V = {v1,v2,}(vector,row or column),V[[i]](https://assets.b3logfile.com/siyuan/1619246215189/ithelement of V),V1.V2 (dot product), M = ffrou},{rou},…}(matrix),M[[i]](https://assets.b3logfile.com/siyuan/1619246215189/ithrow of M), Part[M,All,j](https://assets.b3logfil...
大概代码就是先RemoveBackground，然后ComponentMeasurements+Trim取图像。但是我岂能止步于此？原图可是矢量化...
page = 99(*最大可以是1000*); CreateDirectory["qiushi"]; getContent = Cases[#, XMLElement[ "div", {"class" -> "content", "title" -> _}, {str_String}] :> StringReplace[str, "\n" :> ""], Infinity] &; getPicture = Cases[#, XMLElement[ "div", {"class" -> "thumb"}, ...
← atomicnumber is now the fi rst element of $ContextPath in which au appears. ← Global` comes before atomicweight` and atomicnumber` in $ContextPath. APPENDIX 337 It is often convenient to define a function whose value is a module. This allows considerably more flex- ibility when ...
Mathematica使⽤教程 第⼆章 Mathematica 简介 Mathematica 是⼀个符号计算与数值计算的通⽤数学软件包，是由美国的物理学家Stephen Wolfram 所领导的⼀个⼩组开发成功并推向市场的。Mathematica 由最初的1.0、1.2、2.0、2.2、2.4、3.0版，到现在的4.0版，⽬前国内常⽤的版本是Windows 下的3....
FileNameSplit@nameDsplitthefilenameintoalistofdirectoryandfilenames FileNameJoin@8dir1,…Dcombinealistofdirectoryandfilenamesintothefilename FileNameTake@name,…Dextractpartofthefilename FileNameDrop@name,…Ddroppartsofthefilename FileNameDepth@nameDgetthenumberofpathelementsinthefilename $PathnameSepa...
Mathematica 软件简介 Mathematica 是美国 Wolfram Research 公 司开发的著名数学软件,它给人们提供了一个方便 的数学计算平台,使复杂的数值计算和符号运算方 便、快捷。 一、Mathematica 的主要功能 1、符号运算功能:Mathematica 最突出的特点就 是具有强大的符号运算功能,能和人一样进行带字 母的运算,得到精确的结果...
The argument “images” is a list of image URLs, image file names, or image Base64 representations. (Any combination of those element types can be specified.) Before demonstrating the vision functionality below we first obtain and show a couple of images. Images Here is a URL of an image:...
How to find all elements in one list which are not in another; how to find all elements which are in one of two lists but not both. map filter reduce universal and existential tests min and max element shuffle and sample How to shuffle an array. How to extract a random sample from an...
element["AllText", "text"] Remove existing elements and text beneath element and replace with "text". element["ID"] The ID attribute. element["ClassNames"] List of classes in the class attribute. element["Value"] The value attribute, if the element has it. element["HasAttribute", "attr...