Re: [R] persp Error. x,y,z with the same length 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 > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.