An error occurred when calling lavaan with rpy2.

[Wojuer]

Dear list,

I tried to use python for validity analysis, so I used rpy2 to call the lavaan package in R for calculation. When I call other packages of R, I can display success. Only the lavaan package can't run. What should I do if you have this situation?  Code show as below:

[In]:    from rpy2.robjects.packages import importr

         lavaan = importr('lavaan')

[Out]:   ---------------------------------------------------------------------------

RRuntimeError                             Traceback (most recent call last)
<ipython-input-93-71e6d20e5e18> in <module>
      1 from rpy2.robjects.packages import importr
----> 2 lavaan = importr('lavaan')

C:\ProgramData\Anaconda3\lib\site-packages\rpy2\robjects\packages.py in importr(name, lib_loc, robject_translations, signature_translation, suppress_messages, on_conflict, symbol_r2python, symbol_check_after, data)
    451     if _package_has_namespace(rname, 
    452                               _system_file(package = rname)):
--> 453         env = _get_namespace(rname)
    454         version = _get_namespace_version(rname)[0]
    455         exported_names = set(_get_namespace_exports(rname))

RRuntimeError:

Any help would be much appreciated.

[Jeremy Miles]

This looks to me like a problem with python, not lavaan.

The error is being thrown in this file: http://rpy.sourceforge.net/rpy2/doc-2.4/html/_modules/rpy2/robjects/packages.html (it appears), at the line that says:

env = _get_namespace(rname)

Further up, it says:

_get_namespace = rinterface.baseenv['getNamespace']

So that's not working. The python package maintainer might be able to help. You might want to say what the runtime error actually is. 

Jeremy

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[Wojuer]

Thank you for your answer，In my case, when I use Rpy2 to call the R package, most of the packages can be successfully called. There are some packages that can't be called before. The result is the same as the above, but when I will package After the folder is copied in the library under Anaconda, it can be called successfully, but lavaan and sem are still called in this way, so I want to know how to call lavaan successfully.

在 2019年8月1日星期四 UTC+8上午1:03:25，Jeremy Miles写道：

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