convert

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to get familiar with C# and tried out the following program - it just outputs the average of the even numbers in the Array. Would be great if someone could highlight the problem here. 回答1: You need select.Average() (with the parens). 回答2: The Missing Parenthesis () is the reason for your error.It should be Average() without a Parenthesis,it is understood as a method group.The average method could have multiple overloads and it is unclear which specific overloaded method needs to be invoked.But when you mention the parenthesis it

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Possible Duplicate: Parse DateTime with timezone of form PST/CEST/UTC/etc How to Convert PDT Time string to DateTime I want to convert this value 05:41:33 Apr 23, 2012 PDT to datetime . i am trying this but it is giving an error. DateTime dt = Convert.ToDateTime("05:41:33 Apr 23, 2012 PDT"); Please help me guys how we can do it in C#. Thanks,Rajbir 回答1: The PDT is not recognizable as a timezone by any of the parsing options for a DateTime in the BCL. If you convert it to -0700 before parse it will parse ok. string correctedTZ = "05:41:33 Apr

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Say I have the string 1,2,3,4,5 and I want to convert this to an array of integers - what would be the best way? I know I can use explode to create an array with the string but I need the array items to be integers. 回答1: You can use array_map to apply intval to each array item after you explode the string: $string = "1,2,3,4,5"; $int_array = array_map("intval", explode(",", $string)); 回答2: You could also type cast it. $string = "1,2,3,4,5"; $explode = explode(',', $string); foreach ($explode as $key) $arrIntegers[] = (int) $key; var_dump(

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm using a front-end of Lua which is unfortunately outdated, so I'm stuck with version 5.1 here, meaning the bit32 library is out of reach (which I probably could have used to convert this). So I'm wondering if anyone knows of a way I could implement either a floating-point to binary (digits) function or, better yet, floating-point to hex. The best I've been able to come up with so far is a decimal to binary/hex function... 回答1: lua-MessagePack . A big thank you goes to him. function float2hex (n) if n == 0.0 then return 0.0 end local sign

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a field value productlength of 0.123. This is from a view and has a data type of varchar. I need to convert it to a float or numeric value so as o perform math comparisons. convert(float,productlength) and cast(productlength as float) both do not work. error varchar cant be converted to float or somethiing liek that. From what I have read varchar can simply not be converted to a numeric string? Any clever ways around this? 回答1: You can convert varchars to floats, and you can do it in the manner you have expressed. Your varchar must

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Basically, given a quaterion (qx, qy, qz, qw)... How can i convert that to an OpenGL rotation matrix? I'm also interested in which matrix row is "Up", "Right", "Forward" etc... I have a camera rotation in quaternion that I need in vectors... 回答1: The following code is based on a quaternion (qw, qx, qy, qz), where the order is based on the Boost quaternions: boost::math::quaternion quaternion; float qw = quaternion.R_component_1(); float qx = quaternion.R_component_2(); float qy = quaternion.R_component_3(); float qz = quaternion.R_component

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: My Flex application records audio-only FLV files using red5--I'd like to convert these to SWF files so I can embed them in other SWF files. (I could also convert to MP3 and then embed them into SWFs myself, but I'd prefer a one step solution.) Anyone have experience doing this? What I've tried: The following naive ffmpeg command fails: > ffmpeg -i 3139747641.flv -vn movie.swf FFmpeg version SVN-r21751-snapshot, Copyright (c) 2000-2010 Fabrice Bellard, et al. built on Feb 11 2010 09:15:42 with gcc 4.2.1 (SUSE Linux) configuration: --enable

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is there a built in way to convert an IEnumerable<Task<T>> to an IObservable<T>. Order doesn't matter, just that I get things, though preferably as they're completed. If it doesn't exist yet, what might be a good way to accomplish it? 回答1: I believe this will work tasks.Select(t => Observable.FromAsync(() => t)) .Merge(); Each task will send its results to the observable sequence in whatever order they complete. You can subscribe to the sequence and do whatever you want with the results that way. 回答2: You could do it this way: var query =

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am attempting to pipe something to a subprocess using the following line: p.communicate("insert into egg values ('egg');"); TypeError: must be bytes or buffer, not str How can I convert the string to a buffer? 回答1: The correct answer is: p.communicate(b"insert into egg values ('egg');"); Note the leading b, telling you that it's a string of bytes, not a string of unicode characters. Also, if you are reading this from a file: value = open('thefile', 'rt').read() p.communicate(value); The change that to: value = open('thefile', 'rb').read()

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm loving the new JSON functions in MySQL 5.7, but running into a block trying to merge values from JSON into a normal table structure. Grabbing JSON, manipulating and extracting arrays from it etc. is simple. JSON_EXTRACT all the way. But what about the inverse, going from a JSON array to rows? Perhaps I am dense on the existing MySQL JSON functionality, but I haven't been able to figure that one out. For example, say I have a JSON array and want to insert a row for each element in the array with its value? The only way I have found is to