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NumPy 线性代数

由 十年热恋 提交于 2019-11-27 12:24:08
章节 Numpy 介绍 Numpy 安装 NumPy ndarray NumPy 数据类型 NumPy 数组创建 NumPy 基于已有数据创建数组 NumPy 基于数值区间创建数组 NumPy 数组切片 NumPy 广播 NumPy 数组迭代 NumPy 位运算 NumPy 字符串函数 NumPy 数学函数 NumPy 统计函数 NumPy 排序、查找、计数 NumPy 副本和视图 NumPy 矩阵库函数 NumPy 线性代数 NumPy中包含了numpy.linalg模块，提供线性代数运算功能。下表描述了该模块中的一些重要功能。 SN 函数 描述 1 dot() 两个数组的点积 2 vdot() 两个向量的点积 3 inner() 两个数组的内积 4 matmul() 两个数组的矩阵乘积 5 det() 计算矩阵的行列式 6 solve() 解线性矩阵方程 7 inv() 求矩阵的乘法逆矩阵 numpy.dot() numpy.dot() 计算两个数组的点积。 示例 import numpy as np a = np.array([[100,200],[23,12]]) b = np.array([[10,20],[12,21]]) dot = np.dot(a,b) #[100 * 10 + 200 * 12, 100 * 20 + 200 * 21] [23*10+12*12

Converting dot to png in python

由 不打扰是莪最后的温柔 提交于 2019-11-27 12:03:28
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

Graphviz, changing the size of edge

由 亡梦爱人 提交于 2019-11-27 10:13:22
问题 How to change the size of edge in dot (graphviz)? I would like to make some edges "bolded". 回答1: I wanted to supplement shuvalov's answer. penwidth is indeed the correct command. Additionally, in shuvalov's answer penwidth is both a node and an edge property--also correct. The distinction i wanted to make: penwidth , when used as a node property (e.g., "NodeA" [penwidth = 5]) affects the border line weight for that node penwidth , when used as a edge property affects the line weight of the

How do I set the resolution when converting dot files (graphviz) to images?

由 有些话、适合烂在心里 提交于 2019-11-27 10:06:51
问题 I tried $ dot -Tpng rel_graph.gv > rel_graph.png but the resulting image has a very low quality. 回答1: Use the dpi attribute. Example: graph G { graph [ dpi = 300 ]; /* The rest of your graph here. */ } 回答2: dot -Tpng -Gdpi=300 foo.gv > foo110percent.png Use option -Gdpi. You can find more information here. 回答3: I find GraphViz draws nice Graphs but the resolution tends to be reasonably low, you could try outputting to SVG and then using some other image package to scale the image

How to control subgraphs' layout in dot?

由 核能气质少年 提交于 2019-11-27 09:37:35
问题 i have a digraph composed of many independant and simple subgraphs of various sizes. dot lays all these subgraphs horizontally, so i end up with a 40000x200 output file, e.g: G1 G2 G3 G.....4 G5 How do i tell dot to layout these subgraphs in both dimensions to get something like: G1 G2 G3 G.....4 G5 Thanks. 回答1: The steps to achieve this uses multiple graphviz tools which can be piped together. The following line is a possible configuration, graph.dot being the file which contains your graph

Reading DOT files in javascript/d3

由 假装没事ソ 提交于 2019-11-27 09:30:09
问题 Is there a standard way to read and parse DOT graph files in javascript, ideally in way that will work nicely in d3? Currently, the only thing I can think of doing is reading plain text and doing my own parsing. Hopefully this'd be reinventing the wheel though. d3.text("graph.dot", function(error, dotGraph) { .... )}; 回答1: To get Graphviz DOT files rendered in Javascript, combine the graphlib-dot and dagre-d3 libraries. The graphlibDot.parse() method takes a graph or digraph definition in DOT

How to add edge labels in Graphviz?

由 ＊爱你＆永不变心＊ 提交于 2019-11-27 09:27:17
问题 I am trying to draw a graph using Graphviz, but I need to add labels on the edges. There does not seem to be any way to that in Graphviz. Are there a way out? 回答1: You use the label property attached to the edge. digraph G { a -> b [ label="a to b" ]; b -> c [ label="another label"]; } The above generates a graph that looks something like this. 回答2: @Andrew Walker has given a great answer! It's also worth being aware of the labeltooltip attribute. This allows an additional string to be

How can I create named edge “types” in Graphviz/dot/neato?

由 折月煮酒 提交于 2019-11-27 08:10:40
问题 I need to draw a diagram with graphviz/dot where there are common edge types between nodes and am trying to find a way to define a label for each type of edge and then use that label multiple times in the diagram. For example imagine the traditional ceiling fan FSM example where it's initially in state OFF and every time someone pulls the cord it changes to a new state based on the speed of the fan: Pull Pull Pull OFF ------> HIGH ------> MED ------> LOW ^ | | Pull | +------------------------

Enforcing horizontal node ordering in a .dot tree

由 99封情书 提交于 2019-11-27 07:39:43
I am trying to recreate an example diagram for a binary search tree with GraphViz. This is how it should look in the end: This is my first attempt: digraph G { nodesep=0.3; ranksep=0.2; margin=0.1; node [shape=circle]; edge [arrowsize=0.8]; 6 -> 4; 6 -> 11; 4 -> 2; 4 -> 5; 2 -> 1; 2 -> 3; 11 -> 8; 11 -> 14; 8 -> 7; 8 -> 10; 10 -> 9; 14 -> 13; 14 -> 16; 13 -> 12; 16 -> 15; 16 -> 17; } But unfortunately GraphViz doesn't care about the horizontal positions of the tree, so I get: How can I add constraints so that the horizontal positions of the vertices reflects their total ordering? marapet You

Forcing “main line” nodes into a straight line in Graphviz (or alternatives)

由 风流意气都作罢 提交于 2019-11-27 05:26:00
问题 I'm trying to use Graphviz dot (but am willing to use something else) to generate a graph with a long "main line" of nodes, and many small branches. I'd like the main line to be straight from left to right, with the small branches above or below it. However, Graphviz "balances" the two branches, so I end up with a crooked graph. To illustrate, here's a sketch similar to what I currently get: And this is what I actually want: Is there any way to force or encourage Graphviz to generate a graph
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