rand生成均勻分布的偽函數(shù)，分布在（0~1）
之間
E=(:,:,1)=randn(10,5)
randn生成標(biāo)準(zhǔn)正態(tài)分布的偽隨機數(shù)（均值為
0，方差為1）
E=(:,:,1)=randi(10,5)
randi生成均勻分布的偽隨機整數(shù)
D=inv(A) Matrix inversion [Non-squ百思特網(wǎng)are
matrix cannot be inverted]
E=zeros(10,5,3) generates ten rows and
five columns with three digits 0 E=(:,:,1) in the matrix command window means a one-dimensional matrix
E=(:,:,1)=rand(10,5)
rand generates a uniformly distributed pseudo function, distributed in (0~1)
between
E=(:,:,1)=randn(10,5)
randn generates pseudorandom numbers from a standard normal distribution (the mean is0, variance is 1)
E=(:,:,1)=randi(10,5)
Randi generates uniformly distributed pseudo-random integers
3元胞數(shù)組
元胞數(shù)組是MATLAB中特有的一種數(shù)據(jù)類型，是數(shù)組的一種，其內(nèi)部元素可以是屬于不同的數(shù)據(jù)類型，概念理解上，可以認為它和c語言里面的結(jié)構(gòu)體、c 里面的對象很類似 。元胞數(shù)組是matlab中的特色數(shù)據(jù)類型，它不同于其它數(shù)據(jù)類型(如字符型，字符數(shù)組或者叫字符串，以及一般的算術(shù)數(shù)據(jù)和數(shù)組) 。它特有的存取數(shù)據(jù)方法決定了它的特點，它有給人一種查詢信息的感覺，可以逐漸追蹤一直到所有的變量全部翻譯成基本的數(shù)據(jù)信息 。它的class函數(shù)輸出就是cell 。
Cell array is a unique data type in MATLAB. It is a kind of array. Its internal elements can belong to different data types. In terms of conceptual understanding, it can be regarded as very similar to the structure in the C language and the objects in C . similar. Cell array is a characteristic data type in matlab, which is different from other data types (such as character type, character array or string, and general arithmetic data and array). Its unique data access method determines its characteristics. It gives people a feeling of querying information, and it can be tracked gradually until all variables are translated into basic data information. The output of its class function is cell.
設(shè)置A=cell(1,6)
Set A=cell(1,6)
A{2}=eye(3) 表示生成3×3的對角線數(shù)值為1的單位矩陣
A{2}=eye(3) generates a 3×3 identity matrix with a diagonal value of 1
A{5}=magic(5)
A{5}=magic(5)
magic(n)生成一個n階幻方，就是把1-n^2排成一個nxn的矩陣，使得矩陣的每行、每列，以及主、副對角線上面的n個數(shù)之和都相等(容易證明，這個和等于n*(n^2 1)/2) 。
magic(n) generates a magic square of order n, which is to arrange 1-n^2 into an nxn matrix, so that the sum of n numbers on each row, each column, and the main and sub diagonals of the matrix are equal (It is easy to prove that this sum is equal to n*(n^2 1)/2).
B=A{5} 即A{5}賦值給了B
B=A{5} ie A{5} is assigned to B
04結(jié)構(gòu)體 Structure
Books=struct(’name’,{{Machine Learning’,’Data Mining’}},’price’,[30 40])
( )內(nèi)的幾位結(jié)構(gòu)體，賦值給books
Books=struct(’name’,{{Machine Learning’,’Data Mining’}},’price’,[30 40])
Several structures in (), assigned to books
Books.name 在books中選取name的屬性
Books.name select the attribute of name in books
Books.name(1)
Books.name{1}
#
Matlab矩陣操作
Matlab matrix operations
#
1. 矩陣的定義與構(gòu)造
設(shè)置A=[1 2 3 5； 8 5 4 6]
The definition and construction of matrix
Set A=[1 2 3 5; 8 5 4 6]
B=1：2：9
其中1、2分別確定最大值 ，2為步長
B=1：2：9
Among them, 1 and 2 respectively determine the maximum value, and 2 is the step size
C=repmat(B,3,1) 重復(fù)
C=repmat(B,3,1)repeat
D=ones(2,4) 表示生成一個2行4列且值均為1的矩陣

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