QDVAL
QDVAL, TBLNO1, TBLNO2, SV1, SV2, SV3, SV4, SV5, SV6, SV7
Defines PSD quadspectral values.
TBLNO1First input PSD table number associated with this spectrum.
TBLNO2Second input PSD table number associated with this spectrum.
SV1,SV2,SV3, . . . ,SV7PSD quadspectral values corresponding to the frequency points (PSDFRQ).
Notes
Defines PSD quadspectral values to be associated with the previously defined frequency points. Repeat QDVAL command with the same table number for additional points. Unlike autospectra (PSDVAL), the quadspectra can be positive or negative. The quadspectral curve segment where there is a sign change is interpolated linearly (the rest of the curve segments use log-log interpolation). For better accuracy, choose as small a curve segment as possible wherever a sign change occurs.
Two table numbers are required since values are off-diagonal terms. This command is valid for SPOPT,PSD only.
This command is also valid in PREP7.