Public bug reported:
Imagine trying to model a non-linear system with two critical points
(maybe they are close to eachother, maybe they aren't) where you know
the region of the critical points but you are not sure the behaviour of
those critical points and want to verify your knowledge of said
behaviour. You're going to want to have a couple of isoclines,which you
can already do, but you also might want more than the 196-225 arrows
that, while probably a decent amount of arrows for some purposes, don't
give a very clear idea of which direction for very small regions between
critical points.
This change adds a new value, that you can configure in plot setup, called
number_of_arrows, which is roughly going to correspond to how many arrows are
displayed. If you leave it default, it gives roughly the number of arrows, but
you can crank it way up. That way you can get a better idea of these systems,
like say,
x'=x-y+x^2
y'=x+2*y
where you want to see the swirl of the arrows a in little more detail
to review, to get to this screen, you go
1) load ("plotdf");
2) plotdf(x,[x,-1,1],[y,-1,1]);
(or substitute for the first 'x' your favourite defined function f(x,y), and
for the two ranges, your own chosen range)
3) click on the wrench icon to go into Plot Setup
before the change:
4) nothing, you're SOL there is no setting for number of arrows
after the change:
4) Enter in a chosen number of arrows to display
5) click OK
6) click the refresh icon to generate a new phase diagram/slope field, and
optionally click on said diagram to plot an isocline.
xmaxima:
Installed: 5.37.2-8
Candidate: 5.37.2-8
Version table:
*** 5.37.2-8 500
500 http://archive.ubuntu.com/ubuntu yakkety/universe amd64 Packages
100 /var/lib/dpkg/status
maxima:
Installed: 5.37.2-8
Candidate: 5.37.2-8
Version table:
*** 5.37.2-8 500
500 http://archive.ubuntu.com/ubuntu yakkety/universe amd64 Packages
100 /var/lib/dpkg/status
Ubuntu: 16.10 (yakkety)
ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: xmaxima 5.37.2-8
ProcVersionSignature: Ubuntu 4.8.0-39.42-generic 4.8.17
Uname: Linux 4.8.0-39-generic x86_64
ApportVersion: 2.20.3-0ubuntu8.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Sun Mar 5 15:37:12 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-07-09 (970 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140708)
SourcePackage: maxima
UpgradeStatus: Upgraded to yakkety on 2016-10-16 (140 days ago)
** Affects: maxima (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug yakkety
** Patch added: "adds new field, number_of_arrows which controls plotdf arrow
density"
https://bugs.launchpad.net/bugs/1670196/+attachment/4832000/+files/plotdf2.diff
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https://bugs.launchpad.net/bugs/1670196
Title:
xmaxima plotdf doesn't allow for changing arrow density
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