I think it is.
But the data needs to be changed slightly.
(I have been mostly ignoring plot and pd myself, and I just now went
through the plot lab.)
An important thing to understand seems to be that
H=:|:|.V=:j./~i:2j8
'pensize 2;color 50 255 255' plot H,V
is at least roughly equivalent to:
pd 'reset'
pd 'pensize 2;color 50 255 255'
pd H,V
pd show
In other words, you can just call pd twice, once with the left argument for
plot and once with the right argument. But since pd is breaks things out
into steps, you also need to start with a pd 'reset' and then do a pd
'show' at the end.
Basically, pd can tell whether you have given character data (options) or
numeric data (which needs to be plotted). In fact, hypothetically speaking,
plot could maybe be rewritten as:
plot=:3 :0
'' plot y
:
pd 'reset'
pd x
pd y
pd 'show'
)
That's not how it works though (and I wonder what issues the current
implementation of plot addresses which I am currently unaware of - but
that's not important right now).
Anyways, once you have the grid plotted, you can add another plot to the
display by doing another sequence of pd instructions for the parabola, but
without the 'reset'.
P=: 2<.*:i:2j32
pd 'pensize 2;color BLUE'
pd P
pd 'show'
Note that since we did not do a 'reset' here, we get to keep what we have
already displayed.
The problem is that the implied X axis for the parabola (0 to 32) is not
the same size as the grid (_2 to 2). So it looks "wrong".
To fix this, we need to explicitly specify the values for the X axis of the
parabola:
pd 'reset'
pd 'pensize 2;color 50 255 255'
pd H,V
pd 'pensize 2;color BLUE'
pd (i:2j32);P
pd 'show'
Finally, note that, if you prefer,
require 'numeric'
steps _2 2 32
could have been used instead of i:2j32.
(I am avoiding the use of the definition of 'do' for generating the X
values, because J already supplies a definition for 'do' which does
something different.)
Thanks,
--
Raul
On Fri, Apr 25, 2014 at 1:43 AM, Alex Giannakopoulos <
[email protected]> wrote:
> Otherwise (having just looked in the Labs) I think the "pd" verb may allow
> you to plot different size data on the same plot. I haven't used it yet,
> I'll check it out now, but it may be what you need.
>
>
> On 25 April 2014 06:36, Alex Giannakopoulos <[email protected]>
> wrote:
>
> > ... contd
> >
> > Using (]+0j1*P) or similar
> >
> > Also I think the intervals must be the same on one plot. If you try to
> > mix an 8-interval with a 32-interval matrix, the 8-matrix will get padded
> > with 0s or 0j0s, rendering a nice spider's web in the latter case. You
> > will need to pad the 8-matrix with the values of the terminal points to
> > avoid this.
> >
> >
> > On 25 April 2014 06:15, alexgian <[email protected]> wrote:
> >
> >> Further, you seem to have specified your grid in the Argand plane, I
> >> don't think you can mix and match with reals just like that (I may be
> wrong
> >> - certainly no expert on J plotting).
> >> So you'd have to translate your parabola to complex coords if you wanted
> >> to display it in the same context, I think.
> >>
> >>
> >> On 25 April 2014 06:00, alexgian <[email protected]> wrote:
> >>
> >>> Not quite sure what you're trying to do, but would this be a step in
> the
> >>> right direction?
> >>>
> >>>
> >>> load 'plot'
> >>>
> >>> do=: 13 :'({.y) +(i.>:{:y)*(--/ 2{.y)%{:y'
> >>>
> >>> G=:do _2 2 32
> >>>
> >>> P=: 2 <. *:
> >>>
> >>> plot (];P) G
> >>>
> >>>
> >>> In your version you have not specified x-coordinates, so it picks 0-32.
> >>>
> >>> By using ] you specify the x-range
> >>>
> >>>
> >>> Also note that that you do not need "do", there is a plot builtin
> called
> >>> "steps":
> >>>
> >>> plot (];P) steps _2 2 32
> >>>
> >>> would achieve the same result
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> On 25 April 2014 01:25, Linda Alvord <[email protected]> wrote:
> >>>
> >>>> Can anyone help me put the parabola, P, on the graph paper without
> >>>> changing
> >>>> the scales of the graph paper.
> >>>>
> >>>> load 'plot'
> >>>> do=: 13 :'({.y) +(i.>:{:y)*(--/ 2{.y)%{:y'
> >>>> A=:do _2 2 8
> >>>> V=:j./~ A
> >>>> H=:|:|. V
> >>>> 'pensize 2;color 50 255 255' plot H,V
> >>>>
> >>>> f=:*:
> >>>> 'pensize 2;color BLUE' plot P=: 2 <. f do _2 2 32
> >>>>
> >>>> Linda
> >>>> ----------------------------------------------------------------------
> >>>> For information about J forums see
> http://www.jsoftware.com/forums.htm
> >>>>
> >>>
> >>>
> >>
> >
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
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