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A note from yesterday's presentation #5

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hamogu merged 1 commit into from
May 2, 2013
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A note from yesterday's presentation #5

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11 changes: 11 additions & 0 deletions source/fitting/spectrum.rst
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Expand Up @@ -35,6 +35,17 @@ Loading the data
staterror = None
syserror = None

.. Note::
The ``load_data`` command may not work in the stand-alone version of
Sherpa. If not, you can use ``pyfits`` to load in the data and then
``load_arrays``, for example::

import pyfits
dat = pyfits.open('3c273.fits')[1].data
wlen = dat.field('WAVELENGTH')
flux = dat.field('FLUX')
ui.load_arrays(1, wlen, flux)

As the file contains two columns, they are taken to be the ``x`` and
``y`` data values. The y values are small (of order 10^-14): ::

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