maybe it would be more useful if you told us what you want to know
> > that's not explained in the most obvious place to look?
>
> Sorry you didn't understand the rest of what I wrote in my earlier
> posting.

I think I understood it perfectly.  There's not much "the rest" in any case.
 The text of the post to which I replied was:

--------------------------------------------------------------------
I've been wondering if anyone could be bothered to define clearly what
"rlocus()", etc, actually *do*. Knowing that might make it possible to
suggest alternatives.
--------------------------------------------------------------------


The answer to the first sentence is at least initially provided by the
reference page I provided the link to.  It was easily locatable by you and
by anyone else thinking of spending their valuable time replying to your
post.  

The point I'm making is that it's not clear whether the info on that page is
sufficient to answer what you were asking.  Suppose you'd replied instead by
saying:

  I see there's an explanation of the use of 'rlocus' on <url>.
  I wonder if ... <whatever>
  
 
> But the point was to clarify if something quite different might actually
> serve the OP's actual requirement.

Yes I thought it might be. 

It seems to me that what you really wanted to know /wasn't what rlocus etc
'actually do'/ not least because your "Yes, it is pretty much what I'd have
expected." comment above suggests you already know what rlocus does.  

I think you wanted to know how what the OP's data described and what he
wanted to determine, so you could (perhaps) suggest some other mathematical
technique to determine that.  But it's not what you asked.




> And maybe give others who *don't* follow the page reference to see if they
> could help. 

Is there something missing from that sentence?

Why would someone following the discussion not follow any webpage references
that anyone has quoted? 




> I can't tell that from the above page since it tells us nothing about the
> OP's case.

Ah.  But you didn't ask about the OP's case, did you?
  

> Hence this being on usenet, ...

"Hence"?  How so?


> ... and us not answering all questions with a lazy "use google". :-)

It's not a lazy 'use google'.  Surely you can see the difference between
'use google' and 'use google, tell us what you found and why it's not
adequate and then phrase the question you're asking accordingly'?

Or even better: ask the right question in the first place.

-- 
Jeremy C B Nicoll - my opinions are my own.

Email sent to my from-address will be deleted. Instead, please reply
to newsreplyaaa@wingsandbeaks.org.uk replacing "aaa" by "284".  

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