I do the folloowing in order to get 3D Plot:

y<-1:(point/2)
x<-20:30
z<-r[1:(point/2)]
persp(x,y,z,theta = 135, phi = 30, col = "green3", scale = FALSE,
ltheta = -120, shade = 0.75,
      border = 1)


y:

[1] 1 2 3 4 5

x:

[1] 20 21 22 23 24 25

z:

[1] 4811.000000    3.593025    6.968666    4.908174    5.332700

but i always get the error message Error in persp.default(x, y, z, theta =
135, phi = 30, col = "green3", :invalid 'z' argument

How may I solve the issue?

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