Hi Margaret,
eqscplot() can handle this scenario. Can you try:
fn <- "SpeciesRateLevels11F.jpg"
jpeg(fn, width = 600, height = 700)
zmeshR <- matrix(zmeshR,ng,ng)
eqscplot(x = x, y = y, type = "n", xlab = "Easting", ylab = "Northing",
main = "Estimated number of native species / .01 ha")
image(xgrid,ygrid,zmeshR,bty="l",
col=zz.colors,
add = TRUE)
points(x,y,col="red",cex=0.7)
lines(Jboundary[,1],Jboundary[,2],col="black",lwd=2)
b <- contourLines(xgrid,ygrid ,
zmeshR, nlevels=11,
levels = c(2, 4, 6, 8,10,12,14,16,18,20,22))
for (i in 1:11){
lines(b[[i]], col="black", lwd=1)
}
In this case the limits of the plot will be set in terms of x and/or y,
rather than xgrid and ygrid. If you need to include more of the
background that was generated in your original image() call, you can use
dummy x and y variables in the eqscplot() call, so that the whole
image() area falls between their minimum and maximum.
Cheers,
Shane
On 12/05/16 15:55, Margaret Donald wrote:
Thanks, Shane, but that is precisely my problem. The final graph will
not be the default windows size and I want to
a) nominate the overall height & width, and
b) enforce the equal scales on the x and y axes.
My code currently looks like this:
# Generate image plot 2:
#-----------------------
fn <- "SpeciesRateLevels11F.jpg"
jpeg(fn, width=600, height=700)
zmeshR <- matrix(zmeshR,ng,ng)
image(xgrid,ygrid,zmeshR,bty="l",xlab="Easting",ylab="Northing",
col=zz.colors, xlim=c(xx1, xx2), ylim=c(yy1, yy2),
main="Estimated number of native species /.01 ha")
points(x,y,col="red",cex=0.7)
lines(Jboundary[,1],Jboundary[,2],col="black",lwd=2)
b <- contourLines(xgrid,ygrid ,
zmeshR, nlevels=11,
levels = c(2, 4, 6, 8,10,12,14,16,18,20,22))
for (i in 1:11){
lines(b[[i]], col="black", lwd=1)
}
Cheers,
Margaret Donald
On 12 May 2016 at 14:02, Shane Baylis <shane.m.baylis at gmail.com
<mailto:shane.m.baylis at gmail.com>> wrote:
Hi Margaret,
It sounds like you're after eqscplot(), in package MASS. The
overall size can be set as for any plot window, but note that if
you scale the plot by dragging the limits of the plot window (or
similar), the plot will need to be re-generated after scaling the
window to ensure that equal-scale is maintained.
Hope that helps,
Shane Baylis
On 12/05/16 13:13, Margaret Donald wrote:
I have a figure which uses the same measurement units both
vertically and
horizontally. I need the interval representing 20 m to be
identical for
both the x and y axes. How do I specify this? And at the same
time dictate
the size of the overall graph which is being saved as a jpeg.
Regards,
Margaret Donald