Hi Marshall,

You might want to have a look at https://github.com/aphyr/gnuplot

>From the repo: "Datasets are streamed as sequences directly to gnuplot's 
stdin, so there's no temporary files to worry about. Yep, lazy sequences 
are streamed lazily. My laptop can plot about 10 million points in about a 
minute, and most of the CPU time is spent inside gnuplot in that test, so 
I'm reasonably happy."


Op maandag 17 oktober 2016 07:54:41 UTC+2 schreef Mars0i:
> Looks very nice! Thanks Jean Niklas.  I've been using Incanter for charts, 
> which has been fine so far for my needs, but clj-xchart looks like it will 
> make it easier to make nicer charts, and it would avoid loading much of 
> Incanter when you don't need some of the other things Incanter provides.  
> (I also use nvd3 to generate charts in a browser with Clojurescript.)
> Since you've developed a charting library, maybe I'll mention a feature 
> that I have wanted (I think!): 
> I've been making plots with a large number of points--100K, sometimes even 
> 1M or 2M per data sequence.  Sometimes I will sample a larger sequence 
> every 10 or 100 steps to reduce the burden on the Incanter or nvd3 plotting 
> function, but sometimes I want to see what the data looks like with all of 
> the points.
> I generate the data in a lazy sequence, using iterate, where, let's say, 
> each element of the sequence is a map containing several pieces  of y 
> values for the x value corresponding to that element of the sequence, e.g.
> data = ({:a y-a-1, :b y-b-1, :c y-c-1}, {:a y-a-2, :b y-b-2, :c y-c-2}, 
> ...)
> In order to plot all three sequences of y values in Incanter or nvd3 (and 
> clj-xchart?), I have to extract a new sequence of values for each data 
> series, e.g. like this:
> (map :a data)
> (map :b data)
> (map :c data)
> and I have to generate several sequences of x values by calling (range) 
> repeatedly.  I pass these six lazy sequences to the chart function, but at 
> least in Incanter and nvd3, I don't believe Incanter does anything until it 
> realizes all of the sequences.  That means that it realizes six distinct 
> sequences, I think, and my initial sequence of maps will have been realized 
> as well.  
> But if I'm plotting several sequences of y values that are embedded in a 
> sequence of maps or vectors, each with several y values for the same x, I 
> wonder if it could be more to efficient pass the entire complex sequence to 
> the plotting function at once, and only provide one set of x values if all 
> of the y values will share the same x's.  If the plotting function extracts 
> the y values as it reads through the sequence of maps/vectors, and needs 
> only one sequence of x's, then only two sequences are realized.
> Maybe this is an unusual need, at present, but as Clojure is used for more 
> scientific applications, it might become more common.

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