Dataframe get index by condition
WebJan 11, 2024 · you can use .flatMap (lambda x: x).collect () to convert the above selected column dataframe to list. There is no such thing as indices in Spark DataFrame. Same as SQL tables, DataFrame is unordered, unless sorted specifically. There is a row_number window function, but it is not intended for global orderings. WebJun 10, 2024 · Let’s see how to Select rows based on some conditions in Pandas DataFrame. Selecting rows based on particular column value using '>', '=', '=', '<=', '!=' operator. Code #1 : Selecting all the rows from the …
Dataframe get index by condition
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WebApr 9, 2024 · Method1: first drive a new columns e.g. flag which indicate the result of filter condition. Then use this flag to filter out records. I am using a custom function to drive flag value. Web37. I am looking for a condition which will return the index of a vector satisfying a condition. For example- I have a vector b = c (0.1, 0.2, 0.7, 0.9) I want to know the first index of b for which say b >0.65. In this case the answer should be 3. I tried which.min (subset (b, b > 0.65)) But this gives me 1 instead of 3.
WebIndexing and selecting data #. Indexing and selecting data. #. The axis labeling information in pandas objects serves many purposes: Identifies data (i.e. provides metadata) using known indicators, important for … WebJan 29, 2024 · This is not a correct answer. This would also return rows which index is equal to x (i.e. '2002-1-1 01:00:00' would be included), whereas the question is to select rows which index is larger than x. @bennylp Good point. To get strictly larger we could use a +epsilon e.g. pd.Timestamp ('2002-1-1 01:00:00.0001')
WebAug 20, 2013 · I'm impressed with all the answers here. This is not a new answer, just an attempt to summarize the timings of all these methods. I considered the case of a series with 25 elements and assumed the general case where the index could contain any values and you want the index value corresponding to the search value which is towards the …
WebAug 2, 2024 · Sorted by: 4 You can add the following code: Retrieve the index based on the condition. Assumes constant increasing down the channels. lower_channel_energy = df …
WebA better testcase is s = pd.Series ( [True, False, True, True, False, False, False, True], index=list ('ABCDEFGH')). Expected output: Index ( ['A', 'C', 'D', 'H'], ...). Since some solutions (esp. all the np functions) drop the index and use the autonumber index. – smci Apr 21, 2024 at 22:42 smith loginWebHere’s an example code to convert a CSV file to an Excel file using Python: # Read the CSV file into a Pandas DataFrame df = pd.read_csv ('input_file.csv') # Write the DataFrame to … rivdew caninesWebJun 20, 2013 · df = pd.DataFrame (np.random.rand (10,2),columns=list ('AB')) You can use query instead of a lot of nested brackets: df.query ('B>0.5').index.tolist () # it prints [0, 7, 8, 9] Share Improve this answer Follow answered Mar 20, 2024 at 12:36 Hamzah 7,565 3 15 41 Add a comment Your Answer Post Your Answer rivcrete ready mixWebJan 20, 2016 · Result: dataframe. which (df == "2") #returns rowIndexes results from the entire dataset, in this case it returns a list of 3 index numb. Result: 5 13 17. length (which (df == "2")) #count numb. of rows that matches a condition. Result: 3. You can also do this column wise, example of: smith logistics miamiWebMay 24, 2013 · I have constructed a condition that extracts exactly one row from my data frame: d2 = df [ (df ['l_ext']==l_ext) & (df ['item']==item) & (df ['wn']==wn) & (df ['wd']==1)] Now I would like to take a value from a particular column: val = d2 ['col_name'] But as a result, I get a data frame that contains one row and one column (i.e., one cell). smithlord banthaWebDataFrame.where(cond, other=_NoDefault.no_default, *, inplace=False, axis=None, level=None) [source] #. Replace values where the condition is False. Where cond is True, keep the original value. Where False, replace with corresponding value from other . If cond is callable, it is computed on the Series/DataFrame and should return boolean Series ... rive3x7g icloud.comWebOct 5, 2024 · In this program, we will discuss how to get the index of the maximum value in Pandas Python. In Python Pandas DataFrame.idmax () method is used to get the index of the first occurrence of maximum over the given axis and this method will always return the index of the maximum value and if the column or row in the Pandas DataFrame is … riveagc