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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1670196 Title: xmaxima plotdf doesn't allow for changing arrow density To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/maxima/+bug/1670196/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs