I think what you are asking for is interpolation. You have a set of (x,y) data, and you want to find a new y-value corresponding to a given x-value.
Take a look at scipy.interpolate.interp1d import numpy import scipy import scipy.interpolate # Set up fake "data". x= numpy.arange(10) y = numpy.sin(x) # Set up an interpolate object. interp_func = scipy.interpolate.interp1d(x, y) # Find the intepolated value of y, given x=3.5. ynew = interp_func(3.5) print ynew Hope that helps, Roban On Fri, Aug 8, 2008 at 2:14 PM, Kazansky, Stella (SKAZANSK) <[EMAIL PROTECTED]> wrote: > > Hello, everyone, > I am creating a plot based on several (x,y) value pairs (it constitutes some > fuel burn envelope). > > Then I have to draw a line parallel to X axis with a given value of X that > would start at my plot, which means I have to find a value of Y on my plot > > that corresponds to a given X. Or an intersection of my plot and the line > parallel to X axis. > > I couldn't find a way to do it. > If somebody can help I' really appreciate it. > > Thanks > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great > prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
