To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Making statements based on opinion; back them up with references or personal experience. Or something like 'standard library calls'? What is the most accurate way to map 6-bit VGA palette to 8-bit? The function should return True, since all the elements of array evaluate to True. Find centralized, trusted content and collaborate around the technologies you use most. 1 Before the loop, add table_true = 1;, but to be more efficient instead of a conditional you could have table_true &= bool_table [i] in the loop. Below is a C# solution to your problem (it should be rather efficient performance-wise): bool _allPositive indicates the result (you can use string var if you prefer). Syntax: I have a function repsEqual that takes an array and integer and returns 1 if the array contains only digits of the number in the same order that appear in the same number. 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. How to evaluate an array of varying length in a boolean expressions in C? Given no constraints on the vector, you have to iterate through the vector at least once, no matter the approach. If Phileas Fogg had a clock that showed the exact date and time, why didn't he realize that he had arrived a day early? (A while loop could be used but I sticked with a for loop for readability reasons). Not really, other than picking another container, e.g. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If the values in the vector are something different than basic type you have to implement equality operator. Enhance the article with your expertise. [] (Unicode) C U+0043 c U+0063. C++ Program to Count of Array elements greater than all elements on its left and at least K elements on its right 4. Cold water swimming - go in quickly? Please quote me correctly. It has a none member and several other std::bitset-like operations, but its length can be set at runtime. Connect and share knowledge within a single location that is structured and easy to search. To learn more, see our tips on writing great answers. Best-case, you reinterpret the memory differently and check more than 1 element at a time, but you still have to check everything until you find one that fails your test. Looking for story about robots replacing actors. How to optimize checking elements in a vector in c++, Quickly find all elements not in a vector c++, Most efficient way of evaluating a bool of all items in a vector of , then returning true if all are true. To win the game all pictures rotation.z value must be 0. For non-C++11, I would check out either. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. 4 Are you sure exactly the same elements doesn't mean they are in same order too? How can kaiju exist in nature and not significantly alter civilization? The simplest is to add an extra flag and negate the checking condition. 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Is not listing papers published in predatory journals considered dishonest? Connect and share knowledge within a single location that is structured and easy to search. 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Using a constant element (the first, typically) to compare all other elements against allow the compiler to hoist the load of it outside the loop. Empirically, what are the implementation-complexity and performance implications of "unboxed" primitives? Thank you. Why does CNN's gravity hole in the Indian Ocean dip the sea level instead of raising it? If any pictures rotation.z is not 0, you have not won. I want to generalize my answer a bit more: This can be done with any N mutually exclusive predicates A1, , AN that I want to check for my collection. Anthology TV series, episodes include people forced to dance, waking up from a virtual reality and an acidic rain. Why is this Etruscan letter sometimes transliterated as "ch"? If you steal opponent's Ring-bearer until end of turn, does it stop being Ring-bearer even at end of turn? How do I compare elements of vectors in C++? Non-compact manifolds with finite volume and conformal transformation, My bechamel takes over an hour to thicken, what am I doing wrong. C++ how to check if elements in an array are equal? How to declare and initialize an array in C++? About 100x speedup. Why is a dedicated compresser more efficient than using bleed air to pressurize the cabin? - Wikipedia Check if all values in array are true, then return a true boolean It is not, I did not have the time to elaborate my answer yet. To win the game all pictures rotation.z value must be 0. Checking if all elements of a vector are equal in C++, Test if all elements of a vector are equal. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, @ChristianRau: people are funny like that, they see a weakly typed language like C++ and go nuts. Connect and share knowledge within a single location that is structured and easy to search. Fastest way to find out if all elements in a vector are false or true c++? yup. But this is ugly way. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How can i check all items if their rotation.z value equals to 0? Is saying "dot com" a valid clue for Codenames? Find centralized, trusted content and collaborate around the technologies you use most. Here's my somewhat unconventional approach: Thanks for contributing an answer to Stack Overflow! Do I have a misconception about probability? You have several options to perform this task. Does that not count as much better? Simply turn the dial to the heat setting you desire and enjoy comforting warmth. C++: Fastest method to check if all array elements are equal Airline refuses to issue proper receipt. 3) Checks if unary predicate p returns true for at least one element in the range [first, last). So just pick the first element and check that all others are equal to it. Why does ksh93 not support %T format specifier of its built-in printf in AIX? I don't see how this is any 'simpler' than all the other ways posted 4 years earlier. For example: "Tigers (plural) are a wild animal (singular)". Conclusions from title-drafting and question-content assistance experiments Can I check a small array of bools in one go? Anthology TV series, episodes include people forced to dance, waking up from a virtual reality and an acidic rain. Contribute to the GeeksforGeeks community and help create better learning resources for all. But I'm missing the final check against 'n' as nmtuan has above so his answer is preferable to mine anyway. Using structured references with Excel tables - Microsoft Support To learn more, see our tips on writing great answers. How to insert an item into an array at a specific index? To provide the best experiences, we and our partners use technologies like cookies to store and/or access device information. "Is this region of memory all-zero?" 1. foreach is not working well. Thanks. It's not a good idea to override std::vector . Contribute your expertise and make a difference in the GeeksforGeeks portal. Determines whether all elements of a sequence satisfy a condition. Examples: Time Complexity: O(n) where n is the size of the vector. It traverses vector just once and does not mess with the vector content. After taking into account underscore_d remarks, I'm changing possible solution, In your specific case, iterating over vector element and finding a different element from the first one would be enough. @LoveMeow Which syntax? Importing a text file of values and converting it to table, Best estimator of the mean of a normal distribution based only on box-plot statistics. The technical storage or access that is used exclusively for statistical purposes. This is because the latest compiler for vs2015 uses sse instructions in c++ std implementations when you use ints, float , etc.. if you use _mm_testc_si128 you will get a similar performance to std::equal. C. - Wikipedia 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. In the above code, -6 being a negative element negates the condition and returns false. Like instead of checking each element using a loop? Inverting a matrix using the Matrix logarithm, Anthology TV series, episodes include people forced to dance, waking up from a virtual reality and an acidic rain. Airline refuses to issue proper receipt. For that you only need to find the first element that differs from the first, starting the search from the second. Jason Aldean's 'Try That in a Small Town' controversy, explained - NPR That would penalize far more useful operations. Not the answer you're looking for? What its like to be on the Python Steering Council (Ep. How to store Data Triplet in a Vector in C++? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You may even be lucky enough to stop before evaluating all the elements in your vector. To create the table, select any cell within the data range, and press Ctrl+T. Citation? Can I check in C (++) if an array is all 0 (or false) without iterating/looping over every single value and without allocating a new array of the same size (to use memcmp )? This seems to be some homework, haha. What its like to be on the Python Steering Council (Ep. Checking element values in a Boolean array - C#. "/\v[\w]+" cannot match every word in Vim. I know that I for one at least would rather end it all than die slowly in such an awful manner. Connect and share knowledge within a single location that is structured and easy to search. Let's implement it with a help of Linq All: If you wan to loop you can invert logic - YouWin == true if we don't have counter example (item.rotation.z != 0). Thank you for your valuable feedback! Can I check in C(++) if an array is all 0 (or false) without iterating/looping over every single value and without allocating a new array of the same size (to use memcmp)? rev2023.7.24.43543. Furthermore, the test can be done in parallel (and with assembly intrinsic if necessary). Is saying "dot com" a valid clue for Codenames? std::all_of() in C++ - GeeksforGeeks 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. User input should be put outside somewhere else, after you have the inputs (the array, the len, and n) you then pass-in to repsEqual for checking. 67 . Why do capacitors have less energy density than batteries? Check array value inside for loop. Furthermore I've made an error: the, @KevinWells If you take a look at comment time, you will see I posted the comment first, and if you take a look at that answer edit, you will see the first edit of answer was using dead.All(). How to check if all the elements in an array are positive integers? How feasible is a manned flight to Apophis in 2029 using Artemis or Starship? Or for a group of developers that eat and sleep C and use pointers regularly? I just generally comment on the later answer when I see two of the same answer. How to check if all the elements in an array are positive integers? Non-compact manifolds with finite volume and conformal transformation, Looking for story about robots replacing actors, English abbreviation : they're or they're not. Check if all elements in array are True In this example, we will take a Numpy Array with all its elements as True. Can somebody be charged for having another person physically assault someone for them? What you can do is use algorithms in C++ but that still involves a loop internally. Does "best" mean fastest? @Luchian Grigore yes , but it's shorter to write :), True, but "So what is the most efficient way of doing this and why?". What are the pitfalls of indirect implicit casting? Is it appropriate to try to contact the referee of a paper after it has been accepted and published? A Lambda function, which accepts an element as an argument and returns true if the given element is true. (A modification to) Jon Prez Laraudogoitas "Beautiful Supertask" What assumptions of Noether's theorem fail? Not the answer you're looking for? If there is a single element that is not true in the array, then the std::all_of() function returns false. Make sure the My table has headers box is checked, and click OK. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 592), How the Python team is adapting the language for an AI future (Ep. If it's not sorted, no. EDIT: How to determine if a JavaScript array contains an object with an or slowly? From what I understand, you can rewrite your code like this, without using an array: Thanks for contributing an answer to Stack Overflow! Asking for help, clarification, or responding to other answers. This function operates on whole range of array elements and can save time to run a loop to check each elements one by one. If all is true, all elements in the vector were true. Thanks for contributing an answer to Stack Overflow! Check if all elements in an array are true - Blueprint - Epic Developer Essentially, the same syntax can apply to Java-like languages, including scripting. Check the result every few hundred iterations for early exit. Fastest way to find out if all elements in a vector are false or true c++? How to check if all the values of an array are equal to 0? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Given that the OP expressed this as "all values are positive" I think it's clearer to use. Should I trigger a chargeback? To check if all elements of array are true, we are going to use the STL algorithm std::all_of(). Departing colleague attacked me in farewell email, what can I do? It is strange that nobody mentioned std::all_of.:). Eg, accessing data on my hd is O(n). Note that this is not attempting to solve the generic problem of removing duplicates or finding how many unique values there are, but rather finding whether there is at least one non-duplicate value. Otherwise it returns 0. Does glide ratio improve with increase in scale? This sort of hardware-accelerated comparison is a common solution when dealing with large bit-buffers. @Noah - we benchmarked that and discarded it at one point because it was horribly slow - reinventing the wheel is sometimes OK if usage is limited and performance is important. We'll it's basically an O(n) operation so you can't do much better than what you have, other than dispensing with the flag and just return false; on the first failure and return true; after the iteration. To learn more, see our tips on writing great answers. C. or c. may refer to: Century, sometimes abbreviated as c. or C., a period of 100 years; Cent (currency), abbreviated c. or , a monetary unit that equals 1 100 of the basic unit of many currencies Caius or Gaius, abbreviated as C., a common Latin praenomen; Circa, abbreviated as c. (or ca., circ., cca, and cc.) Does glide ratio improve with increase in scale? If you are sure, then it's pretty good solution. 592), How the Python team is adapting the language for an AI future (Ep. Looking for story about robots replacing actors. You can test it against an 8-element zero array, an 4-element zero array, a 2-element zero array and a 1-element zero array. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Check if condition for all elements inside an array is true, What its like to be on the Python Steering Council (Ep. If for all the elements the lambda function returns true, then the std::all_of() function will return true. If I were programming in some other language like R one way my minds jumps to is to return only the unique elements of the container and then if the length of the unique elements is more than 1, I know all the elements cannot be the same. By modulus 10 on your n you get the remainder of dividing by 10. I imagine mine is not the best way since it involves sorting every element and then a resizing of the vector - but maybe I'm wrong. In your case, check if an array and an integer have the same pattern Anyway I gave u a quick/ugly sample to start with. Eg, operate on 64bit ints, or use SSE or AVX intrinsics for 128 or 256 bit operation. Adjustable Thermostat - allows you to adjust the heater's 1500 watt ceramic heating element. In the circuit below, assume ideal op-amp, find Vout? Make sure to operate on aligned memory, check the unaligned start and end as ints, and check the first packed element with itself. Further improvement in term of memory allocation can be done with using only an 8-element array since a 4-element zero array is simply the first half of the 8-element zero array. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 592), How the Python team is adapting the language for an AI future (Ep. How to know if the the value of an array is composed by zeros? Lumache, or Shellbows, are perfect for scooping up the sauce and giving you the best flavor in each bite. What's the DC of a Devourer's "trap essence" attack? How to find indices in an std::vector which are true? Conclusions from title-drafting and question-content assistance experiments loop though a array then if and then output result? Some people would even assign, Well, in this case it would be off-topic for the actual question, wouldn't it? "for" also same result with foreach. In Objective-C Check an array of Boolean Values and see if at least ONE is YES, How to check ALL elements of a boolean array are true. Compared to other (already proposed) versions: Obviously, it still checks N elements and thus is O(N). Asking for help, clarification, or responding to other answers.
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