numeric

Encoding a numeric string into a shortened alphanumeric string, and back again

由 与世无争的帅哥 提交于 2019-12-09 17:17:51
问题 Quick question. I'm trying to find or write an encoder in Python to shorten a string of numbers by using upper and lower case letters. The numeric strings look something like this: 20120425161608678259146181504021022591461815040210220120425161608667 The length is always the same. My initial thought was to write some simple encoder to utilize upper and lower case letters and numbers to shorten this string into something that looks more like this: a26Dkd38JK That was completely arbitrary, just

Double precision (64-bit) representation of numeric value in R (sign, exponent, significand)

由 让人想犯罪 __ 提交于 2019-12-09 12:19:25
问题 R FAQ states that: The only numbers that can be represented exactly in R’s numeric type are integers and fractions whose denominator is a power of 2. All other numbers are internally rounded to (typically) 53 binary digits accuracy. R uses IEEE 754 double-precision floating-point numbers which is 1 bit for sign 11 bits for exponent 52 bits for mantissa (or significand) which sums up to 64-bits. For the numeric number 0.1 , R represents sprintf("%.60f", 0.1) [1] "0

3.days.ago, 2.hours.from_now etc without Rails?

由 北慕城南 提交于 2019-12-09 07:36:22
问题 Some book mentioned some gem to decorate numbers with #days , #megabytes , #minutes etc. Is this only in ActiveSupport, or is there a smaller gem that provides this functionality for use in (small) non-rails gems? I want to use this functionality as part of a DSL in a tiny little gem. 回答1: I'm not sure if there's another gem available besides ActiveSupport , but it would be really straight-forward to make a small version yourself: class Fixnum SECONDS_IN_DAY = 24 * 60 * 60 def days self *

React Native Input component takes ony numeric values

由 荒凉一梦 提交于 2019-12-08 18:24:26
问题 In React-Native project, I have an Input component from Native Base and I want to this component to take only numeric values 0-9 and give this field default value, I looked for other questions about this issue, I do not know maybe those answers are for 'textInput' component or somehow suggestions did not work for me? Can you help me please? 回答1: try use keyboardType="numeric" source 回答2: I grab your problem there is no attribute for Text Input to take numeric only. But I have two method for

Decimal.MinValue & Decimal.MaxValue: why static readonly and not const modifiers?

由 扶醉桌前 提交于 2019-12-08 17:45:21
问题 In C#, MinValue field is defined for numeric types with: ① static readonly modifiers for decimal type (Link to MSDN Libray for .NET 4.5): public static readonly decimal MinValue ② const modifier for all other numeric types: //Integral signed numeric types public const sbyte MinValue public const short MinValue public const int MinValue public const long MinValue //Integral unsigned numeric types public const byte MinValue public const ushort MinValue public const uint MinValue public const

Is DBL_MIN the smallest positive double?

由 冷暖自知 提交于 2019-12-08 16:53:27
问题 Q: Is DBL_MIN the smallest positive double? The code below seems to anwser this question with no. But if this is true, how is DBL_MIN the defined and what is its use or purpose. Platform: Windows7 & Visual Studio 2013 double next_to_zero = std::nextafter(0.0,DBL_MIN); bool b = DBL_MIN <= next_to_zero; std::cout << std::boolalpha << "is dbl_min the smallest representable double? " << b << '\n'; std::cout << std::setprecision(56) << "dbl_min = " << DBL_MIN << '\n' << "next to zero = " << next

Regain an original fractional numeric value that Excel has transformed to a date value

由 走远了吗. 提交于 2019-12-08 14:20:38
问题 I have an Excel workbook that contains numeric values and some of them have been transformed by Excel auto format feature into the date values. I do not know the original numeric values and neither do I have access to the .txt version of that file. Is there a way to calculate the value from the date? For example, what value was substituted by Excel to get: 08.01.2014 . This is not related to applying VALUE function to the date of changing cell format to "General." 回答1: EDIT#1: If the value

ANDROID - Numeric keyboard

由 喜欢而已 提交于 2019-12-08 12:43:32
Good afternoon. I have an EditText that may contain numbers and letters. By deploying the keyboard, is there any way to deploy it in numerical form?. If I put the EditText as numeric I do, but that's not my case. Thank you very much. Try this: EditText myEditText = (EditText)findViewById(R.id.myEditText); myEditText.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL); Then set it back to alphanumeric when you are done with numeric.. You can: Hide/Show different EditTexts that have different input types Dynamically set the input type of your EditText as needed (editText.setInputType(InputType.TYPE

SQL Index - Difference Between char and int

由 大兔子大兔子 提交于 2019-12-08 11:37:36
问题 I have a table on Sql Server 2005 database. The primary key field of the table is a code number. As a standard, the code must contain exactly 4 numeric digits. For example: 1234, 7834, ... Do you suggest that field type to be char(4) or int or numeric(4) in terms of effective select operation. Would indexing the table on any type of these differ from any other? 回答1: Integer / Identity columns are often used for primary keys in database tables for a number of reasons. Primary key columns must

working with numeric input field in js

由 三世轮回 提交于 2019-12-08 11:29:25
问题 i have a form in wich i have several input... one of them should be a number input type. i use this code to get only numeric input in a input type. <script type="text/javascript"> function isNumberKey(evt){ var charCode = (evt.which) ? evt.which : event.keyCode if ((charCode > 31) && (charCode < 48 || charCode > 57)) return false; return true; } </script> but i need another features that i still not able to "create"... i have an input type (example : ) and onkeyup event i call this function
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