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The X angle between two 3D vectors?

由 北慕城南 提交于 2019-12-18 13:36:09
问题 I have two 3D vectors called A and B that both only have a 3D position. I know how to find the angle along the unit circle ranging from 0-360 degrees with the atan2 function by doing: EDIT: (my atan2 function made no sense, now it should find the "y-angle" between 2 vectors): toDegrees(atan2(A.x-B.x,A.z-B.z))+180 But that gives me the Y angle between the 2 vectors. I need to find the X angle between them. It has to do with using the x, y and z position values. Not the x and z only, because

Specifying arguments with spaces for running a python script

由 走远了吗. 提交于 2019-12-17 20:19:37
问题 How to run a python with arguments that would contain spaces? I am using MacOS For example, >python testProgram.py argument 1 argument 2 where "argument 1" is a single argument? 回答1: where "argument 1" is a single argument. You've basically answered your own question there, "argument 1" is indeed a single argument. In other words, you need to quote it, something like one of: python testProgram.py "argument 1" 'argument 2' This isn't actually a Python issue however, it depends on the shell

How to remove extra returns and spaces in a string by regex?

由 可紊 提交于 2019-12-17 19:14:34
问题 I convert a HTML code to plain text.But there are many extra returns and spaces.How to remove them? 回答1: I'm assuming that you want to find two or more consecutive spaces and replace them with a single space, and find two or more consecutive newlines and replace them with a single newline. If that's correct, then you could use resultString = Regex.Replace(subjectString, @"( |\r?\n)\1+", "$1"); This keeps the original "type" of whitespace intact and also preserves Windows line endings

How to include space in XML tag/element which gets transformed by XSLT into Excel sheet [duplicate]

由 我的梦境 提交于 2019-12-17 18:54:59
问题 This question already has answers here : Encoding space character in XML name (2 answers) Closed 2 years ago . I have an XML which gets transformed with an XSLT into an Excel sheet on a webpage. The element tags in XML becomes column headers in Excel. There are columns which would like to have spaces. We don't like underscores or hyphens coming in Excel sheet headers. How can I incorporate space in an XML tag/element? I tried putting or %20 or #&20; etc. (all kinds of syntax) but all of

Adding space between numbers?

由 夙愿已清 提交于 2019-12-17 15:46:44
问题 I'm trying to make a number input. I've made so my textbox only accepts numbers via this code: function isNumber(evt) { evt = (evt) ? evt : window.event; var charCode = (evt.which) ? evt.which : evt.keyCode; if (charCode > 31 && (charCode < 48 || charCode > 57)) { return false; } return true; } But now the question comes to, how would I create spaces as the user is typing in their number, much like the iPhone's telephone spacing thing, but with numbers so for example if they type in: 1000 it

How to check if text is “empty” (spaces, tabs, newlines) in Python?

由 佐手、 提交于 2019-12-17 03:53:21
问题 How can I test if the string is empty in Python? For example, "<space><space><space>" is empty, so is "<space><tab><space><newline><space>" , so is "<newline><newline><newline><tab><newline>" , etc. 回答1: yourString.isspace() "Return true if there are only whitespace characters in the string and there is at least one character, false otherwise." Combine that with a special case for handling the empty string. Alternatively, you could use strippedString = yourString.strip() And then check if

Regular expression to allow spaces between words

由 为君一笑 提交于 2019-12-17 03:22:57
问题 I want a regular expression that prevents symbols and only allows letters and numbers. The regex below works great, but it doesn't allow for spaces between words. ^[a-zA-Z0-9_]*$ For example, when using this regular expression "HelloWorld" is fine, but "Hello World" does not match. How can I tweak it to allow spaces? 回答1: tl;dr Just add a space in your character class. ^[a-zA-Z0-9_ ]*$ Now, if you want to be strict... The above isn't exactly correct. Due to the fact that * means zero or more

Prepros/XAMPP adding unwanted space under last div/footer

由 六月ゝ 毕业季﹏ 提交于 2019-12-14 04:04:31
问题 In spite of setting all margins and padding to 0, I'm suddenly finding that processing my html & css using Prepros (also tried with XAMPP), is adding extra (unwanted) space under my last item ie. footer. While running the same html & css directly from Notepad++, does not do this (thankfully). Can someone please explain why this is happening since I will eventually be running from a local host. Here is the HTML: <!DOCTYPE html> <html> <head> <meta charset="utf=8"> <title>Title</title> <meta

How do I put a space in between every four characters in this output?

由 此生再无相见时 提交于 2019-12-14 03:16:18
问题 I am writing a program where I have to display binary representations of various data types. I need the binary output to have a space after every four numbers. For instance: 0011 1111 1000 1110 1011 1000 0101 0010 Below is sample of a function I am using to display the binary code. What is the best way to format the output with the spaces? void printChar(char testChar) { unsigned char mask = pow(2, ((sizeof(char) * 8) - 1)); cout << "The binary representation of " << testChar << " is "; for

Image in Button: Strange space

由 偶尔善良 提交于 2019-12-13 07:52:11
问题 First the result in Firefox 4 Beta 8: Button vs Div http://b.imagehost.org/0419/buttonSpace.png The former element shown is a button with an img the latter is a div with an img . As you can see in the former case there is some strange space between the border of the img and the border of the button . I wonder how I can remove it. Here the CSS file: * { margin: 0; padding: 0; } button, img, div { border: 1px solid black; } img { display: block; } 回答1: Testing the above testcase in other
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