use of npoints under contour fails

[GoogleCodeExporter]

What steps will reproduce the problem?
1. define some objective function to minimize: call it chi2
2. give the usual commands:
        m = minuit.Minuit(chi2, a=a_fid, b=b_fid)
        m.migrad()
        cont = array(m.contour("a", "b", 1., 50))

What is the expected output? What do you see instead?

I expected to have as output an array of 50 contour points, at the 1 sigma 
level, instead of the default 20 points... In fact the following error is 
issued:

TypeError                                 Traceback (most recent call last)

/home/orca/Dropbox/supernovae/SN_sim/scripts/<ipython console> in <module>()

/home/orca/Dropbox/supernovae/SN_sim/scripts/trotta_sim_func.py in 
trotta_sim(a_fid, b_fid, x_std, y_std, nobs, xmin, xmax)                        

     48         m.printMode = 1
     49         m.migrad()
---> 50         cont = array(m.contour("a", "b", 1.,50))
     51         cont = append(cont,[[cont[0,0],cont[0,1]]],axis=0)
     52         subplot(1,2,2)

TypeError: Arguments are: param1, param2, number of sigmas, and optionally 
approximate number of points (20).


What version of the product are you using? On what operating system?

This corresponds to the latest pyminuit in its homepage, run under a Debian 
unstable (sid) system.

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 18 Jul 2011 at 8:22