Writing code in comment? Construct a matrix with sum equal to the sum of diagonal elements, Rearrange Odd and Even values in Alternate Fashion in Ascending Order, Generate an alternate increasing and decreasing Array, Maximize sum of N X N upper left sub-matrix from given 2N X 2N matrix, Create matrix whose sum of diagonals in each sub matrix is even, Construct a square Matrix whose parity of diagonal sum is same as size of matrix, Arrange N elements in circular fashion such that all elements are strictly less than sum of adjacent elements, Minimum difference between adjacent elements of array which contain elements from each row of a matrix. . Asking for help, clarification, or responding to other answers. The problem of getting summation of a list is quite generic and we might some day face the issue of getting the summation of alternate elements and get the list of 2 elements containing summation of alternate elements.
Python's sum() function returns the sum of numbers in an iterable. What does " Y axis" mean in continuous probability distribution?
. For a flat list, dict you cannot do better than O(n) because you have to look at each item in the list to add them up. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.
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The sum() function returns a number, the sum of all items in an iterable. Experience.
To concatenate a series of iterables, consider using itertools.chain().
Writing efficient and meaningful code should be part of the exercise. How to make a flat list out of list of lists? Given an NxN matrix. To learn more, see our tips on writing great answers. See your article appearing on the GeeksforGeeks main page and help other Geeks. equals -1, so you just floor divide by 2 and multiply by -1.
The idea is to traverse the matrix and also keep a counter. Another way can be using the zip builtin, But this works only for an even range.
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Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Method #1 : Using list comprehension + list slicing + sum() Are environmentalists responsible for Californian forest fires? To add floating point values with extended precision, see math.fsum(). Method #2 : Using loop
tried this...i = 1 j = 2 while j <= 6: sum = i/j i = i + 1 j = j + 1 print(sum), In your original code replace the "sum = sum + i" with "sum = sum + i/(i+1)" and of course change the while to "while i <= 5".
4,720 5 5 gold badges 37 37 silver badges 46 46 bronze badges. I know how to get the sum of numbers from 1 to a particular number by using while loop in this way: i = 1 sum = 0 while i<= 10: sum = sum + i i = i + 1 print(sum) python list. Note: Here the iterable maybe Python list, tuple, set, or dictionary. With list slicing and range. Experience. Is there a noun for a man who wrote a best-seller book? brightness_4
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Given a list of numbers in this article we are going to calculate the sum of alternate elements in that list. Thanks for contributing an answer to Stack Overflow! Given a list of numbers in this article we are going to calculate the sum of alternate elements in that list. Python 3 comes with many built-in functions that you can readily use in any program that you’re working on. . List slicing clubbed with list comprehension can be used to perform this particular task. This is the brute method to perform this particular task in which we have the … acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Write a program to reverse an array or string, Find the smallest and second smallest elements in an array, Stack Data Structure (Introduction and Program), K'th Smallest/Largest Element in Unsorted Array | Set 1, Search an element in a sorted and rotated array, Count Inversions in an array | Set 1 (Using Merge Sort), Find subarray with given sum | Set 1 (Nonnegative Numbers), Given an array A[] and a number x, check for pair in A[] with sum as x, Sliding Window Maximum (Maximum of all subarrays of size k), k largest(or smallest) elements in an array | added Min Heap method, Queue | Set 1 (Introduction and Array Implementation), Minimum number of swaps required to sort an array, Program to print elements of a Matrix row-wise skipping alternate elements, Print a matrix in alternate manner (left to right then right to left), Generate all possible sorted arrays from alternate elements of two given sorted arrays, Find the Maximum Alternate Subsequence Sum from a given array. Given you are trying to alternate the sign you can use the fact that (-1)**n also alternates the sign.
This list I then traversed to get the even numbers and added them up. By using our site, you
In the case of the Python dictionary, the key to the dictionary will get added. iterable - iterable (list, tuple, dict, etc).
Finally giving a list which shows sum of elements at odd position and sum of elements at even position. Stack Overflow for Teams is a private, secure spot for you and It looked like this. rev 2020.10.9.37784, Sorry, we no longer support Internet Explorer, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. For some use cases, there are good alternatives to sum().
Use the percentage operator to separate the numbers at Even and Odd positions.
F(i) refers to the i’th Fibonacci number. . Every second number and also use the range function along with length function to get the number of elements to be summed. But you want a negative when n is even you will need (-1)**(n-1): This can be turned into an explicit looping solution with: There are more pythonic ways to do what you requested - but they will require a little more knowledge.. To expand this to a much easier, linear solution that works for any n series like this: Every pair of numbers (1 - 2) + (3 - 4) + etc.
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