Peter Melchior wrote: > Hello, > > I understand that hold() creates a axes if there is none. > What I want to do is plotting a couple of plots in each of the subplots. > > The data I want to display is stored in a set of files, thus I have a > loop of plot calls in each subplot: > > hold(True) > subplot(311) > for i in range(8): > bins = somefunction(i) > data = someotherfunction(i) > plot(bins,data) > subplot(312) > for i in range(8): > ... > > That's why I want to ensure that hold is set to True. > Is there a better way of achieving that?
One way is this: ax = subplot(311) ax.hold(True) Or this: subplot(311) hold(True) The plot command will not change the hold state unless you tell it to by giving it a hold kwarg, in which case it will only temporarily change it--the change will not affect the next plot command. Another way is to set the default via the rcParams array, as in many of the example scripts that come with the source distribution, or via the matplotlibrc file. In both cases, it is the axes.hold parameter. The default is True, so unless you have a non-default matplotlibrc file, you should be getting the behavior you want without having to do anything at all. Still, setting it explicitly in your script is a good idea because it makes it clear what is going on, and it makes the script immune to changes in the matplotlibrc file. Eric > > Best regards, > > Peter Melchior > > > > Eric Firing wrote: >> The pylab hold command sets the hold variable for the current axes. >> If there is none, it makes one, hence the full-size axes on which your >> subplots are superimposed. The hold variable determines whether >> subsequent calls to something like "plot" erase the axes first, or >> superimpose their drawing on whatever was already there. >> >> What is it you are really trying to do? >> >> Eric >> >> Peter Melchior wrote: >>> Hello everybody, >>> >>> when using this very simple script, I get three subplots which lie on >>> top of a >>> empty plot covering the whole area of the figure: >>> >>> from numpy import * >>> from pylab import * >>> >>> hold(True) >>> subplot(311) >>> subplot(312) >>> subplot(313) >>> show() >>> >>> The result of this code can be viewed here: >>> https://www.ita.uni-heidelberg.de/~pmelchior/subplot_overlay.png >>> >>> If I leave out the line "hold(True)", which could also read >>> "hold(False)", the >>> underlying plot disappears. >>> >>> Is there a way to avoid that? Or: Is there a preferred position for >>> the "hold" >>> command? >>> >>> Best regards, >>> >>> Peter Melchior ------------------------------------------------------------------------- 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.php&p=sourceforge&CID=DEVDEV _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
