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.