I want to use python to some calculations and put the array data to r to get some plot.
For 1-dim array, I can use FloatVector to get right answer, but n-dim array error
(run following code)
(2-dim array)
import numpy as np from rpy2.robjects.vectors import FloatVector x = np.array([[1, 2], [3, 4]]) X = FloatVector(x)
error information:
`Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "D:\Program\Anaconda3\lib\site-packages\rpy2\robjects\vectors.py", line 456, in __init__
obj = FloatSexpVector(obj)
ValueError: Error while trying to convert element 0 to a double.`
Using numpy2ri could make error in some plot orders(like ggplot2)
I'd like to doing these all in spyder.
The conversion mechanism can be your friend:
from rpy2.robjects.conversion import localconverter
from rpy2.robjects import numpy2ri
with localconverter(numpy2ri.converter) as cv:
X = cv.py2ro(x) # convert from *py*thon to *ro*bjects
Otherwise, this is happening because rpy2 is trying to iterate through the sequence x
(the default behavior without interaction with numpy requested) and make each element through the iteration an R/rpy2 object. Here it does not work because x[i]
is turned to a FloatVector
and you cannot have a FloatVector
of FloatVector
elements (you could have a list of FloatVector though). Explictly, this is what is happening (and you'll trigger the same error):
FloatVector([FloatVector(y) for y in x])
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