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def LeapFrog(x) : xn = x[0] vn = x[1] dt = 0.01 k = 3 xnn = xn + vn * dt vnn = vn - k * dt * xnn return [xnn, vnn] x0 = [2,3] x = [x0] for i in range( 79 ): x0 = LeapFrog( x0 ) x += [x0] print(x)
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x[:][0] x[][0] x[,0]
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[xin[0] for xin in x ]
![[PukiWiki]](image/ROBO192.png "[PukiWiki]")
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