Red Hat Bugzilla – Bug 844100
transmission lines are broken with --enable-newpred
Last modified: 2017-03-30 05:45:08 EDT
Created attachment 600949 [details]
A simple netlist demonstrating the problem.
Description of problem:
Transmission lines show no output on far terminal.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. ngspice case.cir
197 1.785000e-08 0.000000e+00 0.000000e+00
198 1.795000e-08 0.000000e+00 0.000000e+00
199 1.805000e-08 0.000000e+00 0.000000e+00
200 1.815000e-08 0.000000e+00 0.000000e+00
201 1.825000e-08 0.000000e+00 0.000000e+00
202 1.835000e-08 0.000000e+00 0.000000e+00
203 1.845000e-08 0.000000e+00 0.000000e+00
204 1.855000e-08 0.000000e+00 0.000000e+00
205 1.865000e-08 0.000000e+00 0.000000e+00
206 1.875000e-08 0.000000e+00 0.000000e+00
207 1.885000e-08 0.000000e+00 0.000000e+00
208 1.895000e-08 0.000000e+00 0.000000e+00
209 1.905000e-08 0.000000e+00 0.000000e+00
210 1.915000e-08 0.000000e+00 0.000000e+00
211 1.925000e-08 0.000000e+00 0.000000e+00
212 1.935000e-08 0.000000e+00 0.000000e+00
213 1.945000e-08 0.000000e+00 0.000000e+00
214 1.955000e-08 0.000000e+00 0.000000e+00
215 1.965000e-08 0.000000e+00 0.000000e+00
216 1.975000e-08 0.000000e+00 0.000000e+00
217 1.985000e-08 0.000000e+00 0.000000e+00
218 1.995000e-08 0.000000e+00 0.000000e+00
219 2.000000e-08 0.000000e+00 0.000000e+00
197 1.785000e-08 0.000000e+00 4.495961e-04
198 1.795000e-08 0.000000e+00 4.495961e-04
199 1.805000e-08 0.000000e+00 4.271163e-04
200 1.815000e-08 0.000000e+00 3.821567e-04
201 1.825000e-08 0.000000e+00 3.371971e-04
202 1.835000e-08 0.000000e+00 2.922374e-04
203 1.845000e-08 0.000000e+00 2.472778e-04
204 1.855000e-08 0.000000e+00 2.023182e-04
205 1.865000e-08 0.000000e+00 1.573586e-04
206 1.875000e-08 0.000000e+00 1.123990e-04
207 1.885000e-08 0.000000e+00 6.743941e-05
208 1.895000e-08 -1.75010e-19 2.247980e-05
209 1.905000e-08 -1.32234e-06 2.417332e-18
210 1.915000e-08 -3.96702e-06 -5.29953e-18
211 1.925000e-08 -6.61171e-06 -8.36743e-31
212 1.935000e-08 -9.25639e-06 2.691729e-31
213 1.945000e-08 -1.19011e-05 -3.78513e-44
214 1.955000e-08 -1.45458e-05 2.946809e-58
215 1.965000e-08 -1.71904e-05 0.000000e+00
216 1.975000e-08 -1.98351e-05 0.000000e+00
217 1.985000e-08 -2.24798e-05 0.000000e+00
218 1.995000e-08 -2.51245e-05 0.000000e+00
219 2.000000e-08 -2.59509e-05 0.000000e+00
Removing "--enable-newpred" from the configure lines allows ngspice to properly handle tranmission lines.
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After looking at actually what --enable-newpred does (in source code), it seems to be doing nothing but something harmful, so I decided to disable this now.
*** This bug has been marked as a duplicate of bug 1429130 ***