Error: Illegal range lower

Question

Hi everybody,

I am getting a strange error message, when I am calculating the impacts of my process:

An error has occurred. See error log for more details.
Illegal range: lower=NaN, upper=NaN

Furthermore, the graphs of all impacts look wrong (same heights, and no connection to any category). I have looked in the forum, but haven´t found an answer yet. None of my impacts streams are zero and I have closed and opended openLCA multiple times.

I would appreciate your help :)

Comments

Hi François,

this is what it looks like:

Date    Level    Logger    Message
08:36:27    INFO    org.openlca    set log-level=INFO
08:36:27    INFO    org.openlca.app.rcp.RcpActivator    start openLCA 2.0.0, install location=C:\Program Files (x86)\openLCA, workspace=C:\Users\abecker\openLCA-data-1.4
08:36:27    INFO    org.openlca.nativelib.NativeLib    load native libraries from C:\Program Files (x86)\openLCA\olca-native\0.0.1\x64
08:36:27    INFO    org.openlca.app.App    loaded native libraries; with UMFPACK=false
08:36:34    INFO    org.openlca.core.database.Derby    initialize database folder C:\Users\abecker\openLCA-data-1.4\databases\ecoinvent_391_cutoff_upr_n2_amrei_18_05_1, create=false
08:37:31    INFO    org.openlca.core.math.SystemCalculator    calculate result for RootEntity [type=Process, refId=1d57c973-328e-4153-abe1-53ca7cb23e6a, name=Glycolysis - case 1 (PET100) DE]
08:38:22    INFO    org.openlca.core.math.SystemCalculator    selected provider org.openlca.core.results.providers.FactorizationSolver@4ad853ef
08:38:55    ERROR    org.openlca.app.results.InfoPage    Matrix error: the matrix is probably singular.

Processes, which I haven´t touched and which worked 2 days ago all get the same error message.

Answer 1

Hi amreibe,

This suggests that your technosphere matrix contains linearly dependent rows or columns (cf. post). This issue can arise if you use a parameter set to zero, resulting in a row or column composed entirely of zeros.

I recommend downloading the latest version of openLCA, which provides more comprehensive warnings about such issues.

Regards,

François

Comments

Dear François,
thank so much. Installing the lastest version of openLCA helped without changing anything in the model (no values were zeros anyways).
Best, Amrei