Fixing vertical and horizontal axes in R

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.

https://stat.ethz.ch/R-manual/R-devel/library/MASS/html/eqscplot.html

Hope that helps,

  Shane Baylis

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