matlab编程
d=sym(3*x^3-2*x+1);diff(d,2)
ezplot('cos(x)',)//4.2
ezplot('(cos(t))^3','(sin(t))^3',)//4.3
ezplot('exp(x)+sin(x*y)',[-2,0.5,0,2])//4.4
fminbnd('x+3*(x^2+cos(x))',-1,1) //直接求
f=sym('x+3*(x^2+cos(x))');//由导数为零来求解
ff=solve(diff(f));
subs(f,x,ff),subs(f,x,-1),subs(f,x,-1)
syms x;
int(1/sin(x)^2*cos(x)^2)
syms x z;
int(x/(1+z^2),x)
A=
A =
1 2 3
4 5 6
7 8 9
10 11 12
B=;
A*B
A^3//错误，矩阵的幂必须矩阵的行列相同才行
rref(A)
x=linspace(0,2*pi,30);
y=sin(x);
z=cos(x);
plot(x,y,'r',x,z,'pg')
x=linspace(0,2*pi,30);
y=sin(x);
z=cos(x);
xlabel('自变量x')
ylabel('函数y')
title('示意图')
plot(x,y,'r',x,z,'pg'),grid on;
x=linspace(0,2*pi,30);
y=sin(x);
z=cos(x);
plot(x,z,'pg');
hold on;
plot(x,y,'r')
x=linspace(0,2*pi,100);
y=sin(x);
z=cos(x);
plot(x,y);
title('sin(x)')
pause;
figure(2);
plot(x,z,'pg');
title('cos(x)')
x=linspace(0,2*pi,30);
y=sin(x);
plot(x,y,'r');
zoom on
p=;
r=roots(p)//次数小于等于4，若大于4则用该命令不一定能求出所有根的准确形式。
r=solve('x^3-4*x^2+9*x-10=0')//简单方法
r=solve('x^2-a*x-4*b=0','x')
d=solve('p*sin(x)-r','x')
r=fzero('x-(cos(x))^2',1)//其中必须输入的是方程对应的函数名
=solve('x+y=1','x-11*y=5','x','y') hahahahahahhahahahhao a hao a ahaoahhahahahhahahhahahah hahahahahahhaaaaaaaaaaaa hahahahahahhaaaaaaaaaaaa 2# mrx
谢谢啊！！ 2# mrx
太感谢了 2# mrx
最近在做有关促销的文章，可以借鉴，３Ｑ Thanks you~~
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