The renderers that you pass on to the `plot` function can be manipulated
outside the call to plot, so you can read the datasets you need, construct
a renderer for each one, group them in a list and pass them on to plot. I
am not familiar with Matlab, but based on your description, you can
implement hold-on and hold-off as follows:
#lang racket
(require plot)
(define the-renderers '())
(define (hold-on renderer)
(set! the-renderers (cons renderer the-renderers)))
(define (hold-off)
(begin0
(plot (reverse the-renderers))
(set! the-renderers '())))
;; add a renderer for SIN
(hold-on (function sin 0 10))
;; add a renderer for COS
(hold-on (function cos 0 10))
;; Show the plot
(hold-off)
Alternatively, if you want a separate plot for each function, you can
implement hold-off as follows:
(define (hold-off-2)
(begin0
(for/list ([renderer (reverse the-renderers)])
(plot renderer))
(set! the-renderers '())))
Alex.
On Thursday, April 9, 2020 at 2:35:04 PM UTC+8, greadey wrote:
>
> Hi All,
>
> Can anyone give me some pointers on plotting multiple data sets on one set
> of axes. Plotting two or more data sets on one set of axes is easy if you
> know in advance what the data is called;
>
> (plot (list
> (lines set1)
> (points set2))
> #:x-label "x" #:y-label "y")
>
> however I have a list of data sets generated from reading a bunch of files
> in a directory and I wish to loop through the list and add each data-set to
> an existing set of axes.
>
> Iterating through the data and plotting each set results in multiple plot
> windows.
>
> In summary I am looking for something similar to Matlab's "hold on" e.g.
>
> ;Pseudo Matlab code
>
> figure()
> for idx = 1 : numel(list-of (list-of vector-pairs))
> plot(list-of (list-of vector-pairs))(idx)
> hold on
> end
> hold off
>
> I have got (plot-new-window? #t), however as far as I know this is just
> causing a plot to appear in a new window rather than directly in the repl.
>
> Many thanks,
>
> greadey.
>
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