本文共 630 字，大约阅读时间需要 2 分钟。

A = [1,2,3;4,5,6]
B = zeros(2,3)%0矩阵
C = eye(3,3)%单位矩阵
D = ones(3,3)%全1矩阵
D = 0:1:5%a:inc:b
E = linspace(0,pi,10)%a,b,n
E = logspace(0,pi,10)%a,b,n
F = diag(A,0)%提取对角矩阵0
F = diag(A,1)%提取对角矩阵上1
F = diag(A,-1)%提取对角矩阵下-1
F = triu(A) %上三角矩阵
F = triu(A,1)
F = triu(A,-1)
F = A’ %转置
F = rot90(A) %旋转90度
F = rot90(A,2)
F = fliplr(A) %左右翻转
F = flipud(A) %上下翻转
det© %行列式的值 方阵
rank(A) %矩阵的秩
F = [A B] %增广矩阵
F = inv© %矩阵的逆矩阵 需为方阵
%特征值和特征向量
eig©
[v d] = eig©
%稀疏矩阵
as = sparse©
s = sparse([3 2 3 4 1],[1 2 2 3 4],[1 2 3 4 5],4,4,5)
full(as) %稀疏矩阵转换为满秩矩阵
nnz(as) %非零元素个数
spy(eye(3)) %绘制非零元素位置

system_dependent memstats %内存状态
pack %整理内存碎片