题目

mathematica软件,已知y[x],Y=f1(x),X(x)=f2(x),如何plot Y[X]?
y[x_] := x + 9.81/2*x*x
k=1
X[x] = x - k*y'[x]/(1 + (y'[x])^2)^0.5
Y[x] = y[x] + k/(1 + (y'[x])^2)^0.5
Plot[{y[x],Y[X],},{x,0,2}]

提问时间：2021-03-26

答案

参数方程曲线绘制用ParametricPlot函数.y[x_] := x + 9.81/2*x*x;k = 1;X[x_] := x - k*y'[x]/(1 + (y'[x])^2)^0.5;Y[x_] := y[x] + k/(1 + (y'[x])^2)^0.5;ParametricPlot[{X[x], Y[x]}, {x, 0, 2}, AspectRatio->1...