numbers

how to set the number format for an EditText

由 纵然是瞬间 提交于 2019-12-06 10:22:22
I want the number being displayed in my EditText upto 1 decimal place with no leading zeroes e.g. 25.0 not like 025.0 how can i do this? this is in android You can use DecimalFormat DecimalFormat format = new DecimalFormat("##.#"); String formattedText = format.format(025.0); editText.setText(formattedText); You will get result in EditText as 25.0 you can set it in xml file. Like <EditText android:id="@+id/editText1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/imageView1" android:layout_below="@+id/imageView1" android:layout

R语言 函数

由 ぐ巨炮叔叔 提交于 2019-12-06 10:00:51
R语言函数 函数是一组组合在一起以执行特定任务的语句。 R语言具有大量内置函数，用户可以创建自己的函数。 在R语言中，函数是一个对象，因此R语言解释器能够将控制传递给函数，以及函数完成动作所需的参数。 该函数依次执行其任务并将控制返回到解释器以及可以存储在其他对象中的任何结果。 函数定义 使用关键字函数创建R语言的函数。 R语言的函数定义的基本语法如下 function_name <- function(arg_1, arg_2, ...) { Function body } 函数组件 函数的不同部分 函数名称 -这是函数的实际名称。 它作为具有此名称的对象存储在R环境中。 参数 -参数是一个占位符。 当函数被调用时，你传递一个值到参数。 参数是可选的; 也就是说，一个函数可能不包含参数。 参数也可以有默认值。 函数体 -函数体包含定义函数的功能的语句集合。 返回值 -函数的返回值是要评估的函数体中的最后一个表达式。 R语言有许多内置函数，可以在程序中直接调用而无需先定义它们。我们还可以创建和使用我们自己的函数，称为用户定义的函数。 内置功能 内置函数的简单示例是seq()，mean()，max()，sum(x)和paste(...)等。它们由用户编写的程序直接调用。 您可以参考最广泛使用的R函数。 # Create a sequence of numbers from 32 to

Dealing with small numbers and accuracy

由 瘦欲@ 提交于 2019-12-06 08:57:49
I have a program where I deal with a lot of very small numbers (towards the lower end of the Double limits). During the execution of my application, some of these numbers progressively get smaller meaning their "estimation" is less accurate. My solution at the moment is scaling them up before I do any calculations and then scaling them back down again? ...but it's got me thinking, am I actually gaining any more "accuracy" by doing this? Thoughts? Are your numbers really in the region between 10^-308 (smallest normalized double) and 10^-324 (smallest representable double, denormalized i.e.

Java: how to output double-type number to integer format if its decimal is 0

由 守給你的承諾、 提交于 2019-12-06 07:53:32
问题 I have an array of double-type numbers {1.0, 2.3, 3.45, 7.8, 9.0, 5.0}. When outputting the numbers, I want to have those with decimal of 0 to show up like an integer: for example, 1.0 => 1, 9.0 => 9. In java, how do you do this easily? thanks 回答1: Not using any libraries I'd suggest: public static String parse(double num) { if((int) num == num) return Integer.toString((int) num); //for you, StackOverflowException return String.valueOf(num); //and for you, Christian Kuetbach } Casting a

PHP Random Number

由 荒凉一梦 提交于 2019-12-06 07:12:11
问题 I want to generate a random number in PHP where the digits itself should not repeat in that number. Is that possible? Can you paste sample code here? Ex: 674930, 145289. [i.e Same digit shouldn't come] Thanks 回答1: Here is a good way of doing it: $amountOfDigits = 6; $numbers = range(0,9); shuffle($numbers); for($i = 0;$i < $amountOfDigits;$i++) $digits .= $numbers[$i]; echo $digits; //prints 217356 If you wanted it in a neat function you could create something like this: function randomDigits

C/C++ Large number calculation

由 此生再无相见时 提交于 2019-12-06 06:58:26
问题 I'm trying to compute the following number in a C program : result = (3 * pow(2,500000000) - 2 ) % 1000000000 The power of 2 is way to large to be handled properly => I'm under the impression I could split the calculation in many steps using the modulo to reduce the result size. Does someone has a strategy for doing so ? Any other idea ? Thanx in advance Manu 回答1: The simplest method is exponentiation by repeated squaring reducing by the modulus in each step. unsigned long long mod_pow

regex to split number from string

由 浪子不回头ぞ 提交于 2019-12-06 06:47:11
问题 How to split and select which is number using regex. User can enter string like: 1dozen 3 dozen dozen1 <= unlikely but assume user will type that too 30/kg I still find out with the incomplete one: /[a-z](?=\d)|\d(?=[a-z])/i But missing space and forward slash. Can anyone help me? 回答1: The lookarounds are completely unnecessary here! See http://jsfiddle.net/5WJ9v/ The code: var text = "1dozen 3 dozen dozen1 30/kg"; var regex = /(\d+)/g; alert(text.match(regex)); You get a match object with

How to Add values in a table together using jQuery?

由 回眸只為那壹抹淺笑 提交于 2019-12-06 06:33:48
问题 I have an HTML table with number values. What I need to do is to get all these values and add them together using jQuery. Any ideas? Example table: http://pastie.org/998759 回答1: You can call .each : var sum = 0; $('table td').each(function() { sum += parseFloat($(this).text()); }); 回答2: I'm going to give you some pseudo-code of how I would do it (mainly because I can't be stuffed writing the whole thing). Create an object/array/variables to store the totals. jQuery select the table Use .each(

How can I distort the distribution of a set of random numbers?

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-12-06 06:27:42
I want to craft an algorithm that will give me numbers that are random in the sense that I have no idea what they'll be, but at the same time, numbers that are closer to 0 have to be more likely to occur as output while those closer to 1 must be less likely. I'd like to play around with both linear and exponential distributions, so please give at least hints for implementing both. I've thought and thought about how to approach this issue, but I still don't even have a clue, so any pointers would be appreciated. NOTE: I'm not looking to discuss, nor do I yet understand, the intricacies of "true

String to Number and back algorithm

由 杀马特。学长 韩版系。学妹 提交于 2019-12-06 06:19:57
问题 This is a hard one (for me) I hope people can help me. I have some text and I need to transfer it to a number, but it has to be unique just as the text is unique. For example: The word 'kitty' could produce 12432, but only the word kitty produces that number. The text could be anything and a proper number should be given. One problem the result integer must me a 32-bit unsigned integer, that means the largest possible number is 2147483647. I don't mind if there is a text length restriction,
订阅 numbers