tick marks on mfrow=c(3,3) plot

I am generating an array of similar plots using the par(mfrow=c(3,3))
method.  Everything works fine except the plot only puts y-axis tick marks
on cells in column one and x-axis tick marks on cells in row three.  I
would like tick marks on both the x and y axix of all 9 plots in my array.

I am generating plots using the following two functions

three.by.three.plot <- function(ss)
{
par(mfrow=c(3,3))
sub.plot(ss,1.5,0.02)
sub.plot(ss,1.5,0.04)
etc
par(mfrow=c(1,1))
}

sub.plot <- function(ss,gamma, prv)
{
plot(c(5,20,50),ss[ss[,"gam"]==gamma & ss[,"prev"]==prv,"x_Power"],
      type = "n", xlab="4Nc", ylab="Power",xlim=c(0,55), ylim=c(0,1),las=1)
lines(c(5,20,50),ss[ss[,"gam"]==gamma & ss[,"prev"]==prv,"x_Power"],
      type ="b",lty=2, pch=15,mkh=0.11)
....plus some other lines commands....
}


Any suggestions???
Thanks in advance.  Tony

I hacked your functions a bit to get them to work with artificial 
data, and had no problems.

my code:

three.by.three.plot <- function(ss)
  {
    par(mfrow=c(3,3))
    sub.plot(ss,-1,-1)
    sub.plot(ss,-1,0)
    sub.plot(ss,-1,1)
    sub.plot(ss,0,-1)
    sub.plot(ss,0,0)
    sub.plot(ss,0,1)
    sub.plot(ss,1,-1)
    sub.plot(ss,1,0)
    sub.plot(ss,1,1)
  }

sub.plot <- function(ss,gamma,prv)
  {
    plot(ss[ss[,"y"]==gamma & ss[,"z"]==prv,"x"],
         ss[ss[,"y"]==gamma & ss[,"z"]==prv,"plot.values"],
         type="n", xlab="4Nc", ylab="Power", las=1)
    lines(ss[ss[,"y"]==gamma & ss[,"z"]==prv,"x"],
          ss[ss[,"y"]==gamma & ss[,"z"]==prv,"plot.values"],
          type="b",lty=2,pch=15,mkh=0.11)
  }
z<-rnorm(400)
z[z < -1]<- -1
z[z > 1 ] <- 1
z[ z!= -1 & z != 1 ] <- 0
y<-rnorm(400)
y[y < -1]<- -1
y[y > 1 ] <- 1
y[ y!= -1 & y != 1 ] <- 0
x<- (1:400)/400
plot.values<- cos(x)
xyz <- cbind(x,y,z,plot.values)
three.by.three.plot(xyz)

tick marks all show up.  I'm using R 1.0.0 on Win98.  

James Marca
jmarca at translab.its.uci.edu
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