Create alpha-carbon distance maps

distance_maps.py

def calc_dist_matrix(residues):
    """Returns a matrix of distances between residues of the same chain."""
    size = len(residues)
    answer = np.zeros((size, size), np.float)
    for row, residue_one in enumerate(residues):
        for col, residue_two in enumerate(residues):
            answer[row, col] = residue_one["CA"] - residue_two["CA"]
    return answer