001双峰曲线图： z=peaks(40); mesh(z); surf(z)
002解方程：
A=[3,4,-2;6,2,-3;45,5,4]; >> B=[14;4;23]; >> root=inv(A)*B
003傅里叶变换 load mtlb ;
subplot(2,1,1); plot(mtlb);
>> title('原始语音信息'); >> y=fft(mtlb); >> subplot(2,1,2); >> yy=abs(y); >> plot(yy);
>> title('傅里叶变换')
004输入函数：
a=input('How many apples\\n','s')
005输出函数
a=[1 2 3 4 ;5 6 7 8;12 23 34 45;34 435 23 34] a =
1 2 3 4 5 6 7 8 12 23 34 45 34 435 23 34 disp(a) a =
1 2 3 4 5 6 7 8 12 23 34 45
34 435 23 34
b=input('how many people\\n' ,'s')
1
how many people two people b =
two people
>> disp(b) two people >>
006求一元二次方程的根 a=1;b=2;c=3; d=sqrt(b^2-4*a*c); x1=(-b+d)/(2*a) x1 =
-1.0000 + 1.4142i
>> x2=(-b-d)/(2*a) x2 =
-1.0000 - 1.4142i
007求矩阵的相乘、转置、存盘、读入数据A=[1 3 5 ;2 4 6;-1 0 -2;-3 0 0]; >> B=[-1 3;-2 2;2 1]; >> C=A*B C =
3 14 2 20 -3 -5 3 -9 >> C=C' C =
2
3 2 -3 3 14 20 -5 -9
>> save mydat C >> clear >> load mydat C
008编写数学计算公式： A=2.1;B=-4.5;C=6;D=3.5;E=-5; K=atan(((2*pi*A)+E/(2*pi*B*C))/D) K =
1.3121
009
A=[1 0 -1;2 4 1;-2 0 5]; >> B=[0 -1 0;2 1 3;1 1 2]; >> H=2*A+B H =
2 -1 -2 6 9 5 -3 1 12
>> M=A^2-3*B M =
3 3 -6 2 13 -2 -15 -3 21
>> Y=A*B Y =
-1 -2 -2 9 3 14 5 7 10
3
>> R=B*A
R =
-2 -4 -1 -2 4 14 -1 4 10
>> E=A.*B E =
0 0 0 4 4 3 -2 0 10
>> W=A\\B W =
0.3333 -1.3333 0.6667 0.2500 1.0000 0.2500 0.3333 -0.3333 0.6667
>> P=A/B P =
-2.0000 3.0000 -5.0000 -5.0000 3.0000 -4.0000 7.0000 -9.0000 16.0000
>> Z=A.\\B
Warning: Divide by zero. Z =
0 -Inf 0 1.0000 0.2500 3.0000 -0.5000 Inf 0.4000
>> D=A./B
Warning: Divide by zero.
4
D =
Inf 0 -Inf 1.0000 4.0000 0.3333 -2.0000 0 2.5000 010
a=4.96;b=8.11;
>> M=exp(a+b)/log10(a+b) M =
4.2507e+005
011求三角形面积： a=9.6;b=13.7;c=19.4; >> s=(a+b+c)/2;
>> area=sqrt(s*(s-a)*(s-b)*(s-c))
area =
61.1739
012逻辑运算
A=[-1 0 -6 8;-9 4 0 12.3;0 0 -5.1 -2;0 -23 0 -7]; >> B=A(:,1:2) B =
-1 0 -9 4 0 0 0 -23
>> C=A(1:2,:) C =
-1.0000 0 -6.0000 8.0000 -9.0000 4.0000 0 12.3000
5