Re: [Ngspice-users] Are pointers to data structures in the SendData callback function constant?

[Holger V. <hol...@un...>]

I have had a look at the source code. The following is added to the manual:

When a new simulation (op, dc, ac, tran etc.) is started, a new 'plot' 
structure (see [sec:Plots]) with its vectors is set up. Several data 
structures, as described above, are set up as well, belonging to this 
'plot': pvecinfo with vecinfo for each vector, vecinfoall, vecvaluesall, 
pvecvalues, and vecvalues for each vector. Their pointers are kept 
constant during the current simulation, they are created anew when 
another simulation is executed.

You might find this code in sharedspice.c, lines 2241 ff., in function 
sh_vecinit().