Use the example files in tpl6\dynamics, prestiff103.dat and prestiff103pl.dat as our guides we can see the impact of pressure on a structure. Let's say I want to run a study varying the PLOAD value to see the impact on the modes. I could run STATSUB many times but by extracting the differential stiffness matrix I could simply scale it and proceed directly to solve the eigensolution. I created an ALTER to get KDAA and proved that scaling it matches a change to PLOAD. I also see that the OUG data block has ACODEs for Differential Stiffness. Is there a clean way to extract KDGG or KDAA without an ALTER? It seems to me that if OUG has those ACODE entries, there should be a "standard" request for it. I did try a few MALTER statements to accomplish the same thing, but received the error that KDAA didn't exist. Basically I'm looking for a simple way to get KDGG and/or KDAA into a op2, DMIGPCH or H5 file.
