Error loading tables in .csv files

[davidetom99]

I have experienced the following error using the ModelicaStandardLibrary 4.1.0 while loading a table stored in a csv file using the component combiTimeTable (Modelica.Blocks.Sources.CombiTimeTable). This combiTimeTable is placed inside a component of the library Buildings 10.0.0.

Log-file of program ./dymosim
(generated: Fri Feb 20 08:00:03 2026)

dymosim started
... "Test" simulating
... "dsin.txt" loading (dymosim input file)
... loading "Values" from "C:/.../data/tcDat.csv"
Warning: The following error was detected at time: 0
Error in line 1 when reading numeric data of matrix "Values(8766,1)" from file "C:/.../data/tcDat.csv"

The stack of functions is:
Modelica.Blocks.Types.ExternalCombiTimeTable
Modelica.Blocks.Types.ExternalCombiTimeTable((if radHea.loa.tableOnFile then (if radHea.loa.isCsvExt then "Values" else radHea.loa.tableName) else "NoName"), (if radHea.loa.tableOnFile and radHea.loa.fileName <> "NoName" and  not Modelica.Utilities.Strings.isEmpty(radHea.loa.fileName) then radHea.loa.fileName else "NoName"), radHea.loa.table, radHea.loa.startTime/radHea.loa.timeScale, radHea.lo...

Error: Integrator failed to start model.

... Error message from dymosim

ERROR: The simulation of Test FAILED

The table is loaded correctly using the library 4.0.0 and no error is raised.
The structure of the csv is the same. Here it is:

#1
double tcDat(8760, 2)
#starts on 01/01/2022 00:00 - steps of 1h
#Peak space heating load = 83400.0 Watts
#time [s], thermal load [W]
#TC, y[1]
0,38900
3600,38900
7200,38900
....

what has changed in the combiTimeTable between MSL4.0.0 and 4.1.0?

[beutlich]

Thanks for the report.

The table is loaded correctly using the library 4.0.0 and no error is raised.

That can be seen as regression.

what has changed in the combiTimeTable between MSL4.0.0 and 4.1.0?

That's all stated in the changelogs where we have put quite some effort.

The structure of the csv is the same. Here it is:

That file was recognized as DLR matrix text format in MSL v4.0.0 but is recognized as CSV format in MSL > v4.0.0 because of the file extension .csv. To fix the read error in MSL v4.1.0 you can either change the extension to something different than .csv or .mat, say .txt, or keep the .csv extension and set nHeaderLines=6 to skip the first six lines

#1
double tcDat(8760, 2)
#starts on 01/01/2022 00:00 - steps of 1h
#Peak space heating load = 83400.0 Watts
#time [s], thermal load [W]
#TC, y[1]