Hi All, I'm trying to simulate a basic two transistor schematic using the gf180 pdk which seems to work fine, however, when I try and

write myrawfile.raw all

I get this message displayed and it doesn't write anything to the file at all

Warning from checkvalid: vector @m.xm1.m0[ib] is not available or has zero length.

I don't even care about

ib

but i can't seem to write the file with the vectors i do care about either. when i type display at the ngspice prompt i get this

Here are the vectors currently active:

Title: * gmoverid
Name: dc1 (DC transfer characteristic)
Date: Sat Dec 24 20:52:08  2022

    @m.xm1.m0[ib]       : current, real, 0 long
    @m.xm1.m0[id]       : current, real, 331 long
    @m.xm1.m0[ig]       : current, real, 0 long
    @m.xm1.m0[is]       : current, real, 0 long
    @m.xm2.m0[ib]       : current, real, 0 long
    @m.xm2.m0[id]       : current, real, 331 long
    @m.xm2.m0[ig]       : current, real, 0 long
    @m.xm2.m0[is]       : current, real, 0 long
    v-sweep             : voltage, real, 331 long [default scale]

Any help would be much appreciated. Happy Christmas! PS: this is for

** ngspice-38+ : Circuit level simulation program

@Tom, this is a known issue with ngspice. If no body current is present no vector is generated for ib and write command complains. add a

remzerovec

command before write.

Ah great. Thank you @Stefan Schippers, I will do that. Merry Christmas!