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Python parser for CarMaker ERG files
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danielhrisca/cmerg
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Python parser for CarMaker ERG files with Pandas DataFrame export.
Mostly these are notes for myself but hopefully someone else finds them useful.
This packageis published on PyPI under the namecmerg.
> python -m pip install -U pip> python -m pip install cmerg
$ python3 -m pip install -U pip$ python3 -m pip install cmerg
Import the package folder.
import cmerg
Create ERG file object. (Using example file from repo)
log1 = cmerg.ERG('test-data/Test-Dataset-1_175937.erg')
Dictionary of the signals in the file.
log1.signals
Save the vehicle speed signal to a variable.
speed = log1.get('Vhcl.v')
Plot signal.
speed.plot()
Add signal to DataFrame.
# New easy call to return a pandas DataFrame.df=log1.to_pd()
# Simple example of adding ERG data to pandas.importcmergimportpandasaspdimportnumpyasnplog1=cmerg.ERG('data-file.erg')speed=log1.get('Vhcl.v')t=np.array(speed.timestamps)spd=np.array(speed.samples)df=pd.DataFrame({'time':t,'speed':spd})
Export ERG file to CarMaker compliant csv (e.g. for import usingImport from File)
log1=cmerg.ERG('data-file.erg')log1.export_cm_csv("./target.csv")# it's also possible to export only quantities that matches a namespace:log1.export_cm_csv("./target.csv",columns_filter=["Car_"])# CM's Import from File cannot handle many digits well, therefore the exported values are rounded. The number of digits can be sepcified:log1.export_cm_csv("./target.csv",columns_filter=["Car_"],digits=5)