# README

go-decim

Decimate xy data using Sampler type.

     // xyer implements the plot.XYer interface from gonum/plot.
    xyer := newXYer()
    s := NewSampler(xyer, 1)
    // Accumulate downsampled values.
    var xs, ys []float64
    var x, y float64
    // Ends on io.EOF receive or if NaN/inf value encountered
    for ; err == nil; x, y, err = s.Next() {
    	xs = append(xs, x)
    	ys = append(ys, y)
    }

Comparison with go-lttb shows this algorithm (Rolling X) is considerably slower.

BenchmarkLTTB-8       	   21183	     52009 ns/op	   16384 B/op	       1 allocs/op
BenchmarkRollingX-8   	    4556	    263429 ns/op	     120 B/op	       2 allocs/op

Decimate - CSV processing

Need to graph a curve obtained through a simulation and the amount of points makes pgfplots run out of memory? Or do you simply want to reduce the size of your vector graphics?

Decimate will reduce the amount of points on your curve drastically while maintaining visual fidelity.

Decimate is run from command line

run decimate -h for help

Example

Lots of data points Above is graphed data from a 134MB file (8.4 million data entries). Following image is downsampled data using decimate (0.1 tolerance). Resulting files have a collective size of less than a megabyte.