Downsamples a sample list using LTTB.

Arguments

• sample_list: a List of samples. These can have any representation provided that access functions are provided (see Options). The samples are assumed to be sorted by the x coordinate.
• threshold: the number of required output samples. Must be >= 0.
• opts: a keyword list of options.

Options

• sample_to_x_fun: a function that takes as argument a sample and returns its x coordinate. Defaults to sample[:x]
• sample_to_y_fun: a function that takes as argument a sample and returns its y coordinate. Defaults to sample[:y]
• xy_to_sample_fun: a function that takes as argument x and y and returns a sample with these coordinates. Defaults to %{x: x, y: y}

Return

• sample_list: a downsampled list of samples.