[20分]點解d sine,cos wave 有angle o既?

用戶26729

2007-10-11 4:56 pm

睇下依個網:

http://www.udel.edu/idsardi/sinewave/sinewave.html

o個度有個phase box(入面只可以打0至360度)
例如我打10度,個wave 就向左邊移動左少少,我打個度數越大佢就移得越多, 但係我唔明向左移, 同圓形o既度數有咩關係呀(個wave我睇唔出邊度有角度可以睇到)

唔該晒.

回答 (1)

ric

2007-10-11 5:09 pm

✔ 最佳答案

The number you enter in the phase box is the angle that you want to show "from"...

for example, sin 0 = 0, sin 90 = 1, sin 180= -1....
so, when you type in 0, the wave starts at Y=0..
and when you put in 90, the wave starts at y=1( assume your amplitude = 100%)
when you put in 180, the wave would starts at y = -1..

one more thing, it reason why it only takes 0-360, is that all these sin, cos wave are cycles, ie, sin 360 = sin 0 = 0.
therefore, if you want to see what it looks like for sin 540, then you have to calculate the corresponding angle, ie 540 - 360 = 180, then you can get the wave of sin 540 by put in looking at sin 180, cause they are the same.

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