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From: wugi <wugi@brol.invalid>
Newsgroups: sci.math
Subject: Re: why doesn't wolfram alpha plot this graph?
Date: Mon, 18 Nov 2024 19:09:24 -0300
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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.

-- 
guido wugi