Examples of how to replace some elements of a matrix using numpy in python: Replace some elements of a 1D matrix ; Replace some elements of a 2D matrix; Using multiple conditions; Using the numpy function where; References; Replace some elements of a 1D matrix. In this article we will discuss different ways to remove multiple elements from list.

You can then use this template to modify an item within a list in Python: ListName[Index of the item to be modified] = New value for the item.

The list defined above has items that are all of the same type (int), but all the items of a list do not need to be of the same type as you can see below. Python. Let's try to replace the elements of a matrix called M strictly lower than 5 by the value -1: >>> import numpy as np >>> M = …

You can simply use list comprehension in python: def replace_element(YOUR_LIST, set_to=NEW_VALUE): return [i if SOME_CONDITION else NEW_VALUE for i in YOUR_LIST] for your case, where you want to replace all occurrences of 1 with 10, the code snippet will be like this: It is important to note that python is a zero indexed based language. So, to find other occurrences of item in list, we …

# Define a list heterogenousElements = [3, True, 'Michael', 2.0] The list contains an int, a bool, a string, and a float. Could you suggest how to implement this into a statement that would enable one to replace all values less than a certain value by None (32, 46 => None), and then subtract the rest of the lists by another value? #5 Alexander Artemenko commented on 2008-08-27 : Some offtopic. Find all indexes of an item in list using list.index() As list.index() returns the index of first occurrence of an item in list. 2018-05-08T07:01:40+05:30 List, Python No Comment. Let’s say that you want to change the third item in the list from ‘Maria’ to ‘Mona.’ In that case, the third item in the list has an index of 2. Access Values in a List. def replace_all(word_list, dictionary): for i, j in dictionary.iteritems(): for lst in word_list: if i in set(lst): lst[lst.index(i)] = j replace_all(list_, dictionary) python beginner performance. I'm new to Python and I would appreciate if someone could suggest whether there's a way to do this task much faster/more efficiently. For multiple ifs, you can write separate function and pass it to the map or in the list comprehension instead of lambda. All this … 2 # List of Numbers. Each item in a list has an assigned index value. Suppose we have a list of numbers i.e. 1. Varun May 8, 2018 Python : How to remove multiple elements from list ? Approach #2 : Pythonic Naive This is another naive approach, but more pythonic.For every inner list, it returns the i th position (which is its ordinal number) and then multiplies it with the length of that particular inner list in order to return the desired output.