DAMASK_EICMD/processing/post/addSpectralDecomposition.py

61 lines
1.9 KiB
Python
Executable File

#!/usr/bin/env python3
import os
import sys
from io import StringIO
from optparse import OptionParser
import numpy as np
import damask
scriptName = os.path.splitext(os.path.basename(__file__))[0]
scriptID = ' '.join([scriptName,damask.version])
# --------------------------------------------------------------------
# MAIN
# --------------------------------------------------------------------
parser = OptionParser(option_class=damask.extendableOption, usage='%prog options [ASCIItable(s)]', description = """
Add column(s) containing eigenvalues and eigenvectors of requested symmetric tensor column(s).
""", version = scriptID)
parser.add_option('-t','--tensor',
dest = 'tensor',
action = 'extend', metavar = '<string LIST>',
help = 'heading of columns containing tensor field values')
parser.add_option('--no-check',
dest = 'rh',
action = 'store_false',
help = 'skip check for right-handed eigenvector basis')
parser.set_defaults(rh = True,
)
(options,filenames) = parser.parse_args()
if filenames == []: filenames = [None]
for name in filenames:
damask.util.report(scriptName,name)
table = damask.Table.from_ASCII(StringIO(''.join(sys.stdin.read())) if name is None else name)
for tensor in options.tensor:
t = table.get(tensor).reshape(-1,3,3)
(u,v) = np.linalg.eigh(damask.mechanics.symmetric(t))
if options.rh: v[np.linalg.det(v) < 0.0,:,2] *= -1.0
for i,o in enumerate(['Min','Mid','Max']):
table.add('eigval{}({})'.format(o,tensor),u[:,i],
scriptID+' '+' '.join(sys.argv[1:]))
for i,o in enumerate(['Min','Mid','Max']):
table.add('eigvec{}({})'.format(o,tensor),v[:,:,i],
scriptID+' '+' '.join(sys.argv[1:]))
table.to_ASCII(sys.stdout if name is None else name)