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].
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.