numeric

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . I'm receiving json data that is aggregated by numerical indexes. When I'm in my forloop, for example, the index might start at 1, which means in my forloop an error would occur because 0 doesnt exist. How do I

问题 I am looking for an extended precision floating point library with the following features: fixed data type size (i.e. the extended precision float takes a fixed amount of memory) no initialization required for variables specify size of both mantissa and exponent C/C++ interface support for really large floats > 10^10000 The closest I could found is the HPA library by Ivano Primi. The only problem with this library is that I cannot extend the exponent (it is fixed with 15 bits). It allows me

问题 I have some strings like this string phoneNumber = "(914) 395-1430"; I would like to strip out the parethenses and the dash, in other word just keep the numeric values. So the output could look like this 9143951430 How do I get the desired output ? 回答1: You do any of the following: Use regular expressions. You can use a regular expression with either A negative character class that defines the characters that are what you don't want (those characters other than decimal digits): private static

问题 I try to implement some number type and I hit the issue that mynum * 1 works, but not 1 * mynum I tried to define an implicit conversion like this case class Num(v: Int) { def * (o: Int) = new Num(v*o) } implicit def int2Num(v: Int) = Num(v) but it doesn't seem work, because I always get the following error: scala> 1 * new Num(2) <console>:14: error: overloaded method value * with alternatives: (x: Double)Double <and> (x: Float)Float <and> (x: Long)Long <and> (x: Int)Int <and> (x: Char)Int

问题 I have an error being thrown by SQL Server Management Studio when running this code: declare @percentage numeric(3,2) set @percentage = cast(15 as numeric(3,2)) but when I change numeric declaration to declare @percentage numeric(4,2) set @percentage = cast(15 as numeric(4,2)) everything goes fine. Is there a limitation for numeric data type? 回答1: Numeric defines the TOTAL number of digits, and then the number after the decimal. A numeric(3,2) can only hold up to 9.99. 回答2: Lets see, numeric

问题 Recently I was going through an old blog post by Eric Lippert in which, while writing about associativity he mentions that in C#, (a + b) + c is not equivalent to a + (b + c) for certain values of a, b, c. I am not able to figure out for what types and range of arithmetic values might that hold true and why. 回答1: On the range of the double type: double dbl1 = (double.MinValue + double.MaxValue) + double.MaxValue; double dbl2 = double.MinValue + (double.MaxValue + double.MaxValue); The first

问题 I am trying to locate some problematic records in a very large Oracle table. The column should contain all numeric data even though it is a varchar2 column. I need to find the records which don't contain numeric data (The to_number(col_name) function throws an error when I try to call it on this column). 回答1: I was thinking you could use a regexp_like condition and use the regular expression to find any non-numerics. I hope this might help?! SELECT * FROM table_with_column_to_search WHERE

问题 Is there a better way than this to check if a DataColumn in a DataTable is numeric (coming from a SQL Server database)? Database db = DatabaseFactory.CreateDatabase(); DbCommand cmd = db.GetStoredProcCommand("Get_Some_Data"); DataSet ds = db.ExecuteDataSet(cmd); foreach (DataTable tbl in ds.Tables) { foreach (DataColumn col in tbl.Columns) { if (col.DataType == typeof(System.Single) || col.DataType == typeof(System.Double) || col.DataType == typeof(System.Decimal) || col.DataType == typeof

问题 I have a Python function with 64 variables, and I tried to optimise it using L-BFGS-B method in the minimise function, however this method have quite a strong dependence on the initial guess, and failed to find the global minimum. But I liked its ability to set bounds for the variables. Is there a way/function to find the global minimum while having boundaries for the variables ? 回答1: This can be done with scipy.optimize.basinhopping . Basinhopping is a function designed to find the global

问题 I have a Python function with 64 variables, and I tried to optimise it using L-BFGS-B method in the minimise function, however this method have quite a strong dependence on the initial guess, and failed to find the global minimum. But I liked its ability to set bounds for the variables. Is there a way/function to find the global minimum while having boundaries for the variables ? 回答1: This can be done with scipy.optimize.basinhopping . Basinhopping is a function designed to find the global