sorry for my delay in responding. I am working on virtuoso 6.1.3, in ADE XL environment. And i am using wavescan.
when i take the signal in calculator it looks like
getdata("M1/m1:ids" ?result "dc-dc"). When i try to plot the signal
from calculator i get the following message in icfb window
expression evalution failed: expression evalutes to nil
"getData(\"/M1/m1:ids\" ?result \"dc-dc\")"nil
Moreover i save operating points in DC sweep using save M0.m1:all