Hi
I've just begun using ngspice and found that I cannot plot the current output. Also, I cannot specify the name of a circuit component in a .PRINT or .PLOT statement. Only the node numbers seem to work. Here is an example:
Ohm' Law
Vin 1 0 5
R1 0 1 10K
.DC Vin 1 5 1
.PRINT DC V(R1)
.END
Vin 1 0 5
R1 0 1 10K
.DC Vin 1 5 1
.PRINT DC V(R1)
.END
ngspice doesn't seem to recognize R1 in the .PRINT statement. I get the following error:
Circuit: ohm's law
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
Warning: can't parse 'r1': ignored
Error: no data saved for D.C. Transfer curve analysis; analysis not run
doAnalyses: not found
run simulation(s) aborted
Error: .print: no dc analysis found.
elapsed time since last call: 0.011 seconds.
Total elapsed time: 0.011 seconds.
Total DRAM available = 2008.300781 MB.
DRAM currently available = 423.984375 MB.
Total ngspice program size = 18.778320 MB.
Resident set size = 732.000 kB.
Shared ngspice pages = 551.000 kB.
Text (code) pages = 1.958008 MB.
Stack = 0 bytes.
Library pages = 5.961914 MB.
-------------------------------------------------------------------------------------------------
The simulation however works if I replace it with
.PRINT DC V(0,1)
Secondly, I can't seem to print current. Using
.PRINT DC I(R1) or .PRINT DC I(0,1) gives me this error:
Circuit: ohm's law
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
Warning: can't parse '0#branch': ignored
Error: no data saved for D.C. Transfer curve analysis; analysis not run
doAnalyses: not found
run simulation(s) aborted
Error: .print: no dc analysis found.
elapsed time since last call: 0.013 seconds.
Total elapsed time: 0.013 seconds.
Total DRAM available = 2008.300781 MB.
DRAM currently available = 423.871094 MB.
Total ngspice program size = 18.778320 MB.
Resident set size = 733.000 kB.
Shared ngspice pages = 551.000 kB.
Text (code) pages = 1.958008 MB.
Stack = 0 bytes.
Library pages = 5.961914 MB.
--------------------------------------------------------------------------------------------
I don't see this happening in gnucap however (in this case V(0,1) will not work). Am I doing something wrong or is ngspice meant to work this way? I went according to the ngspice manual. I'm using Fedora 13 64-bit with Free Electronic Lab groupinstalled.
Thanks! :-)
Ashwith J. Rego
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