8.5.2 How else can I export a NRM to a file?

Numerator relationship matrices may be exported to a text file in ``ijk format'', where each line is of the form ``animal_A animal_B rAB'' using the pyp_io.save_ijk() function. Diagonal entries are

, where

is the animal's coefficient of inbreedin.

example = pyp_newclasses.loadPedigree(options)
# Save the NRM to a file in ijk format.
# Don't forget to set the filename.
pyp_io.save_ijk(example,'nrm_ijk.txt')

Suppose that the example above produces the following file:

$ head nrm_ijk.txt
4627 4627 1.125
4627 0832 0.0
4627 5538 0.5
...

In order to get

for animal 4627 you need to find the corresponding diagonal element and subtract 1 from it:

$\displaystyle f_a = 1.125 - 1.0 = 0.125$

The coefficient of relationship between 4627 and 5538 is

(4627 is probably a parent of 5538). Note that the file nrm_ijk.txt will include only the diagonal and upper off-diagonal elements of the NRM, and should have

lines.

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