Wow, Eric. That's a lot of stuff! Thanks for looking into this to me. It would probably be useful to have a warning message or something if there are 0 values for the log axes. What do you think?
On Jan 8, 2009, at 11:03 PM, Eric Firing wrote: > Simson Garfinkel wrote: >> Thanks, Eric. Any idea for a work-around on the bar graphs? > > There appear to be three problems, each with a workaround or solution: > > 1) You need to set the log scale *before* calling bar. The bar > method checks for log scaling, and if found, it sets the bottom of > the bars to a positive value (1e-100) instead of to zero. If you > set the log scale *after* calling bar, the zero bottom value gets > masked out as invalid. > > 2) The unit support for datetime objects doesn't quite know what to > do with the bar width parameter; it tries to convert it, and I > haven't tried to track down exactly what it ends up with. What I > have found is that if you use a value of width=20 as a kwarg in bar, > you will get close enough that you can make more adjustments to > taste. This is an ugly hack. > > 3) The datetime objects want full years, e.g. 1990, not just the > last two digits. I haven't tried to figure out why, but the x- > limits don't get calculated sensibly if you use 90 instead of 1990. > It presumably has to do with the ticker that is invoked for > datetime. So I think you need to either make your own modification > of the ticker (or formatter), or use all 4 year digits. > > >> As far as the Mac goes, I'm happy to get you a log-in on one, if >> you want. > > Thanks, but I really don't want to try to delve into the brand-new > mac native backend. > > Eric >> -Simson >> On Jan 8, 2009, at 2:31 PM, Eric Firing wrote: >>> Simson Garfinkel wrote: >>>> Hi! >>>> Below is a sample program. It demonstrates two bugs when plotting >>>> date/ time histograms. >>>> 1. When the y scale is made "log", the histogram points plot as >>>> lines, but when the y scale is not log, they histogram plots as >>>> bars. I do not think that the look of the bars should change >>>> depending on whether or not the Y scale is logarithmic. >>> >>> Simson, >>> >>> I verified the strange behavior with log and/or date, but looking >>> at the code did not yield any understanding of what the problems >>> are. I hope someone who has worked on the bar code recently will >>> sort this one out. Definitely, there is at least one major bug >>> that needs to be fixed. >>> >>>> 2. When the "agg.pdf" is removed, specifying "log" for the >>>> yscale produces a TypeError on the mac (see below) >>> >>> This is mac-specific, and I don't have a mac, so I can't help with >>> this, either. > ------------------------------------------------------------------------------ Check out the new SourceForge.net Marketplace. It is the best place to buy or sell services for just about anything Open Source. http://p.sf.net/sfu/Xq1LFB _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
