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Geek Culture / Rotating a plotted graph

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Rudolpho
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Posted: 22nd Jan 2007 11:53
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Just a quick question here; does anybody know how to alter a function so that it's graph is turned 90 degrees?

Thanks for replies, guys.

"I kören hörs de brummande busarna Björnligan och Gondolen"
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Kentaree
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Posted: 22nd Jan 2007 13:09
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Invert the x and y axis?

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Rudolpho
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Posted: 22nd Jan 2007 13:47
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Well.... firstly, that would turn it 180 degrees I think.
Secondly, it isn't a regular f(x) = ? function, but written like this:


It's purpose is to generate a cardiod graph, which could then be used as a heart symbol in a game.
(Yep, I know that I can just get it as an image and rotate that, but I'd like to create this with just drawing functions)

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Lost in Thought
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Posted: 22nd Jan 2007 13:50 Edited at: 22nd Jan 2007 13:55
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He didn't mean invert them really. He meant use the x values for the y and the y for the x



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Kentaree
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Posted: 22nd Jan 2007 17:03
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Yea, the right word would've been "swap" probably

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Rudolpho
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Posted: 22nd Jan 2007 19:02
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Ah, I see.
Thanks

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Gil Galvanti
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Posted: 23rd Jan 2007 05:56 Edited at: 23rd Jan 2007 05:56
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It's called an "inverse" . When you switch x and y and/or mirror over the line y=x

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Chily Dog
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Posted: 23rd Jan 2007 07:19
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Would this be for calculus, as in moving a conic section around the graph?
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El Goorf
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Posted: 23rd Jan 2007 10:34
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at first i thought he meant volumes of a rotation

this works by squaring the function, integrating, and then multiplying by pi

after that, divide by a quarter to get 90 degrees, ie 90/360.
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Xander
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Posted: 26th Jan 2007 20:13
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Or you could convert the function to a polor function, add 90 degrees (0.5*pi) to theta, and then convert it back to an x/y function

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El Goorf
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Posted: 27th Jan 2007 12:50 Edited at: 27th Jan 2007 12:52
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correction... multiply by a quater*

to rotate a graph by 90 degrees in the other sense, you just multiply the gradient by 1/-1
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