I think you can clip the data, using >. and <. or using # with an appropriate selection.
Thanks, -- Raul On Fri, Apr 25, 2014 at 2:41 AM, Alex Giannakopoulos < [email protected]> wrote: > And yes, a way to set the vertical limits, without resorting to background > "grids" would be good. > Surely it must be hidden there somewhere? > > > On 25 April 2014 07:34, Alex Giannakopoulos <[email protected]> > wrote: > > > Clarification: > > Hm, actually it showed automatically the first time, but then needed a pd > > 'show' for subsequent reruns, unless the plot window was closed. > > > > > > On 25 April 2014 07:20, Alex Giannakopoulos <[email protected] > >wrote: > > > >> Yup, interesting. > >> I would add, though, that in the simple example I gave above, I did not > >> have to use, pd 'show', it seemed to do so automatically. > >> Implementation change? > >> > >> > >> On 25 April 2014 07:12, Raul Miller <[email protected]> wrote: > >> > >>> 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 > >>> > > >>> ---------------------------------------------------------------------- > >>> For information about J forums see http://www.jsoftware.com/forums.htm > >>> > >> > >> > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
