decimal

问题 I have an API developed with Django and Django Rest Framework. I've got a model with a DecimalField which should store values of at least one. Therefore, I've defined the field in the following way: goal = models.DecimalField(decimal_places=2, max_digits=16, validators=[MinValueValidator(1)]) When I create objects calling the API (using DRF's ModelViewSet), I can create objects with negative "goal", so the validator doesn't seem to work (I've got it included in the model serializer). Any idea

问题 I have this code in pyQt: calculation = day + night self.label.setText(repr(calculation * 30) and I can see result as: 3.7446232 but I would like to see as 3.74. Could you please point me to how to set decimal to 2. Should I use .format(round(calculation * 30) or for pyQt is different way to do this? Regards 回答1: You could do self.label.setText("%.2f", % (calculation * 30)) Documentation 来源： https://stackoverflow.com/questions/34814941/python-format-float-to-decimal-in-pyqt

问题 I am using RS232 serial communication to rotate the motor. The serial communication is done in strings but i need decimal value for it. Any clues how to proceed.I am coding in c language.i tried using atoi function but its not working. char *p; int z=atoi(p); 回答1: Usually given a string: char * myStr= "123"; the way to obtain it's value as an int is: int value=atoi(myStr); Some things important to notice: the following include is necessary: #include <stdlib.h> and you must be sure that your

问题 I can see alot of topics already, but none solved my problem. I'm from Slovenia. I'm using English version of Access 2007. Using c#. My locale settings are all set to Slovenian. I have a access database with decimal column. When I try to save 5,4 into it, it ignores , and stores 54 . If i try to store 5.4 into it, it also ignores . and stores 54 . I'm using datatables to manipulate data in code. public static DataSet DbData; public static DataRow DbRow; I have tried following solutions, none

问题 Is there a way to handle a list of doubles I can handle ints with the code below but not sure how to handle array of doubles. { CalculateSumOfList.ServiceReference1.Service1SoapClient client = new CalculateSumOfList.ServiceReference1.Service1SoapClient(); CalculateSumOfList.ServiceReference1.ArrayOfInt arrayOfInt = new CalculateSumOfList.ServiceReference1.ArrayOfInt(); arrayOfInt.AddRange(listDouble); // error here! string result = client.CalculateSum(arrayOfInt); label1.Text = Convert

问题 How can I effectively obfuscate numbers from range 0.00 ~ 9999.99 like 11.68 6.84 7.99 7.00 so that small difference in values of similarily-sized numbers is not immediately visible? I thought about splitting each number into integer and decimal part and use them as coordinates (e.g. 11.68 → (11, 68) ) and converting them to polar coords, which is nice, but I still need two values to store them. Do you know some nice tranformation of decimal(6,2) into another single number (can be like float

问题 This question already has answers here : Converting Decimal to Binary Java (28 answers) Closed 5 years ago . How can i convert a decimal into binary? Is there any built in method which i can use to convert decimal into binary? 回答1: you can use this method Integer.toBinaryString() it's built-in in java 回答2: I assume you want the binary representation of an integer number. You could use Integer.toBinaryString(int) - System.out.println(Integer.toBinaryString(0)); System.out.println(Integer

问题 I want to turn a "dirty" figure into a properly written currency price. The input figure will be something like 23.99000 and I want to display 23,99 + the Euro symbol. I use this: $price = number_format($price, 2, ',', '')." €"; But the result will be 23,00 € instead of 23,99 €. What am I getting wrong? Thanks! 回答1: Try something like this: <?php $price = 23.99000; $price = sprintf("%01,2f", $price).' €'; echo $price; Output: 23,99 € the f means it'll treat the string as a float, and format

问题 I'm using Redis script by Lua to do some module related to money (http://redis.io/commands/eval). Unfortunately, Redis Lua does not support big decimal type. I searched through the internet and found some library for supporting decimal for lua like lmapm. But unfortunately, I don't know how to install to use it in Redis script. For a general question, how can I install third party library for Redis script (like https://github.com/amakawa/ohm.lua), because seem like Redis script does not

问题 This is a continuation of the question asked here: Exponential of large negative numbers. The reason I want to use decimal is that np.exp(-large_numbers) return 0.0. Using Eric's answer to this question: https://stackoverflow.com/a/7771210/6943476, I tried converting my np.array to decimal but I still get the data-type numpy.ndarray. Coding ability: Beginner My final goal is to have a function return a damped sinusoid: def waveform(mass_sm, amplitude, F, Q, phi, Time): w = F/mass_sm print