pyyeti.cb.uset_convert

pyyeti.cb.uset_convert(uset, ref=None, conv='m2e')

Convert units of a “uset” DataFrame.

Parameters:

• uset (pandas DataFrame) – A DataFrame as output by pyyeti.nastran.op2.OP2.rdn2cop2().

• ref (3-element array_like or None; optional) – If 3-element array_like, the length units are converted for ref as well as for uset. If None (or anything else), it is ignored.

• conv (2-element array_like or string; optional) –

  If 2-element array_like, it is:

  (length_conversion, mass_conversion)
  

  If string, it is one of:

  • ‘m2e’ (convert from metric to English)

  • ‘e2m’ (convert from English to metric)

  The string form assumes units of meter & kg, and inch & lbf*s**2/inch (slinch).

Returns:

• uset_converted (pandas DataFrame) – The converted uset DataFrame

• ref_converted (3-element 1d ndarray or None) – The converted version of ref or, if ref was not a 3-element array_like, it is ref itself

Examples

Convert a USET table from inches to meters.

>>> import numpy as np
>>> from pyyeti import cb
>>> from pyyeti.nastran import n2p
>>> # node 100 in basic is @ [50, 100, 150] inches
>>> uset = n2p.addgrid(None, 100, 'b', 0, [50, 100, 150], 0)
>>> uset
          nasset     x      y      z
id  dof...
100 1    2097154  50.0  100.0  150.0
    2    2097154   0.0    1.0    0.0
    3    2097154   0.0    0.0    0.0
    4    2097154   1.0    0.0    0.0
    5    2097154   0.0    1.0    0.0
    6    2097154   0.0    0.0    1.0
>>> uset_conv, ref_conv = cb.uset_convert(
...     uset, (100, 100, 100), "e2m")
>>> uset_conv
          nasset     x     y     z
id  dof...
100 1    2097154  1.27  2.54  3.81
    2    2097154  0.00  1.00  0.00
    3    2097154  0.00  0.00  0.00
    4    2097154  1.00  0.00  0.00
    5    2097154  0.00  1.00  0.00
    6    2097154  0.00  0.00  1.00
>>> ref_conv
array([ 2.54,  2.54,  2.54])