[R] What is the easiest way to interpolate vertical values on a square section of a nearly-planar 3D surface

I want to map out a mostly flat area of land, 300 meters on a side.  I want to make (x,y,z) triples where x and y vary between -150 and 150 and there is just one z value. Eventually I will try to use graphics to actually draw this, but my first problem is that I need to get 90601 values by i

[R] can par()$pin be used to guarantee equal horizontal and vertical image lengths?

Today at 10:03 AM I use several different versions of R, including RGui on Windows and rstudio on Linux.  In all cases, I use graphical commands, such as image().  image() displays rectangles, but I want to be able to guarantee that the heights of those rectangles will always equal the w

[R] equal horizontal and vertical proportions in graphics

I use several different versions of R, including RGui on Windows and rstudio on Linux.  In all cases, I use graphical commands, such as image().  image() displays rectangles, but I want to be able to guarantee that the heights of those rectangles will always equal the widths.  Typically, the r