dot

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 making a game in HTML5, Canvas, and this is my code for resolving collision between two moving circles: function resCCCol(a, b) { var dx = a.x - b.x; var dy = a.y - b.y; var dist = dx * dx + dy * dy; var vx = b.vx - a.vx; var vy = b.vy - a.vy; var dot = dx * vx + dy * vy; if (dot > 0) { var scale = dot / dist; var cx = dx * scale; var cy = dy * scale; var mass = a.r + b.r; var cw1 = 2 * b.r / mass; var cw2 = 2 * a.r / mass; a.vx += cw1 * cx a.vy += cw1 * cy b.vx -= cw2 * cx b.vy -= cw2 * cy } } If I set the coordinates so that the

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: In numpy, I have two "arrays", X is (m,n) and y is a vector (n,1) using X*y I am getting the error ValueError: operands could not be broadcast together with shapes (97,2) (2,1) When (97,2)x(2,1) is clearly a legal matrix operation and should give me a (97,1) vector EDIT: I have corrected this using X.dot(y) but the original question still remains. 回答1: dot is matrix multiplication, but * does something else. We have two arrays: X , shape (97,2) y , shape (2,1) With Numpy arrays, the operation X * y is done element-wise, but one or both of

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 dot file generated from my code and want to render it in my output. For this i have seen on the net that the command is something like this on cmd dot -Tpng InputFile.dot -o OutputFile.png for Graphviz But my problem is that I want to use this inbuilt in my python program. How can i do so ?? I looked at pydot but can't seem to find an answer in there..... 回答1: pydot needs the GraphViz binaries to be installed anyway, so if you've already generated your dot file you might as well just invoke dot directly yourself. For example: from

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 want that Scaladoc generates a type hierarchy diagram for the following code snippet: trait A trait B extends A But when I execute scaladoc .scala there is no type hierarchy shown - neither in A nor in B . How can I generate such diagrams? 回答1: First, one needs Scaladoc2 for this, which is part of Scala 2.10. If 2.10 is installed, one also needs to pass the -diagrams option to Scaladoc in order to generate the diagrams. But if you do so it can be that the following error message occurs: Graphviz dot encountered an error when generating the

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): 由 翻译 强力驱动 问题: If I'm using @synthesize foo; , what's the difference between the following: // message syntax [ myObj setFoo : 5 ]; [ myObj foo ]; and // dot syntax myObj . foo = 5 ; myObj . foo ; I like the consistency of the dot syntax but I don't know if it's doing something I should be I concerned about. Any additional information would be a great help. 回答1: There is no functional difference between using dot syntax and using message syntax. I find that using message syntax is more consistent with the language as a whole and that dot syntax

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 trying to use dot (.) in query string parameter but its not working. This URL is working fine: http://localhost:9000/search-result?majTFMin=0&majTFMax=100&majDOMCFMin=0&majDOMCFMax=100&majRefDomainsMin=0&majRefDomainsMax=100&majRefIPsMin=0&majRefIPsMax=100&majRefDomainsEDUMin=0&majRefDomainsEDUMax=100&majRefDomainsGOVMin=0&majRefDomainsGOVMax=100&selectedTLDs=com But not this one as it contains a dot in a parameter: http://localhost:9000/search-result?majTFMin=0&majTFMax=100&majDOMCFMin=0&majDOMCFMax=100&majRefDomainsMin=0

I am trying to create a dot file using JDD project . It requires installation of Graphviz. I tried to install it using console: sudo apt-get install graphviz In that case, although the installation seemed successful, the program did not produce me any output. Therefore I tried another approach by downloading the top most .deb file but I got the error: "Dependency is not satisfiable: libgraphviz4 (>=2.18)" Does anyone know how I can make it work? bitterman This worked for me on a 64-bit machine. Try adding these lines to your /etc/apt/sources.list file: deb http://security.ubuntu.com/ubuntu

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): 由 翻译 强力驱动 问题: I am using Python on Mac OSX Leopard. I am trying to run the program 'dot' (part of Graphviz) from Python: # -*- coding: utf-8 -*- import os print os . environ [ 'PATH' ] print os . system ( "ls >> a.txt" ) print os . system ( "dot -o9.png -Tpng ./6.dot" ) The command "ls" is there just to make sure that python is in the correct directory. It is. The result that I get is: /usr/bin:/bin:/usr/sbin:/sbin 0 32512 My understanding is that 32512 error means that python could not find the file, and since the file 6.dot is there (If I run

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 want to plot trees using Python. Decision trees, Organizational charts, etc. Any library that helps me with that? 回答1: There's graphviz - http://www.graphviz.org/ . It uses the "DOT" language to plot graphs. You can either generate the DOT code yourself, or use pydot - https://code.google.com/p/pydot/ . You could also use networkx - http://networkx.lanl.gov/tutorial/tutorial.html#drawing-graphs , which make it easy to draw to either graphviz or matplotlib. networkx + matplotlib + graphviz gives you the most flexibility and power, but you