Plot正弦波（度）

Question

We're supposed to plot the sine wave with the help of Matplotlib but in degrees.

First we're supposed to get every sin(x) from 0-360 degrees, every ten degrees.

I'm a beginner, would really appreciate the help.

def getsin():
    for i in range(0,361,10):
        y=math.sin(math.radians(i))
        sinvalue.append(round(y,3)
sinvalue=[]
getsin()


x=np.linspace(0,360,37)
plot.plot(x,sinvalue)
plot.xlabel("x, degrees")
plot.ylabel("sin(x)")
plot.show()

Answer 1

Your code is almost OK (you missed a closing parenthesis on line sinvalue.append(round(y,3) ), but it can be perfected.

Eg, it's usually considered bad practice updating a global variable (I mean sinvalue ) from inside a function... I don't say that it should never be done, I say that it should be avoided as far as possible.

A more common pattern is to have the function to return a value...

def getsin():
    sines = []
    for i in range(0,361,10):
        y=math.sin(math.radians(i))
        sines.append(round(y,3))
    return sines

Why I say this is better? Compare

sinvalue=[]
getsin()

with

sinvalue = getsin()

At least in my opinion, the second version is waaay better because it makes clear what is happening, now sinvalue is clearly the result of getting the sines...