r - 预期增加 'x' 和 'y' 值

Question

我想用这段代码做一个非常简单的 3D 绘图:

x<-c(1:10)
y<-c(10:1)
z<-cbind(x,y)

persp(x,y,z, theta = 30, phi = 30, expand = 0.5, col = "lightblue")

但我收到此错误:

Error in persp.default(x, y, z, theta = 30, phi = 30,  : 
  increasing 'x' and 'y' values expected

我应该怎么做才能解决这个问题？

更新
如果我改变我的数据。例如对于 x

test<-c(0.4118836, 0.3481329, 0.3582897, 0.3122690, 0.3346040, 0.2409363, 0.2474494, 0.1744042, 0.1589965, 0.2435564)

进而

x<-test
y<-c(1:10)
z<-matrix(x,nrow=length(x),ncol=length(y))
persp(x,y,z, theta = 30, phi = 30, expand = 0.5, col = "lightblue")

我收到同样的错误

Answer 1

两个x和 y正如错误消息所说，应该增加。试试 y <- 1:10 .

此外，z也可能有问题。我们读到 ?persp :

Notice that persp interprets the z matrix as a table of f(x[i], y[j]) values, so that the x axis corresponds to row number and the y axis to column number, with column 1 at the bottom, so that with the standard rotation angles, the top left corner of the matrix is displayed at the left hand side, closest to the user.

创建z 的简单方法是通过调用 outer .

尝试例如

x <- 1:10
y <- 1:10
z <- outer(x, y, function(xi, yj) xi^2+yj^2)
persp(x, y, z)