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Editorial Team
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Asked: 2026-06-18T11:05:14+00:00

This thread explains how to create a matrix from x/y/z coordinates using the akima

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This thread explains how to create a matrix from x/y/z coordinates using the akima package but I’d rather not use a new package. After all, you can do the same thing in one command in gnuplot: gnuplot interpolation.

The image plot using a matrix of data points in the above gnuplot thread can be achieved in R with a call to the image() command.

What about a surface plot, how can we interpolate the x/y/z points to generate a 2d heatmap?

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1 Answer

  1. Editorial Team

    Well, if you don’t like akima::interp, maybe stats::loess is to your taste?

    topo.loess <- loess (z ~ x * y, topo, degree = 2, span = 0.2)
x <- seq (min (topo$x), max (topo$x), .05)
y <- seq (min (topo$y), max (topo$y), .05)
interpolated <- predict (topo.loess, expand.grid (x = x, y = y))
image (x= x, y= y, z = interpolated, asp = 1)
points (topo)

    (also along the lines of MASS)

    smoothed interpolation

    Otherwise: why not use gnuplot? Though it may be considered a different piece of software as well…

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