cvar#

SpecialPurpose.cvar(ir='', ia='', ib='', itype='', datum='', name='', **kwargs)#

Computes covariance between two quantities.

Mechanical APDL Command: CVAR

Parameters:
irstr

Arbitrary reference number assigned to the resulting variable (2 to NV ( numvar )). If this number is the same as for a previous variable, the previous variable will be overwritten with this result.

iastr

Reference numbers of the two variables to be operated on. If only one, leave IB blank.

ibstr

Reference numbers of the two variables to be operated on. If only one, leave IB blank.

itypeint or str

Defines the type of response PSD to be calculated:

  • 0,1 - Displacement (default).

  • 2 - Velocity.

  • 3 - Acceleration.

datumint or str

Defines the reference with respect to which covariance is to be calculated:

  • 1 - Absolute value.

  • 2 - Relative to base (default).

namestr

Thirty-two character name for identifying the variable on listings and displays. Embedded blanks are compressed upon output.

Notes

This command computes the covariance value for the variables referenced by the reference numbers IA and IB. If DATUM = 2, the variable referenced by IR will contain the individual modal contributions (that is, the dynamic or relative values). If DATUM = 1, the variable referenced by IR will contain the modal contributions followed by the contributions of pseudo- static and covariance between dynamic and pseudo-static responses. File.PSD must be available for the calculations to occur.