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Author Topic: The Post Your Thoughts of the Moment Thread 2  (Read 3204222 times)

blah54

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2970 on: March 16, 2009, 02:46:58 PM »

greek is right, sin(2pi) is 0... just think about a standard sine curve, it hits the x axis twice in one full period (well technically three in one period), at 0, pi and 2pi, and since the sine curve continues the same way, at 4pi, it would also equal zero...

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GreekGeek

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2971 on: March 16, 2009, 03:36:11 PM »

If you draw a circle with parametric:
x = cos(T)
y = sin(T)
You'll get a circle movement. If you divide the circle into 4 equal pieces and name the point (1,0) 0, you go round a quarter of a circle against the clock (I mean not-clockwise ::))(which makes 0,5pi), the sin is max, which equals 1. And when you add another quarter, you get at the point of 1pi, where sin is min, which equals 0. So every time you get
0 + k x pi, the sin equals 0, the cos equals 1, and everytime you get 0,5 + k x pi, the sin equals 1 and the cos equals 0. The way blah54 does it, might even be better, but that's personal.

Man, don't we all love math ::)

Jamaha

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2972 on: March 16, 2009, 04:36:22 PM »

I'm well aware that sin is 0 for all values of npi, where n is an integer.

What interests me is why does the calculator give an answer, which is really close to zero, but not quite, for most values of sin(npi). However, there are certain values which do return zero.

In fact, when running the program through 0 ..... 10000, only the following numbers of n return zero:
Code: [Select]
0 1 2 3 5 10 15 20 25 30 50 100 150 200 250 300 500 1000 1500 2000 2500 3000 5000 10000
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random_goldfish

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2973 on: March 16, 2009, 05:42:50 PM »

Math! Run away! Ahhhhhhhh!
I really, really, really hate math. I'd probably be good at it if my head didn't explode everytime I think about it.
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Brassman388

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2974 on: March 16, 2009, 05:43:12 PM »

Hey Jamaha, how the uploader script coming along?
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Jamaha

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2975 on: March 16, 2009, 06:49:07 PM »

Shit.

I went to check the uploader files. Open the script and....the hell? Why is this the first revision with no purpose whatsoever? Where is all the work I put into it?

Searched for upload.php's in my computer, only found that one file. Then it hit me.

About a month ago, when my computer became a bitch and I switched OSes, I backuped everything necessary. Or so I thought. I copied over the NSM directory, containing all NSM's files. But now for the best part...guess who forgot that he copied the files over to another directory for testing purposes and continued editing the code there. Now did I remember to copy the testing directory as well, did I?

Long story short, all that's left of the uploader is like 10 lines of code a blind monkey could write with its hands cut off. Uploader status: 0%.

God damn this.
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Brassman388

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2976 on: March 16, 2009, 07:16:29 PM »

It's all good, as long as we plan to make progress again. right?

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Jamaha

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2977 on: March 16, 2009, 07:18:35 PM »

Yes, I'll recreate it once my exams end.

But still...damn.
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GreekGeek

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2978 on: March 16, 2009, 08:23:06 PM »

I'm well aware that sin is 0 for all values of npi, where n is an integer.

What interests me is why does the calculator give an answer, which is really close to zero, but not quite, for most values of sin(npi). However, there are certain values which do return zero.

In fact, when running the program through 0 ..... 10000, only the following numbers of n return zero:
Code: [Select]
0 1 2 3 5 10 15 20 25 30 50 100 150 200 250 300 500 1000 1500 2000 2500 3000 5000 10000
That's really too hard, I'm sorry. I'm not that good at math.

ALPRAS

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2979 on: March 16, 2009, 08:58:24 PM »

I dont have maths xD
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Brassman388

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2980 on: March 16, 2009, 10:07:34 PM »

I dont have maths xD

Me niether. XD
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ALPRAS

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2981 on: March 16, 2009, 11:25:04 PM »

Its another thing that I like in music: we dont need the maths class xD
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KefkaticFanatic

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2982 on: March 17, 2009, 03:15:22 AM »

You haven't delt much with music then, study it more and you'll realise that much of it IS math.
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Brassman388

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2983 on: March 17, 2009, 03:54:22 AM »

Don't say that or he'll give up music too. XD
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GreekGeek

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Re: The Post Your Thoughts of the Moment Thread 2.
« Reply #2984 on: March 17, 2009, 07:31:28 AM »

Of course he won't, music is an addiction. But music is all math. Went to a masterclass, which was about the math of music. Very interesting, but SOO difficult. The base of it: easy (x(t) = A cos(2 π f t + φ)), but then it gets so complicated. And if you understand the math, your possibilities of editing music are really increased. I'm surprised how you can not have math :o You are still in high school aren't you? Here it's obligatory to have math as a subject for your final. Complete rubbish (since I hate math too), but it's quite awkward to emigrate temporarily ;D
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