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Showing posts with the label Indexing

Pandas Remove Elements From Datetimeindex Per Dates In Other Df Column

Given the following data frame: import pandas as pd df=pd.DataFrame({'A':['a','… Read more Pandas Remove Elements From Datetimeindex Per Dates In Other Df Column

Renaming Pandas Dataframe Indeces Using Index And Column Values

I have a dataframe df df Name 0 A 1 A 2 B 3 B 4 C 5 D 6 E 7 F 8 G 9 H How ca… Read more Renaming Pandas Dataframe Indeces Using Index And Column Values

Python Sqlite3 Not Using Index With Like

I have a table with a single column, which I query in two ways: SELECT * FROM sequences WHERE seqs… Read more Python Sqlite3 Not Using Index With Like

Multiple Slice In List Indexing For Numpy Array

Numpy array admits a list of indices, for example a = np.arange(1000) l = list([1,44,66,33,90,345])… Read more Multiple Slice In List Indexing For Numpy Array

Deleting Masked Elements In Arrays By Index

I have three arrays and one contains masked values based off some condition: a = numpy.ma.MaskedArr… Read more Deleting Masked Elements In Arrays By Index

Numpy: Find The Values Of Rows Given An Array Of Indexes

I have a 2D array of values and a 1D array of indexes. I want to pull the values from the index of … Read more Numpy: Find The Values Of Rows Given An Array Of Indexes

Select Only One Index Of Multiindex Dataframe

I am trying to create a new DataFrame using only one index from a multi-indexed DataFrame. … Read more Select Only One Index Of Multiindex Dataframe

Filtering Based On The "rows" Data After Creating A Pivot Table In Python Pandas

I have a set of data that I'm getting from a SQL database and reading into a pandas dataframe. … Read more Filtering Based On The "rows" Data After Creating A Pivot Table In Python Pandas

How To Get Index Number Of Rows With Condition In Pandas

I have one dataframe in which I need to do comparison with Date column with conditions and need to … Read more How To Get Index Number Of Rows With Condition In Pandas

Interleaving 2 Lists Of Unequal Lengths

I want to be able to interleave two lists that could potentially be unequal in length. What I have … Read more Interleaving 2 Lists Of Unequal Lengths

How To Find The First Index Of Any Of A Set Of Characters In A String

I'd like to find the index of the first occurrence of any “special” character in a string, like… Read more How To Find The First Index Of Any Of A Set Of Characters In A String

Search A List For Item(s)and Return X Number Of Surrounding Items In Python

I want to search a list for the occurence of a value (x) and return that value and a number, say 2,… Read more Search A List For Item(s)and Return X Number Of Surrounding Items In Python

Typeerror: 'githubiterator' Object Does Not Support Indexing

Using github3.py, I want to retrieve the last comment in the list of comments associated with a pul… Read more Typeerror: 'githubiterator' Object Does Not Support Indexing

Calculating Year Over Year Growth By Group In Pandas

I have the following dataframe: In [1]: df Out[1]: ID Month Transaction_Amou… Read more Calculating Year Over Year Growth By Group In Pandas

What Is The Way To Add An Index Column In Dask When Reading From A Csv?

I'm trying to process a fairly large dataset that doesn't fit into memory using Pandas when… Read more What Is The Way To Add An Index Column In Dask When Reading From A Csv?

Numpy Array Indexing With Other Arrays Yields Broadcasting Error

I have two indexing arrays. elim=range(130,240) tlim=range(0,610) The array to be indexed, I, has… Read more Numpy Array Indexing With Other Arrays Yields Broadcasting Error

How To Remove The Index Name In Pandas Dataframe?

In my dataframe, I get a '2' written over my index column's name. when I check for the … Read more How To Remove The Index Name In Pandas Dataframe?

Select Individual Rows From Multiindex Pandas Dataframe

I am trying to select individual rows from a multiindex dataframe using a list of multiindices. For… Read more Select Individual Rows From Multiindex Pandas Dataframe

Getting Indices When Comparing Multidimensional Arrays

I have two numpy arrays, one an RGB image, one a lookup table of pixel values, for example: img = n… Read more Getting Indices When Comparing Multidimensional Arrays

"indexerror: Too Many Indices" In Numpy Python

I know many people asked this question, but I could not get an appropriate answer that can solve my… Read more "indexerror: Too Many Indices" In Numpy Python