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RSS订阅转载 LAPACK库
一、LAPACK库的地址LAPACK（Linear Algebra PACKage）库，是用Fortran语言编写的线性代数计算库，包含线性方程组求解（AX=b）、矩阵分解、矩阵求逆、求矩阵特征值、奇异值等。该库用BLAS库做底层运算，许多高层的数学库都用BLAS和LAPACK做底层。LAPACK is written in Fortran90 and prov...
2019-12-13 14:24:02
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转载 LAPACK 求矩阵的逆
整理后转载！！！！=======================================================================I would like to be able to compute the inverse of a generalNxNmatrix in C/C++ using lapack.My understanding is t...
2019-12-13 09:15:56
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转载 C语言的头文件和宏定义详解
转载地：C语言的头文件和宏定义详解 - 清风阁https://blog.csdn.net/abc_12366/article/details/79155540
2019-12-13 08:59:44
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转载 强大的矩阵奇异值分解(SVD)及其应用
源地址：《机器学习中的数学(5)-强大的矩阵奇异值分解(SVD)及其应用》https://www.cnblogs.com/LeftNotEasy/archive/2011/01/19/svd-and-applications.html《理解矩阵系列,强推！！》http://blog.csdn.net/myan/article/details/647511...
2019-12-12 20:28:56
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转载 Word 撰写论文: 公式居中、编号右对齐
要写论文的小童学自己学习一下啦！转载只为便于自己查看o转载地：https://blog.csdn.net/zaishuiyifangxym/article/details/81709319
2019-11-28 20:21:42
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转载 【雅思大作文考官范文】——第二十篇： 'university subjects'
题目：Some people think that all university students should study whatever they like. Others believe that they should only be allowed to study subjects that will be useful in the future, such as those ...
2019-11-24 09:27:55
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原创 Matlab中 x0 = zeros(size(x,1),size(x,2)); 表示什么含义
size ( x, 1 )指矩阵的行数；size（x，2）就是矩阵的列数；然后，zeros（m，n）是指建立一个，m*n的0矩阵。等式 x0 =zeros(size(x,1),size(x,2))则表示取x的行数和列数赋值为零给x0。...
2019-11-16 21:24:50
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原创 Matlab中同时注释掉多行
matlab中注释掉一句命令，在其首部加“%”；若要注释掉多行，只需先选中这些行，然后按下快捷键“ctrl+R”。若要取消多行注释，则需选中这些行，按下“ctrl+T”。...
2019-11-11 13:47:06
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转载 【雅思大作文考官范文】——第十九篇：独居人口' essay
题目：In some countries, many more people are choosing to live alone nowadays than in the past. Do you think this is a positive or negative development?一些国家，选择独居的人比过去多得多。你认为这种发展是积极的还是消极的？范文：In...
2019-11-10 15:07:53
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原创 Matlab中左除（\）与右除（/）的区别
简单记忆：向左倒是左除\，向右倒是右除//：右除：a/b表示矩阵a乘以矩阵b的逆\：左除：a\b表示矩阵a的逆乘以b。./：右除：a./b表示矩阵a中的每个元素除以矩阵b的对应的元素。.\：左除：a.\b表示矩阵b中的每个元素除以矩阵a的对应的元素。-----------------------------------------------------------------...
2019-11-09 21:33:22
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原创 matlab中lsqr函数用法
lsqrLSQR 方法语法x = lsqr(A,b)lsqr(A,b,tol)lsqr(A,b,tol,maxit)lsqr(A,b,tol,maxit,M)lsqr(A,b,tol,maxit,M1,M2)lsqr(A,b,tol,maxit,M1,M2,x0)[x,flag] = lsqr(A,b,tol,maxit,M1,M2,x0)[x,flag,relres] ...
2019-11-05 10:38:21
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原创 矩阵和向量共轭
矩阵包括实数矩阵和复数矩阵。矩阵的转置是将其行列互换位置，矩阵的共轭转置则是在矩阵转置的基础上（行列互换位置）对其每一个元素取共轭。形如 a+bi的复数，其共轭为a-bi。实数的共轭等于它本身。所以，实数矩阵的共轭转置矩阵就是转置矩阵，复数矩阵的共轭转置矩阵就是行列互换位置后每个元素取共轭。在Fortran中，其调用函数为： CONJG(x) 求...
2019-10-29 16:49:12
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原创 matlab中size（）函数的用法
size（）：获取矩阵的行数和列数1）s=size（A）,当只有一个输出参数时，返回一个行向量，该行向量的第一个元素时矩阵的行数，第二个元素是矩阵的列数。2）[h,l]=size（A）,当有两个输出参数时，size函数将矩阵的行数返回到第一个输出变量h，将矩阵的列数返回到第二个输出变量l。3）size（A，n）如果在size函数的输入参数中...
2019-10-24 08:46:42
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转载 【雅思大作文考官范文】——第十九篇：'university subjects'话题
题目 Some people think that all university students should study whatever they like. Others believe that they should only be allowed to study subjects that will be useful in the future, such as th...
2019-09-27 22:29:06
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转载 【雅思大作文考官范文】——第十八篇：“problem and solution essay”
题目： More and more people are migrating to cities in search of a better life, but city life can be extremely difficult. Explain some of the difficulties of living in a city. How can governments ...
2019-09-17 20:15:24
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转载 【雅思大作文考官范文】——第十七篇： 'economic progress' essay
题目：Many governments think that economic progress is their most important goal. Some people, however, think that other types of progress are equally important for a country. Discuss both these views...
2019-09-06 21:02:54
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转载 【雅思大作文考官范文】——第十六篇：climate change essay
题目：Some people think that instead of preventing climate change, we need to find a way to live with it. To what extent do you agree or disagree?有些人认为，我们需要找到一种方式来应对气候变化，而不是阻止气候变化。你在多大程度上同意或不同意？范...
2019-09-05 22:59:16
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原创 学术会议检索网，总有一个适合你！
1．国际学术会议http://www.allconferences.com/ 世界范围各学科的学术会议信息预报。可按多项条件检索。2．Calender of Upcoming Technical Conferenceshttp://www.techexpo.com/提供世界范围内的专业技术会议报道情况。一般报道6年的会议安排。检索时可按时间顺序，也可按会议名称、主题、主办单位、国家...
2019-09-04 13:58:38
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原创 【C语言程序设计进阶】字符串数组
1、定义char **a //a是一个指针，指向另一个指针，那个指针指向一个（字符串）char a[][] //程序中a的第二维需要有确切的值char *a[] //与char a[][]不同，它是通过指针指向外部内容示例：#include <stdio.h>int main(void){ //a[0]-->char* ...
2019-09-04 10:03:35
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原创 【C语言程序设计进阶】单字符输入输出：putchar与getchar
1、Putchar:向标准输出写一个字符，返回写了几个字符，EOF（-1）表示写失败int putchar(int c);2、 getchar:从标准输入读入一个字符，返回类型是int是为了返回EOF（-1）Windows——>Ctrl-ZLinux——>Ctrl-Dint getchar（void）3、代码示例#include<stdio....
2019-09-04 09:41:30
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原创 【C语言程序设计进阶】使用malloc对数组进行动态内存分配
在Linux终端窗口中键入：man malloc——可以查看malloc的相关信息1、使用该函数需要在C语言程序中加入 :#include<stdlib.h>2、使用方式void* malloc(size_t size);向malloc申请的空间大小是以字节为单位的；返回的结果是void*，需要类型转换为自己需要的类型(int*) malloc(n*siz...
2019-09-04 09:18:53
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转载 【雅思大作文考官范文】——第十五篇：'high salaries' essay
题目：In many countries, a small number of people earn extremely high salaries. Some people believe that this is good for the country, but others think that governments should not allow salaries above ...
2019-09-03 14:11:37
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转载 【雅思大作文考官范文】——第十四篇：festivals essay
题目：Most people have forgotten the meaning behind traditional or religious festivals; during festival periods, people nowadays only want to enjoy themselves. To what extent do you agree or disagree w...
2019-09-02 10:29:58
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转载 【雅思大作文考官范文】——第十三篇：'traditions and technology' essay
题目：It is inevitable that traditional cultures will be lost as technology develops. Technology and traditional cultures are incompatible. To what extent do you agree or disagree with this view?随着技术...
2019-08-29 22:25:20
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转载 【雅思大作文考官范文】——第十二篇：'positive or negative' essay
题目：Some universities now offer their courses on the Internet so that people can study online. Is this a positive or negative development?一些大学现在互联网上提供他们的课程，以便人们可以在线学习。这是一个积极的还是消极的发展？范文： It i...
2019-08-29 08:21:13
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转载 【雅思大作文考官范文】——第十一篇：'homework' essay
题目：Some people believe that school children should not be given homework by their teachers, whereas others argue that homework plays an important role in the education of children. Discuss both of t...
2019-08-28 09:02:41
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转载 【雅思大作文考官范文】——第十篇：'permissive parenting' answer
题目：Some parents buy their children whatever they ask for, and allow their children to do whatever they want. Is this a good way to raise children? What consequences could this style of parenting hav...
2019-08-27 09:53:33
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转载 【雅思大作文考官范文】——第九篇：‘CCTV essay’
题目： In many cities the use of video cameras in public places is being increased in order to reduce crime, but some people believe that these measures restrict our individual freedom. Do the ben...
2019-08-16 09:20:47
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转载 【雅思大作文考官范文】——第八篇：recycling essay（垃圾回收）
题目：Some people claim that not enough of the waste from homes is recycled. They say that the only way to increase recycling is for governments to make it a legal requirement. To what extent do you t...
2019-08-15 09:33:54
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转载 【雅思大作文考官范文】——第七篇： 'dress code' essay
题目：Some people think that employers should not care about the way their employees dress, because what matters is the quality of their work. To what extent do you agree or disagree?范文： In the...
2019-08-14 10:26:00
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转载 C语言指针详解(经典,非常详细)
前言:复杂类型说明要了解指针,多多少少会出现一些比较复杂的类型,所以我先介绍一下如何完全理解一个复杂类型,要理解复杂类型其实很简单,一个类型里会出现很多运算符,他们也像普通的表达式一样,有优先级,其优先级和运算优先级一样,所以我总结了一下其原则:从变量名处起,根据运算符优先级结合,一步一步分析.下面让我们先从简单的类型开始慢慢分析吧:int p; //这是一个普通的整型变量 ...
2019-08-13 09:16:40
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原创 memcpy()实现二维数组拷贝
#include <stdio.h>#include <string.h>#include <stdlib.h>void printarr2d(int (*a)[3],int row,int col);int main(){ int i,j; int a[2][3] = {{1,2,3},{4,5,6}}; int b[4][...
2019-08-12 14:52:23
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转载 【雅思大作文考官范文】——第六篇： 'parenting course' essay
问题：Caring for children is probably the most important job in any society. Because of this, all mothers and fathers should be required to take a course that prepares them to be good parents. To what ...
2019-08-09 20:57:07
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转载 【雅思大作文考官范文】——第五篇： 'literature and history' essay
问题：Some people believe that it is more important to teach children the literature and history of their own country, rather than the literature and history of other countries. To what extent do you a...
2019-08-07 09:08:12
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原创 矩阵点乘和叉乘
1、矩阵叉乘矩阵的乘法就是矩阵a的第一行乘以矩阵b的第一列，各个元素对应相乘然后求和作为第一元素的值。矩阵只有当左边矩阵的列数等于右边矩阵的行数时,它们才可以相乘,乘积矩阵的行数等于左边矩阵的行数,乘积矩阵的列数等于右边矩阵的列数 。Matlab源码：a=[1 0 2;-1 3 1];b=[3 1;2 1;1 0];c=a*b;fprintf('\na = \n');di...
2019-08-01 10:26:13
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转载 向量点乘（内积）和叉乘（外积、向量积）概念及几何意义解读
转载地：https://blog.csdn.net/dcrmg/article/details/52416832==========================================================向量是由n个实数组成的一个n行1列（n1）或一个1行n列（1n）的有序数组；向量的点乘,也叫向量的内积、数量积，对两个向量执行点乘运算，就是对这两个向量对应位一一相乘...
2019-07-30 22:33:21
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转载 【雅思大作文考官范文】——第四篇： 'power of advertising' essay
转载地：https://ielts-simon.com/题目：Today, the high sales of popular consumer goods reflect the power of advertising and not the real needs of the society in which they are sold. To what extent do you ag...
2019-07-29 19:23:25
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原创 SU学习笔记——相关网站链接整理
Comparison of free geophysics software:https://en.wikipedia.org/wiki/Co …Madagascar:http://www.ahay.org/wiki/Main_PageMadagascar Programs:http://www.ahay.org/RSF/CWP:http://cwp.mines.edu/CREWS: ht...
2019-07-24 08:54:02
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转载 【雅思大作文考官范文】——第三篇：essay 'skeleton'（散文“骨架”）
转载地：https://ielts-simon.com/雅思七分作文更新：多看多写，才会有进步噢！！题目：Some people believe that developments in the field of artificial intelligence will have a positive impact on our lives in the near future. Other...
2019-07-19 21:59:28
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