Cannot solve linear system

[massimo ceraolo]

The model I enclose creates a C code that OMEdit (r18411) shows to be incorrect in some points (red messages).
Then the generated code does not produce a valid result.

Steps to reproduce the problem:
1) load "pmwpulser.mo"
2) load and run "InvTrifNotWorking.mo"
3) (in OMEdit) look at the red text in the compilation tab in the simulation output window.

I reproduce hereafter the contents of my compilation window.
I added blank rows to put in evidence the text that appears red in OMEdit.
MC

"C:\OpenModelica1.9.1Nightly\\MinGW\bin\mingw32-make.exe" -f invTrifNotWorking.makefile
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking.o invTrifNotWorking.c
************************************************************
invTrifNotWorking.c:1893: warning: initialization from incompatible pointer type
************************************************************
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_functions.o invTrifNotWorking_functions.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_records.o invTrifNotWorking_records.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_01exo.o invTrifNotWorking_01exo.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_02nls.o invTrifNotWorking_02nls.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_03lsy.o invTrifNotWorking_03lsy.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_04set.o invTrifNotWorking_04set.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_05evt.o invTrifNotWorking_05evt.c
************************************************************
invTrifNotWorking_05evt.c: In function 'invTrifNotWorking_zeroCrossingDescription':
invTrifNotWorking_05evt.c:91: warning: assignment discards qualifiers from pointer target type
************************************************************
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_06inz.o invTrifNotWorking_06inz.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_07dly.o invTrifNotWorking_07dly.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_08bnd.o invTrifNotWorking_08bnd.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_09alg.o invTrifNotWorking_09alg.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_10asr.o invTrifNotWorking_10asr.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_11mix.o invTrifNotWorking_11mix.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_12jac.o invTrifNotWorking_12jac.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_13opt.o invTrifNotWorking_13opt.c
gcc   -falign-functions -msse2 -mfpmath=sse    -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME  -c -o invTrifNotWorking_14lnz.o invTrifNotWorking_14lnz.c
gcc -I. -o invTrifNotWorking.exe invTrifNotWorking.o invTrifNotWorking_functions.o invTrifNotWorking_records.o invTrifNotWorking_01exo.o invTrifNotWorking_02nls.o invTrifNotWorking_03lsy.o invTrifNotWorking_04set.o invTrifNotWorking_05evt.o invTrifNotWorking_06inz.o invTrifNotWorking_07dly.o invTrifNotWorking_08bnd.o invTrifNotWorking_09alg.o invTrifNotWorking_10asr.o invTrifNotWorking_11mix.o invTrifNotWorking_12jac.o invTrifNotWorking_13opt.o invTrifNotWorking_14lnz.o -I"C:/OpenModelica1.9.1Nightly//include/omc" -I.  -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME      -falign-functions -msse2 -mfpmath=sse    -L"C:/OpenModelica1.9.1Nightly//lib/omc" -L"C:/OpenModelica1.9.1Nightly//lib" -Wl,--stack,0x2000000,-rpath,"C:/OpenModelica1.9.1Nightly//lib/omc" -Wl,-rpath,"C:/OpenModelica1.9.1Nightly//lib"  -lregex -lexpat -lgc -lpthread -fopenmp -loleaut32  -lSimulationRuntimeC -lgc -lexpat -lregex -static-libgcc -luuid -loleaut32 -lole32 -lws2_32 -lsundials_kinsol -lsundials_nvecserial -lipopt -lcoinmumps -lcoinmetis -lpthread -lm -lgfortranbegin -lgfortran -lmingw32 -lgcc_eh -lmoldname -lmingwex -lmsvcrt -luser32 -lkernel32 -ladvapi32 -lshell32 -llapack-mingw -ltmglib-mingw -lblas-mingw -lf2c -linteractive -lwsock32 -llis -lstdc++

/tmp/OpenModelica/OMEdit/invTrifNotWorking -port=52829 -w -lv=LOG_STATS
stdout            | warning | Failed to solve linear system of equations (no. 146) at time 0.000000, system is singular for U[20, 20].
LOG_LS            | warning | linear system fails: Linear function (index 146, size 24) at t=0
|                 | |       | | [1] upSW.idealOpeningSwitch[1].v
|                 | |       | | [2] upSW.idealOpeningSwitch[1].s
|                 | |       | | [3] upSW.i[1]
|                 | |       | | [4] upSW.idealOpeningSwitch[2].v
|                 | |       | | [5] upSW.idealOpeningSwitch[2].s
|                 | |       | | [6] upSW.i[2]
|                 | |       | | [7] Rf.plug_p.pin[2].v
|                 | |       | | [8] Rf.plug_p.pin[1].v
|                 | |       | | [9] star.pin_n.v
|                 | |       | | [10] downSW.idealOpeningSwitch[3].v
|                 | |       | | [11] downSW.idealOpeningSwitch[3].s
|                 | |       | | [12] downSW.i[3]
|                 | |       | | [13] V1.i
|                 | |       | | [14] upSW.i[3]
|                 | |       | | [15] upSW.idealOpeningSwitch[3].s
|                 | |       | | [16] upSW.idealOpeningSwitch[3].v
|                 | |       | | [17] Rf.plug_p.pin[3].v
|                 | |       | | [18] downSW.idealOpeningSwitch[1].v
|                 | |       | | [19] star1.pin_n.v
|                 | |       | | [20] downSW.idealOpeningSwitch[2].v
|                 | |       | | [21] downSW.idealOpeningSwitch[2].s
|                 | |       | | [22] downSW.i[2]
|                 | |       | | [23] downSW.i[1]
|                 | |       | | [24] downSW.idealOpeningSwitch[1].s
stdout            | warning | Failed to solve linear system of equations (no. 230) at time 0.000000, system is singular for U[21, 21].
stdout            | warning | Error in initialization. Storing results and exiting.
|                 | |       | Use -lv=LOG_INIT -w for more information.
Simulation process exited with code 255

[Martin Sjölund]

There should be no warnings in r18427. But it also won't help with your problem since it is related to a singular linear system being generated.

[massimo ceraolo]

Ah, ok. I hoped it was a much simpler issue.
Just in case it may help, I can tell that the model should be ok: it runs good in Dymola.

[Martin Sjölund]

This ticket was not closed for 1.9.1, which has now been released. It was batch modified for milestone 1.9.2 (but maybe an empty milestone was more appropriate; feel free to change it).

[Martin Sjölund]

Milestone changed to 1.9.3 since 1.9.2 was released.

[Martin Sjölund]

Moved to new milestone 1.9.4

[Martin Sjölund]

Milestone pushed to 1.9.5

[Martin Sjölund]

Milestone renamed

[Martin Sjölund]

Ticket retargeted after milestone closed

[Martin Sjölund]

Milestone moved to 1.12.0 due to 1.11.0 already being released.

[Francesco Casella]

The milestone of this ticket has been reassigned to "Future".

If you think the issue is still valid and relevant for you, please select milestone 1.13.0 for back-end, code generation and run-time issues, or 2.0.0 for front-end issues.

If you are aware that the problem is no longer present, please select the milestone corresponding to the version of OMC you used to check that, and set the status to "worksforme".

In both cases, a short informative comment would be welcome.

[massimo ceraolo]

This ticket is very old, and does not apply anymore to more recent versions of OM.
Please close it as fixed.