Re: [R] persp() problem

[David Winsemius]

On Nov 19, 2011, at 3:19 PM, John Benning wrote:

Hi, and thanks in advance for any assistance,


any help would be greatly appreciated. Below is the printout from the
console.

Many thanks,

john
--------------------------------------------------------

*> x*
*[1]  0  5 10 15 20*
*
*
*> y*
*[1]  0  5 10 15 20*
*
*
*> z*
*     [,1]  [,2]   [,3]   [,4]   [,5]  *
*[1,] 4.538 9.169  23.518 32.794 39.322*
*[2,] 5.013 13.104 33.282 42.202 45.474*
*[3,] 5.296 17.728 36.989 43.89  46.57 *
*[4,] 5.366 20.94  39.244 44.987 47.177*
*[5,] 5.642 23.396 40.842 45.489 47.126*
*
*
*> persp(x,y,z)*
*Error in persp.default(x, y, z) : invalid 'z' argument*

I'm new to R and to this mailing list, and am having trouble with the * persp()* function. I've got a matrix (z) of values for various combinations of x and y, each of which is a set of (0, 5, 10, 15, 20). But when I try * persp(x,y,z)*, I get an "*invalid z argument*" error, and when I try simply *persp(z)*, R returns an "*invalid x argument*" error, along with warning messages. It seems like a very simple problem, so excuse my ignorance, but

Unable to reproduce. Maybe z is not a 5 x 5 matrix?

> x <-scan()
1:  0  5 10 15 20
6:
Read 5 items
>  y <-scan()
1:   0  5 10 15 20
6:
Read 5 items
>  z <-matrix(scan(),5,5);
1:  4.538 9.169  23.518 32.794 39.322
6:  5.013 13.104 33.282 42.202 45.474
11:  5.296 17.728 36.989 43.89  46.57
16:  5.366 20.94  39.244 44.987 47.177
21:  5.642 23.396 40.842 45.489 47.126
26:
Read 25 items
> persp(x,y,z)

Attached.

Rplot.pdf
Description: Adobe PDF document

David Winsemius, MD
West Hartford, CT


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