Jason Stone, on 2011-02-18 14:39, wrote: > Good afternoon all, > One last matplotlib question for the group for today. On one of my GUI > plots, I'm calling imshow on an array of data (to display it in the same way > MATLAB's imagesc command does). I'd like to add a second y-axis to the > right side of the plot that is completely dependent on the values on the > primary y-axis. Essentially, for each y-axis tick point, I'll put the > y-axis 'value' into a formula and then put the result on the second y-axis. > I did this in MATLAB by essentially overlaying a second set of axes over > the plot, but I haven't found the exact way to do it with matplotlib yet. > I've seen a few examples online, but they all use the second overlaid plot > to actually plot new data - I wouldn't be doing this. > Would I need to use the twinx (or twiny) function? > Are there examples of this on the web that I haven't found that somebody > could point me towards?
Hi Jason, here's an example that does what you want, using e^x as the formula, change the paramter to fmtr to suit your needs: ax = plt.subplot(1,1,1) ax.plot(np.sin(np.linspace(0,np.pi))) ax2 = ax.twinx() ax2._sharey = ax # share both x and y fmtr = mpl.ticker.FuncFormatter(lambda x,pos: "%.2f"%np.exp(x)) ax2.yaxis.set_major_formatter(fmtr) plt.draw() best, -- Paul Ivanov 314 address only used for lists, off-list direct email at: http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7
signature.asc
Description: Digital signature
------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev
_______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
