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Index › Suggestions & Bugs › Website,  Documentation,  Book Bugs › Book error / typo, of sorts / sine wave graph
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Book error / typo, of sorts / sine wave graph (Read 987 times)
jelani
Book error / typo, of sorts / sine wave graph
Jun 9th, 2008, 6:10pm  
hi,

i did a search but did not see anything on this. Didn't fill a bug report b/c its not really a bug w/ code, but anyhow

p. 118

I think the graph of the sine wave is wrong

e.g. sine 90 degrees = 1, or in processing println(sin(HALF_PI)); returns 1, but on graph p. 118, 90 / half pi is shown as -1, and therefore the 270 degrees is also in wrong position.

The language in the short section underneath also seems to match the incorrect values on the graph, talking about increasing/decreasing amplitude but in the wrong place for a sine wave.

not a huge deal but for someone like me who is not strong in math it was pretty confusing when reading the book and seeing the values returned from sin() and cos() for the first time.

thanks
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Manic
Re: Book error / typo, of sorts / sine wave graph
Reply #1 - Jun 9th, 2008, 10:08pm  
yup, just looked at my copy of the book, looks like a cosine wave to me.
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fry
Re: Book error / typo, of sorts / sine wave graph
Reply #2 - Jun 9th, 2008, 10:21pm  
http://dev.processing.org/bugs/show_bug.cgi?id=708
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