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selector behavior difference , Combinations or Arrangements list

asked 2020-06-07 01:39:52 -0500

ortollj gravatar image

updated 2020-06-08 02:18:32 -0500

HI

I opened this question first then I deleted it after a while now I re-open it because finally I do not know if its a pb or not!. sorry for my versatile behavior

Ubuntu 18.04 , SageMath 9.0 notebook

why if I uncoment line 3 of the code below, I get TraitError: Invalid selection: value not found. but code is ok if line 3 commented

anIndexL=[1..5]
anCoupleIndexL=Arrangements(anIndexL,2).list()
#anCoupleIndexL=Combinations(anIndexL,2).list()
show(anCoupleIndexL)

@interact
def _( nbStepMax=slider(1,20,1,default=20),anCouple = selector(anCoupleIndexL,default=anCoupleIndexL[0])):
    show(anCouple)

Arrangements return object parent is ๐™ฐ๐š›๐š›๐šŠ๐š—๐š๐šŽ๐š–๐šŽ๐š—๐š๐šœ ๐š˜๐š ๐š๐š‘๐šŽ ๐šœ๐šŽ๐š[๐Ÿท,๐Ÿธ,๐Ÿน,๐Ÿบ,๐Ÿป] ๐š˜๐š ๐š•๐šŽ๐š—๐š๐š๐š‘ ๐Ÿธ

As Combinations return object is a simple list.

anIndexL=[1..5]
anCoupleIndexL0=Arrangements(anIndexL,2).list()
anCoupleIndexL1=Combinations(anIndexL,2).list()
anCoupleIndexStrL0=[]
print("test parent couple for anCoupleIndexL0")

for an in anCoupleIndexL0 :
    anT=[]
    for e in an :
        show(e.parent())
    show(an.parent())
    anCoupleIndexStrL0.append(anT)

anCoupleIndexStrL1=[]
print("test parent couple for anCoupleIndexL1")
for an in anCoupleIndexL1 :
    anT=[]
    for e in an :
        show(e.parent())
    show(an.parent())
    anCoupleIndexStrL1.append(anT)
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Comments

strange if I not put default value, then the displayed choices are integers, not Integers couples. (if uncommented line 3)

ortollj gravatar imageortollj ( 2020-06-07 02:13:15 -0500 )edit

finally I did a wobbly (horrible ! ;-) ) workaround:

anIndexL=[1..5]
anCoupleIndexL0=Arrangements(anIndexL,2).list()
anCoupleIndexL1=Combinations(anIndexL,2).list()

anCoupleIndexL11=[]
print("change couple parent for anCoupleIndexL1")
for an in anCoupleIndexL1 :
        anCoupleIndexL11.append(Arrangements(an,2).list()[0])

show(anCoupleIndexL0)
show(anCoupleIndexL1)
show(anCoupleIndexL11)

@interact
def _( nbStepMax=slider(1,20,1,default=20),anCouple = selector(anCoupleIndexL11,default=anCoupleIndexL11[0])):
    show(anCouple)
ortollj gravatar imageortollj ( 2020-06-08 03:05:28 -0500 )edit

1 answer

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answered 2020-06-08 04:34:21 -0500

rburing gravatar image

From the documentation of selector:

Apart from a simple list, "values" can be given as a list of 2-tuples "(value, label)"

SageMath interprets your input list like this, and as a consequence it can't find the default value.

So for Combinations you have to do the following:

anIndexL=[1..5]
anCoupleIndexL=[(v,str(v)) for v in Combinations(anIndexL,2)]

@interact
def _( nbStepMax=slider(1,20,1,default=20),anCouple = selector(anCoupleIndexL,default=anCoupleIndexL[0][0])):
    show(anCouple)
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Comments

Thanks @rburing

ortollj gravatar imageortollj ( 2020-06-08 06:18:19 -0500 )edit

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Asked: 2020-06-07 01:39:52 -0500

Seen: 39 times

Last updated: Jun 08