python question

[luis jure]

hello list, i hope this is not completely OT, since python is so well
integrated into csound.

be warned that i'm a complete beginner, i'm just trying to teach myself the
basics reading a few tutorials.

here's my question: i defined a function with a list as its only
parameter, and at certain point i need to retrieve the actual name of the
list passed as argument.

for example:

def my_function(my_list):
        # some code processing the list

when i call my_function(foo), foo being a list, i need to print the name
"foo" as a string, but i have no idea how. any hints from the gurus?

thank you,

lj


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[Olivier Bélanger]

Hi Luis,

There is no easy way to retrieve a variable's name as a string. What I would do in this case is to create my own class
inherited from the class "list" and add an attribute for the name of the variable:

class MyList(list):
    def __init__(self, name, val):
        list.__init__(self, val)
        self.__name__ = name

Now, when you create your list, you give the actual list as "val" argument and the name of the variable, as a string, to "name":

foo = MyList("foo", [1,2,3,4,5])

In your function, you can use your variable like a normal list and you can print the content of the attribute __name__:

def some_function(l):
    print "value =", l
    print "name =", l.__name__

some_function(foo)

value = [1, 2, 3, 4, 5]
name = foo

Hope that helps,

Olivier

2012/2/3 luis jure <[hidden email]>

hello list, i hope this is not completely OT, since python is so well
integrated into csound.

be warned that i'm a complete beginner, i'm just trying to teach myself the
basics reading a few tutorials.

here's my question: i defined a function with a list as its only
parameter, and at certain point i need to retrieve the actual name of the
list passed as argument.

for example:

def my_function(my_list):
       # some code processing the list

when i call my_function(foo), foo being a list, i need to print the name
"foo" as a string, but i have no idea how. any hints from the gurus?

thank you,

lj


Send bugs reports to the Sourceforge bug tracker
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[Dennis Raddle]

You should probably tell us more about your problem because it is very likely you are thinking about this problem in a way that is not natural to the language.

Dennis

On Fri, Feb 3, 2012 at 5:24 PM, luis jure <[hidden email]> wrote:

hello list, i hope this is not completely OT, since python is so well
integrated into csound.

be warned that i'm a complete beginner, i'm just trying to teach myself the
basics reading a few tutorials.

here's my question: i defined a function with a list as its only
parameter, and at certain point i need to retrieve the actual name of the
list passed as argument.

for example:

def my_function(my_list):
       # some code processing the list

when i call my_function(foo), foo being a list, i need to print the name
"foo" as a string, but i have no idea how. any hints from the gurus?

thank you,

lj


Send bugs reports to the Sourceforge bug tracker
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Discussions of bugs and features can be posted here
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[luis jure]

on 2012-02-04 at 00:32 Dennis Raddle wrote:

>You should probably tell us more about your problem because it is very
>likely you are thinking about this problem in a way that is not natural to
>the language.

well, independently of the language, i want to perform a certain task,
that i tried to describe in my previous mail: i have a list of values, and
i need a function that processes the list in some way and outputs a string
of text. this string has to include the name of the list. i prefer to
think about this problem in general terms: i could be processing text to
generate csound scores, or lilypond code, or whatever. apparently, there's
no direct and trivial way to do this in python. i searched quite a lot
before asking on the list, and olivier's answer seems to confirm my
impression.

best,

lj


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[luis jure]

on 2012-02-03 at 21:01 Olivier Bélanger wrote:

>There is no easy way to retrieve a variable's name as a string.

i see...

well, thanks a lot olivier for your example, it was very instructive. but
since it's not easy to retrieve the name of the variable, i think i might
just as well pass two arguments to the function: the list, and a string
with its name. and that's that... not very elegant, but it'll do.

best,

lj


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[Richard Dobson]

On 04/02/2012 10:57, luis jure wrote:

>
> on 2012-02-03 at 21:01 Olivier Bélanger wrote:
>
>> There is no easy way to retrieve a variable's name as a string.
>
> i see...
>
> well, thanks a lot olivier for your example, it was very instructive. but
> since it's not easy to retrieve the name of the variable, i think i might
> just as well pass two arguments to the function: the list, and a string
> with its name. and that's that... not very elegant, but it'll do.
>

The namespaces problem makes this more than a little tricky (same names
used in different scopes or namespaces - think of how many places you
may be using the name 'i'). It is discussed (with proposed solution) here:

http://pythonic.pocoo.org/2009/5/30/finding-objects-names

Which is enough to suggest to me that your solution combining a list
with its name really is the most elegant option.

Richard Dobson



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[luis jure]

on 2012-02-04 at 12:28 Richard Dobson wrote:

>Which is enough to suggest to me that your solution combining a list
>with its name really is the most elegant option.

by now i'm totally convinced of that. mainly because at my newbie stage,
i'm in no condition to even think of anything more sophisticated than
that...

thanks to all that responded! i think it would be a good idea to subscribe
to a python-specific mailing list. i'm having great fun learning the
language, and i'm liking it very much so far. this is the first problem i
encounter where i would have wished for a more direct and elegant solution.

best,


lj



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[Olivier Bélanger]

A simpler solution could be to put your name into the list and split it inside your function:

foo = ["foo", 1, 2, 3, 4, 5]

def my_func(lst):
    name = lst[0]
    data = lst[1:]

Olivier

2012/2/4 luis jure <[hidden email]>

on 2012-02-04 at 12:28 Richard Dobson wrote:

>Which is enough to suggest to me that your solution combining a list
>with its name really is the most elegant option.

by now i'm totally convinced of that. mainly because at my newbie stage,
i'm in no condition to even think of anything more sophisticated than
that...

thanks to all that responded! i think it would be a good idea to subscribe
to a python-specific mailing list. i'm having great fun learning the
language, and i'm liking it very much so far. this is the first problem i
encounter where i would have wished for a more direct and elegant solution.

best,


lj

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If you need to have more list why not using a dictionary of lists where key is the name and value is the list?

lists = {"list1" : [0,1,2] , "list2" : [2, 3 ,4]}

----Messaggio originale----
Da: [hidden email]
Data: 04/02/2012 15.12
A: <[hidden email]>
Ogg: Re: [Csnd] python question

A simpler solution could be to put your name into the list and split it inside your function:

foo = ["foo", 1, 2, 3, 4, 5]

def my_func(lst):
    name = lst[0]
    data = lst[1:]

Olivier

2012/2/4 luis jure <[hidden email]>

on 2012-02-04 at 12:28 Richard Dobson wrote:

>Which is enough to suggest to me that your solution combining a list
>with its name really is the most elegant option.

by now i'm totally convinced of that. mainly because at my newbie stage,
i'm in no condition to even think of anything more sophisticated than
that...

thanks to all that responded! i think it would be a good idea to subscribe
to a python-specific mailing list. i'm having great fun learning the
language, and i'm liking it very much so far. this is the first problem i
encounter where i would have wished for a more direct and elegant solution.

best,


lj

Send bugs reports to the Sourceforge bug tracker
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[Dennis Raddle]

Hi Luis,
What I mean is that it's not very common to organize python code in such a way that you need the name of a variable at runtime.

Let's say you had this function:

def process(inputData):
  result1 = do_some_stuff(inputData)
  output_the_data(result1)
  result2 = some_more_processing(result1)
  output_the_data(result2)

The variable names "inputData", "result1", "result2" describe the way those variables relate to the structure of the code *in the local function*. A principle called "encapsulation" means that you want different local areas to know as little about the other parts of the program as possible. So the function "process" knows something about the structure of the data, but it has no need to know from where that data originated. The variables names usually should not be tied to any higher meaning of the data but rather to their function *in a local area*.

The dictionary solution proposed by vallste (as well as Olivier's solution of annotating the data as a list element) are better ways to organize the code.

Let me clarify-- the principle of "encapsulation" is used to make code more robust-- less likely to have bugs, easier to maintain and easier to analyze/understand. It isn't necessarily faster to write the code at first, but it saves a lot of time in the long run.

Dennis

On Sat, Feb 4, 2012 at 2:56 AM, luis jure <[hidden email]> wrote:

on 2012-02-04 at 00:32 Dennis Raddle wrote:

>You should probably tell us more about your problem because it is very
>likely you are thinking about this problem in a way that is not natural to
>the language.

well, independently of the language, i want to perform a certain task,
that i tried to describe in my previous mail: i have a list of values, and
i need a function that processes the list in some way and outputs a string
of text. this string has to include the name of the list. i prefer to
think about this problem in general terms: i could be processing text to
generate csound scores, or lilypond code, or whatever. apparently, there's
no direct and trivial way to do this in python. i searched quite a lot
before asking on the list, and olivier's answer seems to confirm my
impression.

best,

lj


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[DavidW]

<a href="xhttp://pythonic.pocoo.org/2009/5/30/finding-objects-names">xhttp://pythonic.pocoo.org/2009/5/30/finding-objects-names

On 04/02/2012, at 9:57 PM, luis jure wrote:

on 2012-02-03 at 21:01 Olivier Bélanger wrote:

There is no easy way to retrieve a variable's name as a string.

i see...

well, thanks a lot olivier for your example, it was very instructive. but
since it's not easy to retrieve the name of the variable, i think i might
just as well pass two arguments to the function: the list, and a string
with its name. and that's that... not very elegant, but it'll do.

best,

lj


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Discussions of bugs and features can be posted here
To unsubscribe, send email [hidden email] with body "unsubscribe csound"

________________________________________________

Dr David Worrall.

- Experimental Polymedia:   worrall.avatar.com.au

- Sonification: www.sonification.com.au

- Education for Financial Independence: www.mindthemarkets.com.au

[Dennis Raddle]

On Sat, Feb 4, 2012 at 2:57 AM, luis jure <[hidden email]> wrote:

on 2012-02-03 at 21:01 Olivier Bélanger wrote:

>There is no easy way to retrieve a variable's name as a string.

i see...

well, thanks a lot olivier for your example, it was very instructive. but
since it's not easy to retrieve the name of the variable, i think i might
just as well pass two arguments to the function: the list, and a string
with its name. and that's that... not very elegant, but it'll do.

As I explained a bit in my other post, actually it *IS* more elegant because it provides greater encapsulation. One of these days you are going to modify this code and discover you need a new system for naming and organizing these arrays, and if you tied their function to their variable names you're going to find you have to modify a lot of the code. But if don't tie their function to their variable names it will be easier to modify.

Dennis

[luis jure]

on 2012-02-05 at 12:08 Dennis Raddle wrote:

>As I explained a bit in my other post, actually it *IS* more elegant

yes, i realized that already, it's simpler and more flexible.

thank you dennis, and all of you who took your time to answer my question.




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[andreas russo]

Hello folks,

as a Csounder, I find the streaming phase vocoder opcodes to be an amazing musical tool.
in a conversation with my father, the Hilbert-Huang transform popped up, and I started thinking about the musical implications it might have.
unlike the FFT, HHT "[...] is designed to work well for data that are nonstationary and nonlinear."

http://en.wikipedia.org/wiki/Hilbert%E2%80%93Huang_transform

that line right there clicked something in my brain.
anybody knows of musical applications of the HHT or even of opcodes under developement?

cheers!

Andreas

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[Victor Lazzarini]

Well, the Hilbert transform part of this can be performed with
http://www.csounds.com/manual/html/hilbert.html

Victor
On 5 Feb 2012, at 20:45, andreas russo wrote:

> Hello folks,
>
> as a Csounder, I find the streaming phase vocoder opcodes to be an amazing musical tool.
> in a conversation with my father, the Hilbert-Huang transform popped up, and I started thinking about the musical implications it might have.
> unlike the FFT, HHT "[...] is designed to work well for data that are nonstationary and nonlinear."
>
> http://en.wikipedia.org/wiki/Hilbert%E2%80%93Huang_transform
>
> that line right there clicked something in my brain.
> anybody knows of musical applications of the HHT or even of opcodes under developement?
>
> cheers!
>
> Andreas
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email [hidden email] with body "unsubscribe csound"
>

Dr Victor Lazzarini
Senior Lecturer
Dept. of Music
NUI Maynooth Ireland
tel.: [phone]
Victor dot Lazzarini AT nuim dot ie





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[Richard Dobson]

On first glance, it looks like it would not fit a pvs style
implementation as it appears not to have an inverse (it is described as
an adaptive and  "empirically based" algorithm, not as a formula as
such); it might be more applicable to  a partial-tracking style of
analysis. I am not competent to follow the maths, but a related issue is
whether it can be implemented in the pvoc manner of short-time
overlapping frames. While it is called a transform, which suggests some
relation to the FFT and HT (etc), it seems really to be a decomposition
(into amp/freq tracks plus a residual), a different model altogether.


Richard Dobson


On 05/02/2012 20:45, andreas russo wrote:

> Hello folks,
>
> as a Csounder, I find the streaming phase vocoder opcodes to be an amazing musical tool.
> in a conversation with my father, the Hilbert-Huang transform popped up, and I started thinking about the musical implications it might have.
> unlike the FFT, HHT "[...] is designed to work well for data that are nonstationary and nonlinear."
>
> http://en.wikipedia.org/wiki/Hilbert%E2%80%93Huang_transform
>
> that line right there clicked something in my brain.
> anybody knows of musical applications of the HHT or even of opcodes under developement?
>
> cheers!
>
> Andreas
>
> Send bugs reports to the Sourceforge bug tracker
>              https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email [hidden email] with body "unsubscribe csound"
>
>

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[Dennis Raddle]

On Sun, Feb 5, 2012 at 12:45 PM, luis jure <[hidden email]> wrote:

on 2012-02-05 at 12:08 Dennis Raddle wrote:

>As I explained a bit in my other post, actually it *IS* more elegant

yes, i realized that already, it's simpler and more flexible.

thank you dennis, and all of you who took your time to answer my question.

Okay, sorry I posted again when you already understood it.

I just want to see a beginning programmer headed in the right direction! Programming is a barrel of fun.. you'll probably feel very satisfied as you come to grasp the organizational concepts. Programming -- done well, that is -- is an exercise in organization and thinking clearly about your problem.

Dennis

[Dr. Richard Boulanger-2]

it would be wonderful to have this as an opcode.

what about wavelets?

Csound 6?

___________________________________

Dr. Richard Boulanger, Ph.D.

Professor of Electronic Production and Design

Professional Writing and Music Technology Division

Berklee College of Music

1140 Boylston Street

Boston, MA 02215-3693

617-747-2485 (office)

774-488-9166 (cell)

[hidden email]

http://csounds.com/boulanger

____________________________________

http://csounds.com

http://csoundforlive.com

____________________________________

http://csounds.com/mathews

____________________________________

On Feb 5, 2012, at 6:26 PM, Richard Dobson wrote:

On first glance, it looks like it would not fit a pvs style implementation as it appears not to have an inverse (it is described as an adaptive and  "empirically based" algorithm, not as a formula as such); it might be more applicable to  a partial-tracking style of analysis. I am not competent to follow the maths, but a related issue is whether it can be implemented in the pvoc manner of short-time overlapping frames. While it is called a transform, which suggests some relation to the FFT and HT (etc), it seems really to be a decomposition (into amp/freq tracks plus a residual), a different model altogether.


Richard Dobson


On 05/02/2012 20:45, andreas russo wrote:

Hello folks,

as a Csounder, I find the streaming phase vocoder opcodes to be an amazing musical tool.

in a conversation with my father, the Hilbert-Huang transform popped up, and I started thinking about the musical implications it might have.

unlike the FFT, HHT "[...] is designed to work well for data that are nonstationary and nonlinear."

http://en.wikipedia.org/wiki/Hilbert%E2%80%93Huang_transform

that line right there clicked something in my brain.

anybody knows of musical applications of the HHT or even of opcodes under developement?

cheers!

Andreas

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[Nick Suda]

Relevant:

Found this thread in the Cycling forum when I was doing some research:

http://www.cycling74.com/forums/topic.php?id=13929

User maxplanck makes a convincing argument for Hilbert being the basis of Peter Neubacker's algorithm used in DNA (Melodyne) being Hilbert.

So you're definitely on the same wavelength (no pun intended) in terms of Fourier alternatives.

-Nick

On Sun, Feb 5, 2012 at 5:26 PM, Dr. Richard Boulanger <[hidden email]> wrote:

it would be wonderful to have this as an opcode.

what about wavelets?

Csound 6?

___________________________________

Dr. Richard Boulanger, Ph.D.

Professor of Electronic Production and Design

Professional Writing and Music Technology Division

Berklee College of Music

1140 Boylston Street

Boston, MA 02215-3693

<a href="tel:[phone]" value="[phone]" target="_blank">617-747-2485 (office)

<a href="tel:[phone]" value="[phone]" target="_blank">774-488-9166 (cell)

[hidden email]

http://csounds.com/boulanger

____________________________________

http://csounds.com

http://csoundforlive.com

____________________________________

http://csounds.com/mathews

____________________________________

On Feb 5, 2012, at 6:26 PM, Richard Dobson wrote:

On first glance, it looks like it would not fit a pvs style implementation as it appears not to have an inverse (it is described as an adaptive and  "empirically based" algorithm, not as a formula as such); it might be more applicable to  a partial-tracking style of analysis. I am not competent to follow the maths, but a related issue is whether it can be implemented in the pvoc manner of short-time overlapping frames. While it is called a transform, which suggests some relation to the FFT and HT (etc), it seems really to be a decomposition (into amp/freq tracks plus a residual), a different model altogether.


Richard Dobson


On 05/02/2012 20:45, andreas russo wrote:

Hello folks,

as a Csounder, I find the streaming phase vocoder opcodes to be an amazing musical tool.

in a conversation with my father, the Hilbert-Huang transform popped up, and I started thinking about the musical implications it might have.

unlike the FFT, HHT "[...] is designed to work well for data that are nonstationary and nonlinear."

http://en.wikipedia.org/wiki/Hilbert%E2%80%93Huang_transform

that line right there clicked something in my brain.

anybody knows of musical applications of the HHT or even of opcodes under developement?

cheers!

Andreas

Send bugs reports to the Sourceforge bug tracker

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--
---------------------------------------------------
Nick Suda ¦ [hidden email]
Renton, WA ¦ [phone]
http://www.nicksuda.com

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