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什么是矩阵?
前一阵找工作的时候,经常有人问我数学怎么样。有些问的比较笼统,有些问的比较具体。比如有个人问我,你了解矩阵吗?我说不了解。在看《3D数学基础》之前,矩阵给我的感觉就跟黑客帝国差不多。为此我特意上easyicon下了个matrix的图标当头像,感觉就是酷。那到底矩阵是什么? 如果现在有人问我,你...
分类:其他好文   时间:2014-11-15 14:01:01    阅读次数:149
Set Matrix Zeroes 将矩阵置零
给定一个矩阵,把零值所在的行和列都置为零。例如:1 2 31 0 31 1 1操作之后变为1 0 30 0 01 0 1方法1:赋值另存一个m*n的矩阵,在原矩阵为零的值相应置新的矩阵行和列为零。额外空间为O(m*n).方法2:两个数组,bool[m] 和 bool[n] 分别存某行有零,后者某列有...
分类:其他好文   时间:2014-11-15 12:52:48    阅读次数:284
[Leetcode] Rotate Image
You are given annxn2D matrix representing an image.Rotate the image by 90 degrees (clockwise).Follow up:Could you do this in-place?Solution:public cla...
分类:其他好文   时间:2014-11-14 17:15:48    阅读次数:159
Python SciPy Sparse模块学习笔记
1.sparse模块的官方document地址:http://docs.scipy.org/doc/scipy/reference/sparse.html2.sparse matrix的存储形式有很多种,见此帖子http://blog.csdn.net/anshan1984/article/deta...
分类:编程语言   时间:2014-11-13 12:25:23    阅读次数:413
python 之 theano学习:
(1)theano主要支持符号矩阵表达式(2)theano与numpy中都有broadcasting:numpy中是动态的,而theano需要在这之前就知道是哪维需要被广播。针对不同类型的数据给出如下的一张表,基本类型包括scalar、vector、row、col、matrix、tensor3、te...
分类:编程语言   时间:2014-11-13 10:48:58    阅读次数:293
[詹兴致矩阵论习题参考解答]序言
This book was done during the course of the author's reading ``matrix theory'' by Prof. X.Z. Zhan from 22nd Oct. 2014 to 13th Nov. 2104.Thank Prof. X....
分类:其他好文   时间:2014-11-13 09:20:19    阅读次数:187
OpenCV Tutorials —— Mat
if you pass on an already existing Mat object, which has already allocated the required space for the matrix, this will be reused. The idea is that ea...
分类:其他好文   时间:2014-11-12 21:13:24    阅读次数:336
[leetcode]Spiral Matrix II
问题描述: Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example, Given n = 3, You should return the following matrix: [ [ 1, 2, 3 ], [ 8, 9,...
分类:其他好文   时间:2014-11-12 15:06:18    阅读次数:183
[leetcode]Spiral Matrix
问题描述: Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. For example, Given the following matrix: [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9...
分类:其他好文   时间:2014-11-12 13:49:06    阅读次数:210
水面shader 线性擦除
// Upgrade NOTE: replaced 'PositionFog()' with multiply of UNITY_MATRIX_MVP by position// Upgrade NOTE: replaced 'V2F_POS_FOG' with 'float4 pos : SV_P...
分类:其他好文   时间:2014-11-11 20:45:16    阅读次数:494
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