list of functions question

[val bykoski]

Hi The List:
I have a modeling app where i'm detecting events (in temporal
dynamics) applying a set of (boolean) functions - kind of:

event_list = "f1 f2 etc".split() # each fi detects a specific event
i have defs for functions fi, or simple boolean expressions for each, so
that evList is a list of defs or boolean expressions
for ev in evList:
if ev: # this supposedly is a call ev(t)
# doing smth with the event

I didn't succeed, though, (blindly) trying various options.
I thought/tried "apply()" but couldn't get it work.
I'd appreciate pointers to how to handle this kind of
functions or events lists (or objects?) and how to call those
functions in a loop.
thanks,val

[Tim Roberts]

Re: list of functions question

val bykoski <val@vtek.com > wrote:[color=blue]
>
>Hi The List:
> I have a modeling app where i'm detecting events (in temporal
>dynamics) applying a set of (boolean) functions - kind of:
>
>event_list = "f1 f2 etc".split() # each fi detects a specific event
>i have defs for functions fi, or simple boolean expressions for each, so
>that evList is a list of defs or boolean expressions
>for ev in evList:
> if ev: # this supposedly is a call ev(t)
> # doing smth with the event
>
> I didn't succeed, though, (blindly) trying various options.
>I thought/tried "apply()" but couldn't get it work.
>I'd appreciate pointers to how to handle this kind of
>functions or events lists (or objects?) and how to call those
>functions in a loop.[/color]

If you hadn't tried the string shortcut, it would have worked:

event_list = [f1, f2, etc]

As it is, event_list is a list of strings, not a list of functions.

Then, when you want to call it, remember that it has to be treated like a
function:

for ev in event_list:
if ev(t):
pass

If you REALLY need the list of functions to come from a string, you can
also do:

event_list = [eval(f) for f in "f1 f2 etc".split()]
--
- Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.

[John Machin]

Re: list of functions question

On 27/04/2006 10:38 AM, val bykoski wrote:[color=blue]
> Hi The List:
> I have a modeling app where i'm detecting events (in temporal
> dynamics) applying a set of (boolean) functions - kind of:
>
> event_list = "f1 f2 etc".split() # each fi detects a specific event
> i have defs for functions fi, or simple boolean expressions for each, so
> that evList is a list of defs or boolean expressions
> for ev in evList:
> if ev: # this supposedly is a call ev(t)
> # doing smth with the event
>
> I didn't succeed, though, (blindly) trying various options.
> I thought/tried "apply()" but couldn't get it work.
> I'd appreciate pointers to how to handle this kind of
> functions or events lists (or objects?) and how to call those
> functions in a loop.
> thanks,val[/color]

This may be something like what you are trying to achieve:

# untested
def fx(arg):
pass
def fy(arg):
pass
def fdefault(arg):
pass

funcmap = {
'x1': fx,
'x2': fx,
'y' : fy,
}

eventlist = "y x2 x2 x1 y".split()
for ev in eventlist:
efunc = funcmap.get(ev, fdefault)
if efunc(t): # what is t????
# do something

[Kent Johnson]

Re: list of functions question

val bykoski wrote:[color=blue]
> Hi The List:
> I have a modeling app where i'm detecting events (in temporal
> dynamics) applying a set of (boolean) functions - kind of:
>
> event_list = "f1 f2 etc".split() # each fi detects a specific event
> i have defs for functions fi, or simple boolean expressions for each, so
> that evList is a list of defs or boolean expressions
> for ev in evList:
> if ev: # this supposedly is a call ev(t)
> # doing smth with the event[/color]

# Make a list of the actual functions, not their names
# For the events that are expressions, encapsulate them in functions
event_list = [f1, f2, etc]

# Call each one:
for ev in event_list:
if ev(t):
# do something

Kent

[val@vtek.com]

Re: list of functions question

John Machin wrote:[color=blue]
> On 27/04/2006 10:38 AM, val bykoski wrote:[color=green]
> > Hi The List:
> > I have a modeling app where i'm detecting events (in temporal
> > dynamics) applying a set of (boolean) functions - kind of:
> >
> > event_list = "f1 f2 etc".split() # each fi detects a specific event
> > i have defs for functions fi, or simple boolean expressions for each, so
> > that evList is a list of defs or boolean expressions
> > for ev in evList:
> > if ev: # this supposedly is a call ev(t)
> > # doing smth with the event
> >
> > I didn't succeed, though, (blindly) trying various options.
> > I thought/tried "apply()" but couldn't get it work.
> > I'd appreciate pointers to how to handle this kind of
> > functions or events lists (or objects?) and how to call those
> > functions in a loop.
> > thanks,val[/color]
>
> This may be something like what you are trying to achieve:
>
> # untested
> def fx(arg):
> pass
> def fy(arg):
> pass
> def fdefault(arg):
> pass
>
> funcmap = {
> 'x1': fx,
> 'x2': fx,
> 'y' : fy,
> }
>
> eventlist = "y x2 x2 x1 y".split()
> for ev in eventlist:
> efunc = funcmap.get(ev, fdefault)
> if efunc(t): # what is t????
> # do something[/color]

John,
Thanks alot. It does work with the fx, fy,etc as (boolean)
expressions.
And it is faster vs. using defs.
Thanks again, the great list...
Val

[val@vtek.com]

Re: list of functions question

Hi Kent,
Thanks. Great help. It does work now,
and with expressions as well.
my very best,
Val

[val@vtek.com]

Re: list of functions question

Tim,
Greatly appreciate your help. You are right - the functions work
from the list; i don't actually need the string with events.
Thanks again - great list and great people...
Val