[Matplotlib-users] two y axes via twinx and legends
Hi, This mailing list is great---I've gotten a couple very useful replies from others in a very short time period. Thanks! And now, onto my next question. I need to construct a two-y-axis plot. I've found some hints on how to do this on the mailing archive (Subject: secondary y-axis, Date: 9/28/05). I've got the basics working, but have run into the same problem this prior post did: I want a legend that lists content from both the left-hand-sided plots and the right-hand-sided ones. It appears only one axis or the others data can appear in a legend. Is there anyway to merge the two axes into a single legend? Also, the mail archives I'm viewing look terrible: line breaks aren't in the usual place, things are presented with 's in them (which would make sense if the line breaks were preserved, b/c they correspond to pieces of prior email content). I'm using Safari 2.0.4 w/Mac OS X 10.4.8. Do others see the same thing, and if the answer is yes, are folks satisfied with this state of affairs? Thanks, --b - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] passing 1D or 2D arrays to contour, pcolor, image, plot
Below is the last (or nearly so) message of a thread from last summer. I have now implemented option 3 in svn, so: If y is 2-D, plot(y) plots the columns of y against the row-index. If x is 1-D and y is 2-D, plot(x,y) plots the columns of y against x. (In this case, x can also be 2-D if it is a single column.) If x is 2-D and y is 1-D, plot(x,y) plots y against each successive column of x. (Again, y can also be a single column.) If x and y are both 2-D, plot(x,y) plots columns of y against the corresponding columns of x. They must have the same number of columns. All of this is consistent with Matlab, as far as I know. Apart from this compatibility aspect, the design tradeoff is between the appeal of plotting rows, on the grounds that they correspond to C storage order, versus the appeal of plotting columns, on the grounds that one tends to think of columns in a table as the natural vectors to be plotted. I don't think it makes much difference in efficiency; transposing is cheap in numpy. It is possible that plotting non-contiguous values triggers an additional array copy somewhere in the chain of operations. I have not tried to figure out whether it does, or what the time penalty would be if it does, but I strongly doubt it would be a noticeable fraction of the total plot generation time. The changes are only very lightly tested so far, so please look for bugs. Eric Mark Bakker wrote: You are right, concerning your comment below. That will work just fine, Mark On 7/13/06, *Eric Firing* [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: But why is this better than the following? plot(Z[0,:], Z[1:,:]) The latter would accomplish the same, be completely consistent with option 4, be completely explicit and unambiguous, require no more typing than using a kwarg, require no extra logic in the plot code, and require no extra documentation for the plot command. Eric As you said, there will be many more opinions, Mark To summarize, the options seem to be: 1) Leave plot argument parsing alone. 2) Accept an Nx2 array in place of a pair of arguments containing x and y. 3) Implement the Matlab model. 4) Implement the Matlab model, but taking rows instead of columns in an X or Y array that is 2-D. I am open to arguments, but my preference is the Matlab model. I don't think that the difference in native array storage order matters much. It is more important to have the API at the plot method and function level match the way people think. Eric - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] more outdated/unhelpful documentation and installation issues on Mac OS X 10.4
Note: there is a type-o in the above email. W/MacPorts, I've been able to get the TkAgg backend to work should be W/MacPython, I've been able to get the TkAgg backend to work - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] two y axes via twinx and legends
Looks like I've been able to help myself on this one. I'll post this here b/c others had asked about this in prior emails and I never saw an answer given. You can make your own custom legend by keeping the return values from each plot command: e.g. l1 = plot(y1's stuff) twinx() l2 = plot(y2's stuff) legend([l1,l2],['y1s tag','y2s tag']) works like a charm. HTH --b - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
