decimal

问题 I have a string like: $str1 = "12 ounces"; $str2 = "1.5 ounces chopped; I'd like to get the amount from the string whether it is a decimal or not (12 or 1.5), and then grab the immediately preceding measurement (ounces). I was able to use a pretty rudimentary regex to grab the measurement, but getting the decimal/integer has been giving me problems. Thanks for your help! 回答1: If you just want to grab the data, you can just use a loose regex: ([\d.]+)\s+(\S+) ([\d.]+) : [\d.]+ will match a

问题 I'm trying to implement a bigdecimal in Idris. I have this so far: -- a big decimal has a numerator and a 10^x value -- it has one type for zero, --TODO the numerator can't be zero for any other case --TODO and it can't be divisible by 10 data BigDecimal : (num : Integer) -> (denExp : Integer) -> Type where Zero : BigDecimal 0 0 BD : (n : Integer) -> (d : Integer) -> BigDecimal n d I would like to force the restrictions marked by "TODO" above. However, I'm am just learning Idris, so I'm not

问题 i've set up an attribute in my entity like this : /** * @var decimal * * @ORM\Column(name="latitude", type="decimal", precision=10, scale=7, nullable=true) */ private $latitude; but when i generate the database schema with : doctrine:database:create; doctrine:schema:create my field is set up to decimal (10,0) in the database (when i look up with phpmyadmin) and so, when in insert data like 42.123456 with a form, this data is truncated to 42 . how can i resolve this? Thanks. 回答1: Ok, finally

问题 I'm currently using the following to compute the difference in two times. The out - in is very fast and thus I do not need to display the hour and minutes which are just 0.00 anyway. How do I actually shift the decimal place in Python? def time_deltas(infile): entries = (line.split() for line in open(INFILE, "r")) ts = {} for e in entries: if " ".join(e[2:5]) == "OuchMsg out: [O]": ts[e[8]] = e[0] elif " ".join(e[2:5]) == "OuchMsg in: [A]": in_ts, ref_id = e[0], e[7] out_ts = ts.pop(ref_id,

问题 I'm currently using the following to compute the difference in two times. The out - in is very fast and thus I do not need to display the hour and minutes which are just 0.00 anyway. How do I actually shift the decimal place in Python? def time_deltas(infile): entries = (line.split() for line in open(INFILE, "r")) ts = {} for e in entries: if " ".join(e[2:5]) == "OuchMsg out: [O]": ts[e[8]] = e[0] elif " ".join(e[2:5]) == "OuchMsg in: [A]": in_ts, ref_id = e[0], e[7] out_ts = ts.pop(ref_id,

问题 I need to generate a dataframe or data.table which has different number of decimal places per column. For example: Scale Status 1.874521 1 Needs to be print in a CSV as: Scale, Status 1.874521, 1.000 This has to be as a numeric value as I have tried format(DF$status, digits=3) and as.numeric(format(DF$status, digits=3)) however this converts it to characters which when exported to CSV has double quotes ". My actual dataframe has lots of columns with different amounts of decimal places

问题 I have simple query from a view in SQL Server: SELECT [PricePerM] FROM RealtyStatParent ORDER BY PricePerM When I execute the query in SQL Management Studio I get correct results. It means I get 2532 rows starting from 1.00 and ending by 173543.6893. When I make a query from C# using entity framework, I got the same results: var justDecimals = context.RealtyStatParents .OrderBy(item => item.PricePerM) .Select(item => item.PricePerM) .ToArray(); Until now nothing special. But what I really don

问题 I am trying to get user input, parse it and then display with String.Format(), formatting thousands with comas. So, if user provides 1000 I will display 1,000 1000.00 => 1,000.00 1000.0 => 1,000.0 1,000.5 => 1,000.5 Basically I want to keep all decimals(including trailing zeroes) that were provided and just add formatting for thousands. I tried: String.Format("{0:#,0.######}" , Decimal.Parse(input)); String.Format("{0:#,0.######}" , Double.Parse(input); 回答1: double.Parse(input) is a no go, as

问题 I found a workaround for this error, but am now really curious as to why this would be happening, was wondering if anyone else has had this error. My function is as follows: public void Blog_GetRating(int blogID, ref decimal rating, ref int voteCount) { // Sql statements // Sql commands if (DataReader.Read()) { // this line throws a 'Input string was not in a correct format.' error. rating = decimal.Parse(DataReader["Rating"].ToString()); // this works absolutly fine?! decimal _rating = 0;

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Why is floating point arithmetic in C# imprecise? Hi. I've got following problem: 43.65+61.11=104.75999999999999 for decimal is correct: (decimal)43.65+(decimal)61.11=104.76 Why result for double is wrong? 回答1: This question and its answers are a wealth of info on this - Difference between decimal, float and double in .NET? To quote: For values which are "naturally exact decimals" it's good to use decimal. This