如何使用3D绘图在枫树中绘制函数（偏导数）

Question

我有以下功能

u := proc (x, t) options operator, arrow; 
    50+sum((100*n*Pi*sin(n*Pi)+100*cos(n*Pi)-100)*cos((1/10)*n*Pi*x)*exp(-(1/100)*n^2*Pi^2*t)/(n^2*Pi^2), n = 1 .. 20) 
    end proc;

plot3d(u(x, t), x = 0 .. 10, t = 0 .. 20)

我试图在Maple中绘制它，但是没有给我正确的3D形状。

Answer 1

plot3d(diff(u(x, t),x), x = 0 .. 10, t = 0 .. 20);

private static int oneRun(int range) {
    int[] rInt = new int[range + 1];
    return IntStream
        .rangeClosed(0, range)
        .peek(i -> rInt[i] = generator.nextInt(range))
        .filter(i -> IntStream.range(0, i).anyMatch(j -> rInt[i] == rInt[j]))
        .findFirst()
        .orElseThrow(() -> new RuntimeException("Shouldn't be reached!"));
}