Ejemplo n.º 1
0
def test_bbfit():
    temperatures = [5,10,15,20,25]
    betas        = [1,1.25,1.5,1.75,2.0,2.25,2.5]
    columns      = [22,23,24]
    wavelengths = [#np.array([70,160,250,350,500,850,1100],dtype='float'),
        np.array([160,250,350,500,1100],dtype='float'),
        np.array([160,250,350,500],dtype='float')]
    errlevels = [0.1,0.2,0.05]

    temperature = 20.*u.K
    beta = 1.75
    column = 1e22*u.cm**-2
    wavelength = wavelengths[0]*u.um
    errlevel = errlevels[0]

    #for temperature,beta,column in itertools.product(temperatures,betas,columns):

    tguess=20
    bguess=1.5
    nguess=21
    tguess=temperature
    bguess=beta
    nguess=column

    flux = modified_blackbody(wavelength.to(u.Hz,u.spectral()), temperature,
                              beta=beta)
    err = errlevel*flux.unit

    p = PixelFitter()

    mp = p(wavelength, flux, err)
Ejemplo n.º 2
0
def test_fit_cube():
    """
    Performance test of cube fitting
    """

    for nt,nb in zip([5,50],[5,50]):

        wavelengths = ([70,160,250,350,500] * u.um).to(u.GHz, u.spectral())
        #parameters = np.array([(tem,beta)
        #                       for tem in np.linspace(15,100,nt)*u.K
        #                       for beta in np.linspace(1,2,nb)]).reshape(2,nt,nb).T
        imagecube = np.array([modified_blackbody(wavelengths, tem, beta=beta)
                              for tem in np.linspace(15,100,nt)*u.K
                              for beta in np.linspace(1,2,nb)]).reshape([wavelengths.size,nt,nb])*u.erg/u.s/u.cm**2/u.Hz

        import time
        tt = time.time()
        result = fit_modified_blackbody_to_imagecube(imagecube.to(u.MJy).value, fits.Header(), ncores=1)
        stime = (time.time()-tt)

        tt = time.time()
        result = fit_modified_blackbody_to_imagecube(imagecube.to(u.MJy).value, fits.Header(), ncores=4)
        ptime = (time.time()-tt)

        print
        print 'nt,nb = %i,%i parallel map in %g secs' % (nt,nb,ptime)
        print 'nt,nb = %i,%i serial map in %g secs' % (nt,nb,stime)