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R: How to convert long number to string to save precision

由 别来无恙 提交于 2021-01-27 11:59:45
问题 I have a problem to convert a long number to a string in R. How to easily convert a number to string to preserve precision? A have a simple example below. a = -8664354335142704128 toString(a) [1] "-8664354335142704128" b = -8664354335142703762 toString(b) [1] "-8664354335142704128" a == b [1] TRUE I expected toString(a) == toString(b) , but I got different values. I suppose toString() converts the number to float or something like that before converting to string. Thank you for your help.

R: How to convert long number to string to save precision

由 三世轮回 提交于 2021-01-27 11:59:24
问题 I have a problem to convert a long number to a string in R. How to easily convert a number to string to preserve precision? A have a simple example below. a = -8664354335142704128 toString(a) [1] "-8664354335142704128" b = -8664354335142703762 toString(b) [1] "-8664354335142704128" a == b [1] TRUE I expected toString(a) == toString(b) , but I got different values. I suppose toString() converts the number to float or something like that before converting to string. Thank you for your help.

Linq to Entities中的Datetime类型转换

由 雨燕双飞 提交于 2021-01-13 08:53:50
使用JavaScriptSerializer将Ado.net Entity Framework的实体转换为JSON。不过JavaScriptSerializer在序列化Datetime类型的处理有些特别： DateTime time = new DateTime(0x7b2, 1, 1, 0, 0, 0, DateTimeKind.Utc); DateTime dt=(DateTime)obj ; return string.Format(" new Date({0}) ", (long) ((dt.ToUniversalTime().Ticks - time.Ticks) / 0x2710L)) 生成的是类似"\/Date(1271729248060)\/"的字符串，而不是通常的时间格式。虽然这种做法有关于全球化和减少ajax传输量的考虑，但是在大多数的本地化应用中，我们其实只需要传递通常的时间格式字符串就行了。 虽然在Linq to Entities里不支持ToString()等类型转换，但是我们可以使用AsEnumerable()先将Linq to Entities的结果转换为IEnumerable，再使用ToString()方法把时间字段转化成String。 var list = ctx.UserInfo.Select(u => new { u.Id, u.Guid, u

Integer.parseInt() and Integer.toString() runtime

由 你。 提交于 2021-01-05 07:45:10
问题 Would the runtime of Integer.parseInt(String i) and Integer.toString(int i) both be O(n)? 回答1: Yes both of them Integer.parseInt("1000") and Integer.toString(1000) have time complexity O(N) The internal code of Integer.parseInt("1000") reads the the strings char by char and covert to decimal in while loop The internal code of Integer.toString(1000) reads the integers and convert every digit to char and stores in byte[] buf then creates new string from the byte array Here is the code of

Using toString function in R

由 牧云@^-^@ 提交于 2021-01-03 19:18:55
问题 I have numeric objects a=1,b=2,c=3,d=4. Now when I use : toString(c(a,b,c,d)) I get: "1, 2, 3, 4" as the output. How do I get rid of the comma ? I want "1234" as the output. Or is there another way to do this? 回答1: Just use paste or paste0 : a <- 1; b <- 2; c <- 3; d <- 4 paste0(a, b, c, d) # [1] "1234" paste(a, b, c, d, sep="") # [1] "1234" You cannot get the result directly from toString even though toString uses paste under the hood: toString.default # function (x, width = NULL, ...) # { #

Using toString function in R

由 三世轮回 提交于 2021-01-03 19:00:30
问题 I have numeric objects a=1,b=2,c=3,d=4. Now when I use : toString(c(a,b,c,d)) I get: "1, 2, 3, 4" as the output. How do I get rid of the comma ? I want "1234" as the output. Or is there another way to do this? 回答1: Just use paste or paste0 : a <- 1; b <- 2; c <- 3; d <- 4 paste0(a, b, c, d) # [1] "1234" paste(a, b, c, d, sep="") # [1] "1234" You cannot get the result directly from toString even though toString uses paste under the hood: toString.default # function (x, width = NULL, ...) # { #

Using toString function in R

由 旧巷老猫 提交于 2021-01-03 18:55:02
问题 I have numeric objects a=1,b=2,c=3,d=4. Now when I use : toString(c(a,b,c,d)) I get: "1, 2, 3, 4" as the output. How do I get rid of the comma ? I want "1234" as the output. Or is there another way to do this? 回答1: Just use paste or paste0 : a <- 1; b <- 2; c <- 3; d <- 4 paste0(a, b, c, d) # [1] "1234" paste(a, b, c, d, sep="") # [1] "1234" You cannot get the result directly from toString even though toString uses paste under the hood: toString.default # function (x, width = NULL, ...) # { #

Visual Studio 2015 extension to generate a ToString() method in a class

由 柔情痞子 提交于 2020-12-16 09:13:43
问题 With extension I meant a Visual Studio Extension. I wan't to know if there's a way to autogenerate a ToString method with an already created extension. I want to have a class with some properties and use a tool to generate the ToString method using its properties. class A { String propA { get; set; } String propB { get; set; } // Autogenerated override ToString() { return "propA = " + propA + ", propB" + propB; } } If not, I wan't to know how can I make one. I searched the web but I can't

Are JavaScript template literals guaranteed to call toString()?

由 本小妞迷上赌 提交于 2020-11-24 18:14:16
问题 const num = 42 const str = `My number is ${num}` In this code what guarantee do I have about the conversion of num to a string ? Is it guaranteed to just call its toString() method or could the conversion be done in another way ? 回答1: Untagged templates use the ECMAScript ToString() abstract operation. The logic of template literal evaluation is spread over several sections which makes it difficult to follow, so I'll just post a link to it: https://tc39.es/ecma262/#sec-template-literals

Are JavaScript template literals guaranteed to call toString()?

由 房东的猫 提交于 2020-11-24 18:13:49
问题 const num = 42 const str = `My number is ${num}` In this code what guarantee do I have about the conversion of num to a string ? Is it guaranteed to just call its toString() method or could the conversion be done in another way ? 回答1: Untagged templates use the ECMAScript ToString() abstract operation. The logic of template literal evaluation is spread over several sections which makes it difficult to follow, so I'll just post a link to it: https://tc39.es/ecma262/#sec-template-literals
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