$P_s=3/2Q(\sqrt{4E_s/(3(N-1))})-9/8Q^2(\sqrt{4E_s/(3(N-1))})$在matlab中如何表示
时间: 2024-03-02 07:51:32 浏览: 41
在MATLAB中,可以使用以下代码表示$P_s=3/2Q(\sqrt{4E_s/(3(N-1))})-9/8Q^2(\sqrt{4E_s/(3(N-1))})$:
```matlab
syms Q N E_s
P_s = 3/2*qfunc(sqrt(4*E_s/(3*(N-1)))) - 9/8*qfunc(sqrt(4*E_s/(3*(N-1))))^2;
```
其中,`syms`用于声明符号变量,`qfunc`表示Q函数。
相关问题
for x_i in x: P_x_w1 = 1 / (std1 * pow(2 * math.pi, 0.5)) * np.exp(-((x_i - mean1) ** 2) / (2 * std1 ** 2)) P_x_w2 = 1 / (std2 * pow(2 * math.pi, 0.5)) * np.exp(-((x_i - mean2) ** 2) / (2 * std2 ** 2)) P_x = P_x_w1 * P_w1 + P_x_w2 * P_w2 P_w1_x = (P_x_w1 * P_w1) / P_x P_w2_x = 1 - P_w1_x if P_w1_x > P_w2_x: data_w1 = np.append(data_w1, x_i) if P_w1_x < P_w2_x: data_w2 = np.append(data_w2, x_i) 转成matlab代码
for i = 1:length(x)
P_x_w1 = 1 / (std1 * sqrt(2 * pi)) * exp(-((x(i) - mean1) ^ 2) / (2 * std1 ^ 2));
P_x_w2 = 1 / (std2 * sqrt(2 * pi)) * exp(-((x(i) - mean2) ^ 2) / (2 * std2 ^ 2));
P_x = P_x_w1 * P_w1 + P_x_w2 * P_w2;
P_w1_x = (P_x_w1 * P_w1) / P_x;
P_w2_x = 1 - P_w1_x;
if P_w1_x > P_w2_x
data_w1 = [data_w1 x(i)];
end
if P_w1_x < P_w2_x
data_w2 = [data_w2 x(i)];
end
end
如何将下边maole中的代码改为matlabfig:=proc(P_x,P_y,P_z,R,mu,varphi,C) with(plots);with(ColorTools); local Rb; local Rf := implicitplot(x^2 + y^2 = R^2, x = -R .. R, y = -R .. 2, color =red, thickness = 2): local s_r:=1/2*(P_x + P_z)*(1 - R^2/r^2) - 1/2*(P_z - P_x)*(1 - 4*R^2/r^2 + 3*R^4/r^4)*cos(2*theta); local s_t:=1/2*(P_x + P_z)*(1 + R^2/r^2) + 1/2*(P_z - P_x)*(1 + 3*R^4/r^4)*cos(2*theta); local s_rt:=1/2*(-P_z + P_x)*(1 + 2*R^2/r^2 - 3*R^4/r^4)*sin(2*theta); local s_y:=P_y - 2*mu*(-P_z + P_x)*R^2*cos(2*theta)/r^2; local s_3:=(s_r + s_t)/2 - sqrt(((s_r - s_t)/2)^2 + s_rt^2); local s_1:=(s_r + s_t)/2 + sqrt(((s_r - s_t)/2)^2 + s_rt^2); local s_2:=s_y; local J2:=(s_1^2+s_2^2+s_3^2-s_1*s_2-s_1*s_3-s_2*s_3)/3; local I1:=s_1+s_2+s_3; local p:=(s_1+s_2+s_3)/3; local J3:=(s_1-p)*(s_2-p)*(s_3-p); local k:=(arcsin((-3*sqrt(3)*J3)/(2*sqrt(J2*J2*J2))))/3; Rb:=implicitplot(I1/3*sin(varphi)+C*cos(varphi)-sqrt(J2)*((1/sqrt(3))*sin(varphi)*sin(k)+cos(k)),r=R..R*20,theta=0..2*Pi,coords=polar,thickness=2); display(Rf,Rb) end proc:
以下是将maole中的代码改为MATLAB的代码,MATLAB中没有ColorTools模块,因此省略相关部分:
```matlab
function matlabfig = proc(P_x, P_y, P_z, R, mu, varphi, C)
syms r theta;
Rf = ezplot(r^2*cos(theta)^2 + r^2*sin(theta)^2 - R^2 == 0, [-R, R, -R, 2]);
set(Rf, 'Color', 'red', 'LineWidth', 2);
s_r = 1/2*(P_x + P_z)*(1 - R^2/r^2) - 1/2*(P_z - P_x)*(1 - 4*R^2/r^2 + 3*R^4/r^4)*cos(2*theta);
s_t = 1/2*(P_x + P_z)*(1 + R^2/r^2) + 1/2*(P_z - P_x)*(1 + 3*R^4/r^4)*cos(2*theta);
s_rt = 1/2*(-P_z + P_x)*(1 + 2*R^2/r^2 - 3*R^4/r^4)*sin(2*theta);
s_y = P_y - 2*mu*(-P_z + P_x)*R^2*cos(2*theta)/r^2;
s_3 = (s_r + s_t)/2 - sqrt(((s_r - s_t)/2)^2 + s_rt^2);
s_1 = (s_r + s_t)/2 + sqrt(((s_r - s_t)/2)^2 + s_rt^2);
s_2 = s_y;
J2 = (s_1^2+s_2^2+s_3^2-s_1*s_2-s_1*s_3-s_2*s_3)/3;
I1 = s_1+s_2+s_3;
p = (s_1+s_2+s_3)/3;
J3 = (s_1-p)*(s_2-p)*(s_3-p);
k = (asin((-3*sqrt(3)*J3)/(2*sqrt(J2^2*J2))))/3;
Rb = ezplot(I1/3*sin(varphi)+C*cos(varphi)-sqrt(J2)*((1/sqrt(3))*sin(varphi)*sin(k)+cos(k)), [R, R*20, 0, 2*pi]);
set(Rb, 'LineWidth', 2);
matlabfig = [Rf, Rb];
end
```