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From: sobriquet <dohduhdah@yahoo.com>
Newsgroups: sci.math
Subject: Re: why doesn't wolfram alpha plot this graph?
Date: Tue, 19 Nov 2024 01:49:34 +0100
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Op 18/11/2024 om 23:09 schreef wugi:
> Op 18/11/2024 om 19:01 schreef wugi:
>> Op 18/11/2024 om 12:28 schreef wugi:
>>> Op 18/11/2024 om 10:22 schreef sobriquet:
>>>> Op 18/11/2024 om 01:16 schreef wugi:
>>>>> Op 16/11/2024 om 16:25 schreef sobriquet:
>>>>>> Op 16/11/2024 om 20:22 schreef sobriquet:
>>>>>>> Hi!
>>>>>>>
>>>>>>> Recently someone shared this on discord:
>>>>>>>
>>>>>>> https://www.desmos.com/calculator/rddekjhbtu
>>>>>>>
>>>>>>> Somehow wolfram alpha seems unable to plot this?
>>>>>>>
>>>>>>> https://www.wolframalpha.com/input?i=plot+y%3Dsin%282x%29%2F2+tan%28%282pi%29%5E%7Csin%28x%29%2Biy%7C%29
>>>>>>>
>>>>>>
>>>>>> Uh... that wolfram link should actually be this one instead:
>>>>>>
>>>>>> https://www.wolframalpha.com/input?i=plot+y%3Dsin%282x%29%2F2+tan%28%282pi%29%5E%281-%7Csin%28x%29%2Biy%7C%29%29
>>>>>
>>>>> It's in the tan( ) part. Desmos plots a train of circles surmounted 
>>>>> by a flattened sine. Wolfram refuses that one. Multifunction?
>>>>>
>>>>
>>>> Mod can cause issues I guess..
>>>> I can reduce the expression and still wolfram won't plot it, while 
>>>> desmos does.
>>>>
>>>> https://www.desmos.com/calculator/ryppmmdhsi
>>>>
>>>> https://www.wolframalpha.com/input?i=plot+y%3Dx%7Cx%2Biy%7C
>>>
>>> It seems it can plot graphs with
>>> y=Abs(f(x)) but not with
>>> y=Abs(f(x,y)).
>>> But it does with
>>> Re() and Im()
>>>
>> ... while sqrt(xx-yy) isn't a problem:
>> https://www.wolframalpha.com/input?i=plot+y%3Dx*sqrt%28xx-yy%29
>>
>> !!??
> 
> [rather (...+yy)]
> 
> And this one:
> https://www.wolframalpha.com/input?i=plot+y%3Dsin%282x%29%2F2+tan%28%282pi%29%5E%281-sqrt%28%28sin%28x%29%29%5E2%2By%5E2%29
> 
> Complex mods or abss won't do.
> 

Ah great.. that makes sense.

Yeah.. the +yy vs -yy had me confused a bit..

https://www.desmos.com/3d/es3qju0qem