我試圖通過Rpy2 Python中調用R函數loess
這個數據文件:http://filebin.ca/azuz9Piv0z8/test.data通過Python在黃土功能rpy2/R問題?
它的工作原理,當我使用的數據(第1000點),但一個子集,當我嘗試使用整個文件,我收到一個錯誤。我的代碼:
import pandas
from rpy2.robjects import r
import rpy2.robjects as robjects
data = pandas.read_table(os.path.expanduser("~/test2.data"), sep="\t").values
small_data = data[0:1000, :]
print "small data loess:"
a, b = robjects.FloatVector(list(small_data[:, 0])), \
robjects.FloatVector(list(small_data[:, 1]))
df = robjects.DataFrame({"a": a, "b": b})
loess_fit = r.loess("b ~ a", data=df)
print loess_fit
print "large data loess:"
a, b = robjects.FloatVector(list(data[:, 0])), \
robjects.FloatVector(list(data[:, 1]))
df = robjects.DataFrame({"a": a, "b": b})
loess_fit = r.loess("b ~ a", data=df)
print loess_fit
配件上small_data
作品,但不data
。我收到錯誤:
Error in simpleLoess(y, x, w, span, degree, parametric, drop.square, normalize, :
NA/NaN/Inf in foreign function call (arg 1)
loess_fit = r.loess("b ~ a", data=df)
File "/usr/local/lib/python2.7/dist-packages/rpy2-2.3.3-py2.7-linux-x86_64.egg/rpy2/robjects/functions.py", line 86, in __call__
return super(SignatureTranslatedFunction, self).__call__(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rpy2-2.3.3-py2.7-linux-x86_64.egg/rpy2/robjects/functions.py", line 35, in __call__
res = super(Function, self).__call__(*new_args, **new_kwargs)
rpy2.rinterface.RRuntimeError: Error in simpleLoess(y, x, w, span, degree, parametric, drop.square, normalize, :
NA/NaN/Inf in foreign function call (arg 1)
這怎麼解決?我不確定這是R函數loess
還是與Rpy2接口有關的問題?謝謝。
謝謝!只是注意到它 - 奇怪,因爲我在'pandas'之前做了'dropna()'。有沒有辦法使「黃土」適合NA值,或者我應該預先將它們移除 – user248237dfsf 2013-03-21 21:00:15
「Inf」與「NA」不同。 「黃土」對後者處理得很好(參見它的'na.action'參數)。你可以使用DF [!is.finite(DF [,1])|) !is.finite(DF [,2]),] < - NA'。 – Roland 2013-03-21 21:03:07
'inf'和'-inf'不被認爲是熊貓的缺失值,參見:http://pandas.pydata.org/pandas-docs/stable/missing_data.html,所以'dropna()'不會有任何影響。 – herrfz 2013-03-21 21:04:25