Re: [sage-support] what am I missing?

2023-04-13 Thread John H Palmieri 
This looks like the issue reported at 
https://github.com/sagemath/sage/issues/34233.

-- 
John


On Thursday, April 13, 2023 at 2:13:44 PM UTC-7 Fernando Gouvea wrote:

> That seems right. Plotting x^6/(1-x)^7 shows the error, but x^5/(1-x)^6 
> does not. And
>
> .9^6/.1^7 = 5.314411e6
>
> .9^5/.1^6 = 590490.1
>
> So it seems that there should be a 1e6 label that is somehow not appearing.
>
> Fernando
> On 4/13/2023 4:33 PM, William Stein wrote:
>
> I tried "plot(g(x),(0.8,0.9))" and it says "1e10" in the upper left of the 
> plot, suggesting it is labeling the y axis with the labels divided by 1e10, 
> and maybe somehow that 1e10 gets cut off in your example. See below.  The 
> default plotting in Sage got implemented as follows: In 2006 I said to Alex 
> Clemesha (who had just got his undergrad degree), "implement 2d plotting 
> for Sage that has the same API and look as mathematica, but translated to 
> be pythonic", and he did that.  So whatever is happening here with the 
> labels changing, might be just copying what "Mathematica in 2006" did...
>
> [image: image.png]
>
> On Thu, Apr 13, 2023 at 1:22 PM Fernando Gouvea  wrote:
>
>> I get the same results in 9.2 and 9.6.
>>
>> Fernando
>> On 4/13/2023 4:17 PM, William Stein wrote:
>>
>> Hi,
>>
>> I think I randomly ran into this same thing with sage-9.8 this week too.  
>> My guess is that there is some sort of overflow bug in the computation of 
>> the y-axis labels.  It's probably one of the most severe bugs in sage ever, 
>> since it is so likely to be randomly misleading...
>>
>> On Thu, Apr 13, 2023 at 1:15 PM Fernando Gouvea  
>> wrote:
>>
>>> I must be missing something here...
>>>
>>> sage: g(x)=x^10/(1-x)^11
>>> sage: plot(g(x),(0,0.9))
>>>
>>> sage: g(0.7)
>>> 15945.8104850773 <(810)%20485-0773>
>>>
>>> What's wrong?
>>>
>>> Fernando
>>>
>>> -- 
>>> =
>>> Fernando Q. Gouvea http://www.colby.edu/~fqgouvea
>>> Carter Professor of Mathematics
>>> Dept. of Mathematics
>>> Colby College  
>>> 5836 Mayflower Hill
>>> Waterville, ME 04901   
>>>
>>> Further Pronunciation Advice
>>>
>>> That math whiz Euler (Leonhard)
>>> Had a great mind, but a peon heart.
>>> His life was spare and frugal,
>>> His sex life strictly conjugal.
>>>
>>>   -- John Derbyshire
>>>
>>>
>>> -- 
>>> You received this message because you are subscribed to the Google 
>>> Groups "sage-support" group.
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>>>  
>>> 
>>> .
>>>
>>
>>
>> -- 
>> William (http://wstein.org)
>> -- 
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>>  
>> 
>> .
>>
>> -- 
>> =
>> Fernando Q. Gouvea http://www.colby.edu/~fqgouvea
>> Carter Professor of Mathematics
>> Dept. of Mathematics
>> Colby College  
>> 5836 Mayflower Hill
>> Waterville, ME 04901   
>>
>> Flagrant breaches of good breeding, like singing in the streets
>> or any other gross misconduct, are easily apparent and do not
>> call especially for admonition and instruction.
>>   -- Cicero, De Oficiis
>>
>>
>> -- 
>> You received this message because you are subscribed to the Google Groups 
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>> To view this discussion on the web visit 
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>>  
>> 
>> .
>>
>
>
> -- 
> William (http://wstein.org)
> -- 
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>  
>

Re: [sage-support] what am I missing?

2023-04-13 Thread Fernando Gouvea 

I get the same results in 9.2 and 9.6.

Fernando

On 4/13/2023 4:17 PM, William Stein wrote:

Hi,

I think I randomly ran into this same thing with sage-9.8 this week 
too.  My guess is that there is some sort of overflow bug in the 
computation of the y-axis labels.  It's probably one of the most 
severe bugs in sage ever, since it is so likely to be randomly 
misleading...


On Thu, Apr 13, 2023 at 1:15 PM Fernando Gouvea  
wrote:


I must be missing something here...

sage: g(x)=x^10/(1-x)^11
sage: plot(g(x),(0,0.9))

sage: g(0.7)
15945.8104850773

What's wrong?

Fernando

-- 
=

Fernando Q. Gouveahttp://www.colby.edu/~fqgouvea
Carter Professor of Mathematics
Dept. of Mathematics
Colby College
5836 Mayflower Hill
Waterville, ME 04901

Further Pronunciation Advice

That math whiz Euler (Leonhard)
Had a great mind, but a peon heart.
His life was spare and frugal,
His sex life strictly conjugal.

   -- John Derbyshire

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.



--
William (http://wstein.org)
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.


--
=
Fernando Q. Gouveahttp://www.colby.edu/~fqgouvea
Carter Professor of Mathematics
Dept. of Mathematics
Colby College
5836 Mayflower Hill
Waterville, ME 04901

Flagrant breaches of good breeding, like singing in the streets
or any other gross misconduct, are easily apparent and do not
call especially for admonition and instruction.
  -- Cicero, De Oficiis

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Re: [sage-support] what am I missing?

2023-04-13 Thread William Stein 
Hi,

I think I randomly ran into this same thing with sage-9.8 this week too.
My guess is that there is some sort of overflow bug in the computation of
the y-axis labels.  It's probably one of the most severe bugs in sage ever,
since it is so likely to be randomly misleading...

On Thu, Apr 13, 2023 at 1:15 PM Fernando Gouvea  wrote:

> I must be missing something here...
>
> sage: g(x)=x^10/(1-x)^11
> sage: plot(g(x),(0,0.9))
>
> sage: g(0.7)
> 15945.8104850773
>
> What's wrong?
>
> Fernando
>
> --
> =
> Fernando Q. Gouvea http://www.colby.edu/~fqgouvea
> Carter Professor of Mathematics
> Dept. of Mathematics
> Colby College
> 5836 Mayflower Hill
> Waterville, ME 04901
>
> Further Pronunciation Advice
>
> That math whiz Euler (Leonhard)
> Had a great mind, but a peon heart.
> His life was spare and frugal,
> His sex life strictly conjugal.
>
>   -- John Derbyshire
>
>
> --
> You received this message because you are subscribed to the Google Groups
> "sage-support" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to sage-support+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/sage-support/57352ea7-2214-50af-9944-1eed986c9442%40colby.edu
> 
> .
>


-- 
William (http://wstein.org)

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