A small function that captures the currently visible data in a matlab line plot and exports to a data file instantly readable with pgfplots in latex. It is based on and needs the reduce_to_width function by Tucker McClure available here:
https://github.com/tuckermcclure/matlab-plot-big/blob/master/reduce_to_width.m
Its automatically reduces the number of samples to the minimum to reproduce the displayed matlab graph in the pgf axes. Works also with zoomed data. Note that the reduction results depend on the figure width and height.