cd 'D:\matlab\'

A=[1,2;3,4;5,6];
B=A(2,:);
C=A([1,3],:);

sz=size(A);
size1=size(A,1);
size2=size(A,2);

D=[A,[100;200;300]];
E=A(:);

v=[1 2 3 4 5 6];
length1=length(v);

load X.txt

who
whos

m=X(1:1);

save hello.mat A
save hello.txt A -ascii

A=[1,2;3,4;5,6];
B=[10,20;30,40;50,60];

C=[2,3;4,5];

D=A*C;
E=A.*B;
F=A.^2;
G=log(A);
H=exp(A);
I=abs(A);
J=A+1;

K=A';
[val,ind]=max(A);
L=A<3;
M=magic(4);

N=sum(A);
O=prod(A);

P=eye(7);
Q=flipud(eye(7));

R=pinv(A);
%floor 向下取整  ceil  向上取整
pwd