numbers

问题 This question already has an answer here : Generate Unique Random Matlab Numbers with a range (1 answer) Closed 5 years ago . I need to create several random sequences containing all digits from 0 through 9. The sequence needs to be random with no repetition and needs to include 0 and 9. I need to do this using MATLAB. Help please! 回答1: Use randperm to do this for you. You specify an input number N (like 10 in your example), and it returns a vector of size N of randomly placed elements from 1

问题 Im not sure what this type of number is '1.3122278540256E+18' but how can i expand it into an integer? Thanks!! 回答1: That's a floating-point number expressed in scientific notation (the "E+18" means "times 10 to the 18th power"). Chances are it's being displayed that way due to its length; you might try using printf to format it as a standard integer. 回答2: It is in IEEE floating point notation. It is a number too large to be calcuated exactly, but move the decimal +18 places to the right to

问题 i am making a cricket stats page and in 1 over there are 6 balls, however if i put in 0.7 id dose not make it 1.1, how can i use php to make it do this? This is all the code i have got (im using mysql): <?php echo $row['o'] ?> 回答1: $x = 0.7; $overs = floor(($x * 10) / 6); $balls = ($x * 10) - ($overs * 6); echo $overs.'.'.$balls; But you might want to use an integer input (the number of balls bowled) rather than a decimal value. $x = 7; $overs = floor($x / 6); $balls = $x - ($overs * 6); echo

问题 I'm fairly new to programming and I've been working on a project that finds four random divs and adds a class to them -- my only problem is that because my random generator has been generating the same number frequently, the program usually does not append the class to FOUR random divs but most likely three or even two. So my question is, how, if possible would I set my program to only generate four DIFFERENT numbers. I've heard of the Fisher Yates attempt, but I did not get it fully. Here is

问题 I am using the code below to ask users to rank (prioritize) which sweets they like the best. The users need to rank from 1-3 (1 being the best) <form id="form1" name="form1" method="post" action=""> <input type="number" name="cake" id="cake" required="required" max="3" min="1"/>Cake <br /> <input type="number" name="twizlers" id="twizlers"required="required" max="3" min="1"/>Twizlers <br /> <input type="number" name="taffy" id="taffy" required="required" max="3" min="1"/>Taffy <br /><br />

问题 For some reason I keep getting 6 every time. I know of another way to do a random dice roll, but I wanted to learn how to use the deafult_random_engine . #include <iostream> #include <string> #include <random> #include <ctime> using namespace std; int main() { default_random_engine randomGenerator(time(0)); uniform_int_distribution<int> diceRoll(1, 6); cout << "You rolled a " << diceRoll(randomGenerator) << endl; } But this bit of code works with the time(0) . #include <iostream> #include

问题 I am working on this python code for my first programming class. Yesterday it partially worked but then I changed something and now it is only passing 1 test case. The goal is to multiply all even numbers in list "xs" and return 1 if there are no even numbers. What am I doing wrong and how can I fix it? def evens_product(xs): product = 2 for i in xs: if i%2 == 0: product *= i return product else: return (1) Edit: Chepner's solution worked thank you to everyone who helped 回答1: You need to

问题 I want to display the income of a person in a certain time. For this I ask for the income per month (=gehalt) and working hours per week (stunden) in another activity. Then in the second activity I want to increase the TextView showGehaltproSekunde (id = textViewZahl) every second by the income per second. I am a beginner, so I don't know what exactly I have to write in public void run(). Or is there another possibility to increase the number every second? I hope someone can help me. Thank

问题 Hey guys I have string "69 - 13" How to detect "-" in the string and how to sum the numbers in the string 69+13=82 ? 回答1: There are various method to do that ( componentsSeparatedByString , NSScanner , ...). Here is one using only Swift library functions: let str = "69 - 13" // split string into components: let comps = split(str, { $0 == "-" || $0 == " " }, maxSplit: Int.max, allowEmptySlices: false) // convert strings to numbers (use zero if the conversion fails): let nums = map(comps) { $0

问题 For my program I am trying to figure how I can go about taking a series of number as string entered by the user; extract each number at spaces and parse them into integers. P.S I am still a newbie to the programming languages so please explain in a way that I can understand, thanks. This is what I have so far: A user may input a series of number like this: 15 31 94 87 108 11 7 63 79 public int [] getNumbers (){ Scanner reader = new Scanner (System.in); String inputStr = reader.nextLine(); int