Question about Atlas example with the santance 'pcm = transpose(pcom_atlas(q));' in spatial_momentum.m ?

[LGF5]

Hello, there is a error when I run the Matlab script ...\frost-dev\example\atlas\spatial_momentum.m,
At line 'pcm = transpose(pcom_atlas(q));', there is no pre-define function of 'pcom_atlas()' at the projecct frost-dev, and I don't know what the purpse of this santance.
Can you help me to solve this problem?