Given a list of numbers, the task is to write a Python program to find the second largest number in the given list. How can I find the shortest path visiting all nodes in a connected graph as MILP? Write a Python Program to find the Largest Number in a List with a practical example. What you do seems overly complex. Use heapq.nlargest with key = fr.__getitem__: it's always easy to convert the list to numpy array and deal with it. This should spilt your code up to achieve: Are self-signed SSL certificates still allowed in 2023 for an intranet server running IIS? I can't see efficiency is of all that much concern here. Which generations of PowerPC did Windows NT 4 run on? What is the use of explicitly specifying if a function is recursive or not? Did active frontiersmen really eat 20,000 calories a day? To find the second largest element in a list using a heap, we can first build a max heap using the elements in the list. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I will choose the smaller number from two of them. Were all of the "good" terminators played by Arnold Schwarzenegger completely separate machines? Given below is an O (n) algorithm to do the same. Location of N max values in a python list? Asking for help, clarification, or responding to other answers. Do the 2.5th and 97.5th percentile of the theoretical sampling distribution of a statistic always contain the true population parameter? Potentional ways to exploit track built for very fast & very *very* heavy trains when transitioning to high speed rail? Potentional ways to exploit track built for very fast & very *very* heavy trains when transitioning to high speed rail? Could the Lightning's overwing fuel tanks be safely jettisoned in flight? @arshajii -- I've posted an O(n) solution, so did Alex Thornton (although without the indices), @DavidEhrmann it's a list of 5 small numbers, the language is Python. Relative pronoun -- Which word is the antecedent? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. After I stop NetworkManager and restart it, I still don't connect to wi-fi? I'm amazed that most answers (except by Christian) didn't try to answer OP's real question of finding the solution using divide-and-conquer approach. Like, min_number, current_number, counter, first_largest, etc.. Just x, a, my_var are not self-explanatory. Maybe you can get an idea from this, Can you give more explanation? Thanks! python - Taking a list of numbers and finding the two largest - Code is there a limit of speed cops can go on a high speed pursuit? Can YouTube (e.g.) Global control of locally approximating polynomial in Stone-Weierstrass? rev2023.7.27.43548. How do I clone a list so that it doesn't change unexpectedly after assignment? Here is my program, irrespective of complexity, Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to help my stubborn colleague learn new ways of coding? Apart from these two, you can use the for loop or while loop to iterate the list items and if statement to find the . How do I split a list into equally-sized chunks? The sorted() function is used to sort the list in descending order, and the sorted list is assigned to a new variable named list1. :-) Thanks! It has to be really basic methods for lists. How do I make a flat list out of a list of lists? If I allow permissions to an application using UAC in Windows, can it hack my personal files or data? args = list (args) if args: max1 = max (args) args.remove (max1) print (max1) if args: max2 = max (args) args.remove (max2) print (max2) args = tuple (args) # if a tuple is required. Connect and share knowledge within a single location that is structured and easy to search. Can you have ChatGPT 4 "explain" how it generated an answer? "Who you don't know their name" vs "Whose name you don't know". Given a list of integers, the task is to find N largest elements assuming size of list is greater than or equal o N. Examples : Input : [4, 5, 1, 2, 9] N = 2 Output : [9, 5] Input : [81, 52, 45, 10, 3, 2, 96] N = 3 Output : [81, 96, 52] A simple solution traverse the given list N times. You mind though explaining how it works? 3n/2-2 means that we can have odd amount of numbers in a list right? Python | Indices of N largest elements in list - GeeksforGeeks Can a lightweight cyclist climb better than the heavier one by producing less power? Moving onto twoLargest, it doesn't work with a generator, as you don't cast numList to a list. Please don't add clarification in comments; edit the original question. python; dictionary; max; Share. Because -8 < -7, Python replaces your start value with 0, which results in a slice that contains the items from 0 to the end of the list. I need to find the maximum difference in a list between any two elements. But can you divide list into two parts, find max element of those two parts, and then compare two numbers? Thank you for your valuable feedback! Calling sorted changes this from an O(n), constant memory problem to an O(n log n), O(n log n) memory one. I would remove unnecessary comments. You can try to understand the code and change it to take the two largest. Were all of the "good" terminators played by Arnold Schwarzenegger completely separate machines. Your email address will not be published. Instead of num = 10000 you can use num = float('inf') or in Python 3.5: Var names, instead of x or num try with names that means something. @justhalf I think nobody understands my question. Share Improve this answer Follow And what is a Turbosupercharger? Not the answer you're looking for? If I would only focus on the max. What do you understand from that error message? Am I betraying my professors if I leave a research group because of change of interest? Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. This could be a way (probably not the most efficient). Algebraically why must a single square root be done on all terms rather than individually? To learn more, see our tips on writing great answers. The original list is printed using the print() function and the list variable. However, it'd be fine to calculate it outside like: Hey, so I've tried this option myself. Sorting the List The other option that immediately popped into my mind was to sort the list. One approach is to use a heap data structure. What mathematical topics are important for succeeding in an undergrad PDE course? Making statements based on opinion; back them up with references or personal experience. But the output is not showing groupwise i.e. How to get the max value from a dictionary inside of a dictionary? acknowledge that you have read and understood our. To learn more, see our tips on writing great answers. If repeated usage of these functions is required, consider turning the iterable into an actual heap. So, to remove an element you first change the tuple to list, remove the element from the list and change it back to tuple. The group of row indexes will keep on repeating for 'n'number of times. Can Henzie blitz cards exiled with Atsushi? There is a python function to handle this, 3.) New! What is the least number of concerts needed to be scheduled in order that each musician may listen, as part of the audience, to every other musician? (Irrespective of + or - sign). If I would only focus on the max. larger is a second largest in part lol I wanted just divide a list into two parts, find largest and larger in each part(overall 4 numbers from two parts) and then find the second largest from 4 numbers)))). Python3 test_list = [5, 6, 10, 4, 7, 1, 19] Connect and share knowledge within a single location that is structured and easy to search. What if both are in the same part of the list? Why do we allow discontinuous conduction mode (DCM)? New! The dictionary count is along the lines of {'a': 100, 'b': 210}, and so on. The British equivalent of "X objects in a trenchcoat". not a homework question lol, im curious as to whats the simplest way to go about this. Step 2- Use sort () method to sort the list. Can YouTube (e.g.) Asking for help, clarification, or responding to other answers. 5 to 150), and also show its row and column index label in output.The largest values should be absolute. Not the answer you're looking for? How do you understand the kWh that the power company charges you for? OverflowAI: Where Community & AI Come Together. Can you have ChatGPT 4 "explain" how it generated an answer? Eliminative materialism eliminates itself - a familiar idea? How to find the 1st, 2nd, 3rd highest values in a list in Python Can YouTube (e.g.) You can try to understand the code and change it to take the two largest. This algorithm can be extended to deal with any number, If you already sort the list, you can just take the second last element. The first item of colors is at index -7. Then I can +1 this =D, @ManuLakaster That's because you don't have to do it at all. 4 Answers Sorted by: 4 You should change your function to take a list and return the two largest of it. Am I betraying my professors if I leave a research group because of change of interest? (Python), Pythonic way to get the largest item in a list. Time Complexity: O(NlogN) where N is the number of elements in the Array. rev2023.7.27.43548. Like so: This can be accomplished using max and min + enumerate: Thanks for contributing an answer to Stack Overflow! I want it to return [1, 5]. Can you add any explanation to your solution? I put return ind at the very last line right under i = i + 1 Bu that just gives me either [] or [0], i'm not getting all the rest of the values. I think i needed to explain more..Got confused in different approaches here ;(. Thanks for contributing an answer to Stack Overflow! Python program to find second largest number in a list Find centralized, trusted content and collaborate around the technologies you use most. Use Python's min () and max () to find smallest and largest values in your data Call min () and max () with a single iterable or with any number of regular arguments Use min () and max () with strings and dictionaries Tweak the behavior of min () and max () with the key and default arguments By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Can someone help me? As I said in another comment, in your first implementation if the list is, @ChatterOne The one where all I done was split up OPs code? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is it normal for relative humidity to increase when the attic fan turns on? How do I split a list into equally-sized chunks? This is because the numpy.argsort() function has a time complexity of O(nlogn) for sorting the input list, and selecting the second largest element from the sorted list takes constant time. Getting max value from dictionary and corresponding values, How to return the key with the largest value in a dictionary. Making statements based on opinion; back them up with references or personal experience. Asking for help, clarification, or responding to other answers. Good luck! Has these Umbrian words been really found written in Umbrian epichoric alphabet? To do this you can just yield the values, rather than numList.append them. How does this compare to other highly-active people in recorded history? is there a limit of speed cops can go on a high speed pursuit? I have a tester that runs through cases of my function. To learn more, see our tips on writing great answers. Basically you divide the array into two parts, then return the two largest numbers from the two parts. python loop to find the largest integer from a list, The largest Integer from n integers in python, For loops vs Max function for finding the largest number in a list in Python (Beginner), find second largest number from list using for loop with python. Did active frontiersmen really eat 20,000 calories a day? I'm quite new to it. i changed my code and used the pop() function which i liked better. :P. While the O(n lg n) bound on time complexity is correct, the space complexity is at worst O(n), and for many algorithms is O(1). I want to find the largest values from all the columns for repetitive row elements (i.e. However it can further be simplified by making it a generator function. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Not the answer you're looking for? How does this compare to other highly-active people in recorded history? Once the list of integers is sorted it is really easy to pick out the largest and second largest integers. Iterate through (key, value) pairs in the dictionary, and if value is the same as highest, then add key to a list. The best answers are voted up and rise to the top, Not the answer you're looking for? . Connect and share knowledge within a single location that is structured and easy to search. MathJax reference. Why is an arrow pointing through a glass of water only flipped vertically but not horizontally? Asking for help, clarification, or responding to other answers. rev2023.7.27.43548. You can also print the values inside the function instead of returning those, if printing is the only objective. 594), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Preview of Search and Question-Asking Powered by GenAI, How to print all the highest value places. This removes the need for num = 'holder', and can reduce the amount of lines needed. Thanks for contributing an answer to Stack Overflow! You can use the built-in functions max and min to find the maximum and minimum values respectively and then use the list method index to find their indices in the list. Find centralized, trusted content and collaborate around the technologies you use most. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Thanks. What is Mathematica's equivalent to Maple's collect with distributed option? Why do code answers tend to be given in Python when no language is specified in the prompt? That is exactly what I needed! Answers with explanations are more helpful than those without. What is the use of explicitly specifying if a function is recursive or not? How and why does electrometer measures the potential differences? Check PEP8. How do you understand the kWh that the power company charges you for? I am new to Python. You should also move the printing out of the function too, and instead return a list of the two largest. If you only want the 2nd largest element in the list (in cases where the highest value may occur twice), just skip the set() and list() call. Just interesting). N Channel MOSFET reverse voltage protection proposal. After I stop NetworkManager and restart it, I still don't connect to wi-fi? Please explain your reasoning (how your solution works and how it improves upon the original) so that the author can learn from your thought process. 1) int() returns 0, so if you have a list of negative numbers then your code would print 0 instead of the largest number. First find largest number in the list and stored the value in to max, Next loop the same list check the value are not equal to max and find largest number so you get second largest number, New! Could the Lightning's overwing fuel tanks be safely jettisoned in flight? Python dataframes - Finding the highest value from 2 or more different rows, Python Pandas - Highest values from multiple columns of duplicated entries, Get the columns name of the two largest values from pandas dataframe rows. Making statements based on opinion; back them up with references or personal experience. Did active frontiersmen really eat 20,000 calories a day? Connect and share knowledge within a single location that is structured and easy to search. Is there any way not to print the brackets? Time Complexity: O(nlogn)Auxiliary Space: O(1), Method 3: By removing the max element from the list, Time Complexity: O(n)Auxiliary Space: O(1), Method 4: Find the max list element on inputs provided by the user. For What Kinds Of Problems is Quantile Regression Useful? First I set m to be the first two elements of alist. Relative pronoun -- Which word is the antecedent? The built-in max() function returns the highest list item, the sort() function sorts the items ascending, and the last item will be the largest. Are modern compilers passing parameters in registers instead of on the stack? rev2023.7.27.43548. Python- Finding the largest number in a list using forloop or while You can sort the list first, then get the minimum and maximum values. Think about the two elements of the list that have the maximum distance between them. In the first example, you use a negative value for start. Single Predicate Check Constraint Gives Constant Scan but Two Predicate Constraint does not. So I have to find the second largest number from list. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Basically, things like append, max, etc. "Sibi quisque nunc nominet eos quibus scit et vinum male credi et sermonem bene". What does Harry Dean Stanton mean by "Old pond; Frog jumps in; Splash!". For What Kinds Of Problems is Quantile Regression Useful? do you want someone to do your homework? From the error, it seems the arguments are being passed as a tuple and not list. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing.
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