摘要：
x=np.arange(1,100) y = np.sin(0.1*x) def D_1(x,y): n = len(x) d = np.zeros(n) d[0] = (y[1]-y[0])/(x[1]-x[0]) d[n-1] = (y[n-1]-y[n-2])/(x[n-1]-x[n-2]) 阅读全文
摘要：
x = [1,2,3] y1 = np.array([4,5,6]) y2 = np.array([5,6,7]) y3 = np.array([7,6,5]) width = 0.2 Sum = y1+y2+y3 per = 100*y2/Sum #添加在中间，旋转90度 def add_mid( 阅读全文