# No subject

Troels Ring tring at mail1.stofanet.dk
Fri Mar 3 22:31:12 CET 2000

```Dear friends. A very humble admirer of the progress of R with a very simple problem. I have the data shown below

month  day   year  dosis  vanco
12 31 1999 1 3.8
1 3 2000 1 2.4
1 7 2000 1 3.4
1 12 2000 2 7.1
1 14 2000 2 5.3
1 17 2000 2 5.7
1 19 2000 3 7.7
1 21 2000 3 8.3
1 24 2000 4 8.7
1 26 2000 4 11.1
1 31 2000 4 12.3
2 7 2000 4.5 12.0
2 14 2000 4.5 14.9
2 18 2000 4.5 23.0
2 25 2000 3 20.1
2 28 2000 2 11.3

dates <- mdy.date(month,day,year)
persp(dosis,dates,vanco)
-- trying to produce a three demensional picture of vancomycin versus dose and data.
but: Error in persp(dosis, dates, vanco) : increasing x and y values expected
Dates is increaing, and I couldnot figure out how to make both dosis and dates increase and wonder
how to produce a surface in this situation.

Best regards

Troels Ring, M.D
Department of Nephrology
Aalborg, Denmark
tring at mail1.stofanet.dk

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