Re: [Gnuplot-info] Waterfall / Cascade Plot

[Thor A. <ta...@to...>]

On Fri, Apr 12, 2013 at 08:56:12AM -0700, howudodat wrote:
> Also, I have posted one of the source data files at
> http://www.earthbest.com/wf.csv.zip

According to 'help plot matrix' your data format is in an in-between
state, i.e. it is uniform but includes frequency in the first column. So
in order to plot it, you need to do a little pre-processing.

To convert the data to a uniform format the first column should be
removed, this can be done by a program called 'cut':

-- >8 --
set datafile separator comma
set view map
splot '< cut -d, -f2- wf.csv' matrix with image
-- >8 --

I've used 'map' and 'with image' because these use less memory.

It's bit more involved, but you can also convert the data to the
non-uniform format by adding the y-values as the first row, the sequence
can be generated by 'seq':

-- >8 --
set datafile separator comma
set view map
splot '< seq -s, 602; cat wf.csv' nonuniform matrix with image 
-- >8 --

-- 
best regards
Thor Andreassen