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Re: plot hyperbola (OT)


This is good to know--unfortunately I'd like to keep the little yellow 
smileys. So I'll probably continue to use my work-around, which is 
Control-U (View Source), and then copying.

          --Urijah Kaplan



Murray Eisenberg wrote:
> I received a solution to this annoyance at long last from the Mozilla 
> forum (where I had posted months ago and never had a response):  In 
> Thunderbird, in Options > Display, uncheck "When displaying plain text 
> messages: Display emoticons as graphics".
> 
> So somebody on the Mozilla team seems to think ^2 is an emoticon!
> 
> Murray Eisenberg wrote:
> 
>>This is a bit off-topic, but it's been an annoyance for a while now....
>>
>>I've been having difficulty copying code such as that below from my
>>e-mail client into Mathematica: The e-mail client, Thunderbird, displays
>>expressions such as "x^2" in a 2-dimensional form, with a superscript
>>(and no caret); when I copy from there and paste into Mathematica, of
>>course I get just "x2" -- no superscript and no caret.
>>
>>I do have my e-mail client set so as not to display HTML as such.
>>
>>Any ideas?
>>
>>David Park wrote:
>>
>>
>>>You could use the ImplicitPlot routine. First you have to load the
>>>Graphics`ImplicitPlot` package that is in the StandardPackages.
>>>
>>>Needs["Graphics`ImplicitPlot`"]
>>>
>>>ImplicitPlot[
>>> x^2 + 3 x^2 y^3 + 67 x^4 y^2 + 34 == 0, {x, -50, 50}, {y, -30000, 0},
>>> AspectRatio -> 1]
>>>
>>>That is a difficult curve and I had to 'fish' around to find it. I also
>>>changed the AspectRatio of the plot to 1 to avoid getting very high and very
>>>narrow plots that went off screen. There may be other branches of the curve.
>>>
>>>You can plot quadratic equations the same way and they will be easier.
>>>
>>>For quadratic equations you may want to look at the ConicSections package at
>>>my web site below. It will generate a parametrization for any conic section
>>>which you can use to plot with ParametricPlot. It also will give the type of
>>>conic, its parameters and how to transform it to standard form.
>>>
>>>David Park
>>>djmp at earthlink.net
>>>http://home.earthlink.net/~djmp/
>>>
>>>
>>>From: bd satish [mailto:bdsatish at gmail.com]
To: mathgroup at smc.vnet.net
>>>
>>> HI, i am a beginner. Will u please tell me how to plot
>>>hyperbola,parabola,ellipse and circle in their standard forms
>>>  x^2/a^2 + y^2/b^2 = 1
>>> x^2/a^2 -- y^2/b^2 ==1 etc.
>>>Also how do you plot a general curve (y versus x), say
>>>   x^2 +3 x^2 y^3 +67 x^4 y^2 +34==0
>>>*without solving explicitly for y* ( or x)
>>> Please help
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
> 


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