I'm writing a function part of which should iterate through the rows of a Series. The function should iterate through rows of a DataFrame column passed to it i.e. df['col'], however when I try to use .iterrows I get an error that a Series doesn't have that attribute and using .iteritems produces the error below. Are there any other ways to iterate through rows of a column? I need do be able to access the index and column value.
def get_RIMsin(df, obs, rimcol):
"""dataframe, obs column,rim column"""
maxval =df['Mmedian'].max()
minval =df['Mmedian'].min()
dfrange = maxval-minval
amplitude = dfrange/2
convert = (2*np.pi)/365
startday = obs.idxmax().dayofyear
sinmax = 91
for row in rimcol.iteritems: #This is where I'd like to go through rows of a series
diff = sinmax - startday
adjday = row.dayofyear + diff
adjsin = np.sin(adjday * convert)
df['RIMsine'] = row + adjsin
return df
get_RIMsin(sve_DOC, sve_DOC['DOC_mg/L'], sve_DOC['RIMsDOC'])
TypeError Traceback (most recent call last)
<ipython-input-98-4811cbf80e78> in <module>()
17 return df
18
---> 19 get_RIMsin(sve_DOC, sve_DOC['DOC_mg/L'], sve_DOC['RIMsDOC'])
20 """get_RIM2(svv_DOC, svv_DOC['DOC_mg/L'], svv_DOC['RIMsDOC'])
21 get_RIM2(svw_DOC, svw_DOC['DOC_filt_mg/l'], svw_DOC['RIMsDOC'])
<ipython-input-98-4811cbf80e78> in get_RIMsin(df, obs, rimcol)
10 sinmax = 91
11
---> 12 for row in rimcol.iteritems:
13 diff = sinmax - startday
14 adjday = row.dayofyear + diff
TypeError: 'instancemethod' object is not iterable
None of this actually required row iteration, as Ryan G pointed out in the comments. I think this (untested!) code is equivalent.
convert = (2*np.pi)/365
sinmax = 91
def get_RIMsin(df, obs, rimcol):
"""dataframe, obs column,rim column"""
amplitude = df['Mmedian'].ptp()/2
startday = obs.idxmax().dayofyear
diff = sinmax - startday
adjday = rimcol + diff
adjsin = np.sin(adjday * convert)
df['RIMsine'] = adjsin
return df
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