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HomeDatabaseMysql TutorialMatlab中的矩阵用法2

(1)特殊向量 t=[0:0.1:10] %产生从0~10的行向量,元素之间的间隔为0.1 t=linspace(n1,n2,n) %产生n1和n2之间线性均匀分布的n个数(默认n时,产生100个数) t=lonspace(n1,n2,n) %默认n时,产生50个数 (2)特殊矩阵 eye(m) %生成m阶单位矩阵 eye(m,n) %m阶

(1)特殊向量

     t=[0:0.1:10]    %产生从0~10的行向量,元素之间的间隔为0.1
     t=linspace(n1,n2,n)  %产生n1和n2之间线性均匀分布的n个数(默认n时,产生100个数)
     t=lonspace(n1,n2,n) %默认n时,产生50个数

(2)特殊矩阵

     eye(m) %生成m阶单位矩阵
     eye(m,n) %m阶单位矩阵的第n列
     eye(size(a)) %与矩阵a同等阶数的单位阵

(3)所有元素为1的矩阵(也叫全1矩阵)

     ones(n) %全1的n阶矩阵

     ones(size(A)) %与A同阶的全1矩阵
     ones(m,n) %m阶全1矩阵的第n列

(4)所有元素为0的矩阵(也叫全0矩阵)

     zeros(n)  %全0的n阶矩阵

     zeros(size(A)) %与A同阶的全0矩阵

     zeros(m,n)  %m阶全0矩阵的第n列

(5)空矩阵

       q=[] %空矩阵是一个特殊的矩阵,这在线性代数中是不存在的。不过,它可以用来删除矩阵的行与列。

        B(2,:)=[] %删除矩阵B的第2行  
        B(:,3)=[] %删除矩阵B的第3列

(6)随机数矩阵

    rand(m,n) %产生m×n矩阵,其中的元素是服从[0,1]上均匀分布的随机数;

   normrnd(mu,sigma,m,n)  %产生m×n矩阵,其中的元素是服从均值为mu、标准差为sigma的正态分布的随机数;

   exprnd(mu,m,n)   %产生m×n矩阵,其中的元素是服从均值为mu的指数分布的随机数;

   poissrnd(mu,m,n)  %产生m×n矩阵,其中的元素是服从均值为mu的泊松分布的随机数;

   unifrnd(a,b,m,n)    %产生m×n矩阵,其中的元素是服从区间[a,b]山均匀分布的随机数;

(7)随机置换

    randperm(n)  %产生1~n的一个随机全排列

    perms([1:n])  %产生1~n的所有全排列

(8)求矩阵的逆

    inv(a) %求矩阵a的逆

 (9)方阵b对应的行列式的值

   det(b) %方阵b对应的行列式的值

 

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