are you doing a damped modal analysis? If you have a complex solution then the results file will have 2 sets of results for each natural freuqency - the real part and imaginary part. You can use the SET command to look at either one. So for example you can use the below to get the UX value at node 5 for real part of mode 1 and imaginary part of mode 1. Once you have the real and imaginary values you can calculate phase angle or amplitude.
/post1
set,1,1 ! load real part of mode 1 solution
real5=ux(5)
set,1,1,,1 ! load imaginary part of solution
imag5=ux(5)
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