MATLAB_实验_1

help
lookfor inv
help inv
which inv
z1=(2sin(85/180pi))/(1+exp(2));
x=[2 1+2i;-0.45 5];
z2=(1/2)log(x+sqrt(1+x^2));
a=-3:0.1:3;
z3=((exp(0.3.a)-exp(-0.3.a))/2).sin(a+0.3)+log((a+0.3)/2);
plot(a,z3)

t=0:0.5:2.5;
m=(t.^2).(t>=0 & t<1)+(t.^2-1).(t>=1 & t<2)+(t.^2-2t+1).(t>=2 & t<3)

A=[12 34 -4; 34 7 87; 3 65 7]
B=[1 3 -1; 2 0 3; 3 -2 7]
A+6B
I=eye(3)
A-B+I
A.B
A^3
A.^3
A/B
A\B
[A,B]
[A([1,3]😅;B^2]