[R] persp Error. x,y,z with the same length
Duncan Murdoch
murdoch at stats.uwo.ca
Wed Apr 11 18:01:19 CEST 2007
Felix Wave wrote:
> Hello,
> I have a problem in drawing a 3d graphic. I simplified the program to show you the problem.
>
> I have a text file with hundreds of entries in 3 columns. I scaned these columns with matrix(scan). Then, I transformed some datas. Now I have the datas in h,x,y.
> I created a new matrix to use persp . But I got an error. The reason is probably the same length of x,y,z.
>
> But what can I do the draw my datas in a 3d graphic? (I want to use persp resp. image)
>
persp is for drawing a surface, not a 3d scatterplot. If the points are
somehow distributed on a surface, you
need to convert them to the format persp expects: z in a rectangular
matrix of values, x and y giving row and column values. The interp()
function in the akima package can do this.
If you want a 3d scatterplot, you can use the plot3d function in rgl, or
scatterplot3d in the package of the same name.
Duncan Murdoch
> Thanks a lot!
> Felix
>
>
> the code:
> ------------
> h <- Measure3[,4]
> x <- Measure3[,3]
> y <- Measure3[,2]
>
> z <- matrix(c(x,y,h),ncol=3)
> z
>
> persp(x, y, z)
>
>
>
>> z
>>
> [,1] [,2] [,3]
> [1,] 0.0 0 0.000000000
> [2,] 0.1 0 0.000538990
> [3,] 0.2 0 0.002315760
> [4,] 0.3 0 0.005333315
> [5,] 0.4 0 0.009595005
> [6,] 0.5 0 0.015104450
> [7,] 0.6 0 0.021865495
> [8,] 0.7 0 0.029882130
> [9,] 0.8 0 0.039158475
> [10,] 0.9 0 0.049698760
>
> Default in persp.default(x, y, z) : increasing 'x' and 'y' values expected
>
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