# [R] i need help about reverse axes

Ali Alsamawi ali.alsamawi at unsw.edu.au
Fri Jun 4 02:48:02 CEST 2010

```Hello

im trying to plot 3d  with scatterplot packages , everything is work on my program below  but my problenm i want to set my pressure level or axis(z-axis) to reverse like from bottom to top, i used function "rev" but not work just for 2d plots the figure in attachment and the program shows below, can anyone help me to do this

Thanks
Ali

library()
library(scatterplot3d)

## open binary file to read
dat <- file("/srv/scratch/z3303149/back_Traj/parcel1_1",open="rb")
skip1st1 = seek(dat,where=4)
dim(alldata) <- c(10,504)

totlen= 504
## replace zeros in lon,lat,pres,wv_cont with missing
for (i in 1:totlen) {
if (alldata[2,i]==0) alldata[2,i] = NA
if (alldata[3,i]==0) alldata[3,i] = NA
if (alldata[4,i]==0) alldata[4,i] = NA
if (alldata[10,i]==0) alldata[10,i] = NA
}

## total number of non-missing values
len = totlen - sum(is.na(alldata[2,]))

## set the dataset to use for colouring
coldat = alldata[10,1:len]

## creat colour from wv_cont - in hsv
hcol = cumsum(coldat)

hcol = hcol/max(hcol,na.rm=TRUE)
print(hcol)
col <- hsv(h=hcol,s=1,v=1)

X <- scatterplot3d(alldata[2,1:len],alldata[3,1:len],alldata[4,1:len],
xlab="lon",ylab="lat",zlab="pres",main="The Trajectory of the parcel1_1 (%)",zlim=rev(range(alldata[4,1:len])))

#to show the first point of the trajectory
X\$points3d(alldata[2,1],alldata[3,1],alldata[4,1],col =col, type = "p", pch = 15)

X\$points3d(alldata[2,1:len],alldata[3,1:len],alldata[4,1:len],col =col, type = "p", pch = 1)

## create labelbar - need to create an image in order to do so
lbcol = hsv(h=seq(0,1,0.01),s=1,v=1)
tmp1=c(1:len)
tmp3=matrix(coldat,len,1)

par(oma=c( 0,0,0,0),font.axis=1,mar=(c(14.1,4.1,4.1,1.1)),cex=0.8)
,legend.shrink=0.8,legend.width=1)

#png()

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