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Remove all occurences of an element from vector in O(n) complexity
Suppose we have a vector of integers and we want to delete all occurences of a number from it i.e. Let’s say vector contain following numbers 1,2,5,4,5,1,5,7,8,9. Now we want to delete all the occurences of 5 from it, so that vector contents should become – 1 2 4 1 7 8 9 . Also …
Remove all occurences of an element from vector in O(n) complexityRead More
Restrict dynamic deletion of objects created on stack
Many times we encounter a situation where we need to delete a pointer but we are not sure that how this pointer is created i.e. either on Heap or on stack. Check out this function, Advertisements class Dummy; void deletePointer(Dummy * ptr) { // Do you know this passed pointer was // created on heap …
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How to remove elements from a List based on value or External Criterion
In this article we will discuss how to remove an element from a List by matching a value or by matching some criterion. std::list provides two member functions for removing elements based on value i.e. std::list::remove and std::list::remove_if. Advertisements Using std::list::remove to remove element by value void remove (const value_type& val); It removes all the elements …
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Pandas – Select Rows by conditions on multiple columns
In this article we will discuss different ways to select rows in DataFrame based on condition on single or multiple columns. Following Items will be discussed, Advertisements Select Rows based on value in column Select Rows based on any of the multiple values in column Select Rows based on any of the multiple conditions on …
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Python Pandas : How to Drop rows in DataFrame by conditions on column values
In this article we will discuss how to delete rows based in DataFrame by checking multiple conditions on column values. DataFrame provides a member function drop() i.e. Advertisements DataFrame.drop(labels=None, axis=0, index=None, columns=None, level=None, inplace=False, errors=’raise’) It accepts a single or list of label names and deletes the corresponding rows or columns (based on value of axis …
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Pandas : Find duplicate rows based on all or few columns
In this article we will discuss ways to find and select duplicate rows in a Dataframe based on all or given column names only. DataFrame.duplicated() In Python’s Pandas library, Dataframe class provides a member function to find duplicate rows based on all columns or some specific columns i.e. Advertisements DataFrame.duplicated(subset=None, keep=’first’) It returns a Boolean …
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Pandas: Sort rows or columns in Dataframe based on values using Dataframe.sort_values()
In this article we will discuss how to sort rows in ascending and descending order based on values in a single or multiple columns . Also, how to sort columns based on values in rows using DataFrame.sort_values() DataFrame.sort_values() In Python’s Pandas library, Dataframe class provides a member function to sort the content of dataframe i.e. Advertisements …
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Pandas : Merge Dataframes on specific columns or on index in Python – Part 2
In this article we will discuss how to merge dataframes on given columns or index as Join keys. First let’s get a little intro about Dataframe.merge() again, Advertisements Dataframe.merge() In Python’s Pandas Library Dataframe class provides a function to merge Dataframes i.e. DataFrame.merge(right, how=’inner’, on=None, left_on=None, right_on=None, left_index=False, right_index=False, sort=False, suffixes=(‘_x’, ‘_y’), copy=True, indicator=False, validate=None) …
Pandas : Merge Dataframes on specific columns or on index in Python – Part 2Read More
Pandas : Sort a DataFrame based on column names or row index labels using Dataframe.sort_index()
In this article we will discuss how to sort the contents of dataframe based on column names or row index labels using Dataframe.sort_index(). Dataframe.sort_index() In Python’s Pandas Library, Dataframe class provides a member function sort_index() to sort a DataFrame based on label names along the axis i.e. Advertisements DataFrame.sort_index(axis=0, level=None, ascending=True, inplace=False, kind=’quicksort’, na_position=’last’, sort_remaining=True, …
Python : Filter a dictionary by conditions on keys or values
In this article we will discuss different ways to filter contents from a dictionary by conditions on keys or value or on both. Suppose we have a dictionary in which int type element is key and string type elements are value i.e. Advertisements dictOfNames = { 7 : ‘sam’, 8: ‘john’, 9: ‘mathew’, 10: ‘riti’, …
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