mu = A * sin(2pif*t);
时间: 2023-11-14 22:37:24 浏览: 33
This is an equation for a sinusoidal wave where mu represents the amplitude of the wave, A represents the maximum amplitude, f represents the frequency in Hz, t represents time in seconds, and pi is a mathematical constant equal to approximately 3.14159. The equation indicates that the wave is a sine wave, with the amplitude changing according to the sine function as time passes.
相关问题
运用牛顿二元迭代法在Matlab求解theta1和theta2,u1=(ptheta1+roucos(lambadab)-z)/sin(lambadab) u2=(ptheta2+roucos(lambadab)+z)/sin(lambadab) rbcos(theta1+mu)+u1cos(lambadab)sin(theta1+mu)+rousin(lambadab)sin(theta1+mu)==rbcos(theta2+mu)+u2cos(lambadab)sin(theta2+mu)+rousin(lambadab)sin(theta2+mu); rbcos(theta1+mu)-u1cos(lambadab)cos(theta1+mu)-rousin(lambadab)sin(theta1+mu)==-rbsin(theta2+mu)+u2*cos(lambadab)cos(theta2+mu)+rousin(lambadab)*cos(theta2+mu);
以下是使用牛顿二元迭代法在MATLAB中求解theta1和theta2的代码示例:
```matlab
% 初始化参数
theta1 = 0;
theta2 = 0;
max_iter = 100;
tolerance = 1e-6;
% 迭代求解
for i = 1:max_iter
% 计算u1和u2
u1 = (p*theta1 + rou*cos(lambadab) - z) / sin(lambadab);
u2 = (p*theta2 + rou*cos(lambadab) + z) / sin(lambadab);
% 计算雅克比矩阵
J = [rb*cos(theta1+mu)+u1*cos(lambadab)*sin(theta1+mu)+rou*sin(lambadab)*sin(theta1+mu), -rb*cos(theta2+mu)-u2*cos(lambadab)*sin(theta2+mu)-rou*sin(lambadab)*sin(theta2+mu);
rb*cos(theta1+mu)-u1*cos(lambadab)*cos(theta1+mu)-rou*sin(lambadab)*sin(theta1+mu), -rb*sin(theta2+mu)+u2*cos(lambadab)*cos(theta2+mu)+rou*sin(lambadab)*cos(theta2+mu)];
% 计算函数值
f = [rb*cos(theta1+mu)+u1*cos(lambadab)*sin(theta1+mu)+rou*sin(lambadab)*sin(theta1+mu) - rb*cos(theta2+mu)-u2*cos(lambadab)*sin(theta2+mu)-rou*sin(lambadab)*sin(theta2+mu);
rb*cos(theta1+mu)-u1*cos(lambadab)*cos(theta1+mu)-rou*sin(lambadab)*sin(theta1+mu) + rb*sin(theta2+mu)-u2*cos(lambadab)*cos(theta2+mu)+rou*sin(lambadab)*cos(theta2+mu)];
% 计算更新量
delta = -J\f;
% 更新theta1和theta2
theta1 = theta1 + delta(1);
theta2 = theta2 + delta(2);
% 判断是否收敛
if norm(delta) < tolerance
break;
end
end
% 输出结果
fprintf('theta1 = %f\n', theta1);
fprintf('theta2 = %f\n', theta2);
```
需要注意的是,以上代码中的参数p、rou、z、lambadab、mu和rb应该在代码中定义并进行赋值。另外,这里的迭代次数max_iter和误差容限tolerance也可以根据实际情况进行调整。
%input parameters: R=32%Microns n1=1.37 n2=1.27 CA=71 %degrees inputAngle=30 %degrees gridLinesOn=true %Calculation Resolution: dAngle=0.005 %radians wavelengths=linspace(0.3, 0.800, 50); %microns %------------------------------------------------------ thetaOut=[0:dAngle:pi/2]; phiOut=[0:dAngle:pi*2]; %Primary calculation: it should be noted that this calculation takes into %acocunt refraction from n1 medium to air. outMap=Intensity_3D(wavelengths, thetaOut, phiOut, R, CA, inputAngle, n1, n2); %% C=IntensityToColor(wavelengths, outMap); %image(C); C_sphere=sphericalProjection( C, thetaOut, phiOut ); %Output image: figure image([-1, 1], [-1, 1], C_sphere) hold on title(['\theta:', num2str(inputAngle), '^o, R:', num2str(R), '\mu m \eta: ', num2str(CA), '^o' ]) axis image axis off t=linspace(0, 2*pi); plot(cos(t), sin(t), 'w', 'linewidth', 1) if (gridLinesOn) %phi: for p=0:pi/4:pi plot([cos(p), -cos(p)], [sin(p), -sin(p)], 'w', 'linewidth', 1) hold on end % theta: for thetaWhite=[pi/8:pi/8:pi/2]; plot(sin(thetaWhite)*cos(t), sin(thetaWhite)*sin(t), 'w', 'linewidth', 1) end end怎么理解
这段代码是一个 MATLAB 语言的程序,主要用于计算一个球形物体的光强分布,并进行可视化。程序中的各个变量含义如下:
- R:球体半径,单位为微米;
- n1、n2:入射光线所在介质和球体内介质的折射率;
- CA:球体表面的接触角,单位为度;
- inputAngle:入射光线与球体表面法线的夹角,单位为度;
- dAngle:计算球体表面上采样点的角度间隔,单位为弧度;
- wavelengths:计算光强分布的波长范围,单位为微米;
- thetaOut、phiOut:球面坐标系下的采样点角度范围,用于计算球面上每个采样点的光强;
- outMap:计算得到的球面上每个采样点的光强值;
- C、C_sphere:将光强值转化为颜色,用于可视化球体上每个采样点的光强分布;
- t:用于绘制球面上的圆形边界;
- gridLinesOn:控制是否绘制网格线。如果为 true,则绘制球面上的经线和纬线。
程序主要分为三个部分:
1. 计算球面上每个采样点的光强分布:
使用 Intensity_3D 函数计算球面上每个采样点的光强分布,该函数的输入参数为波长、采样点的极角和方位角、球体半径、接触角、入射光线的夹角和介质的折射率。注意,该函数内部已经考虑了光线的折射现象。
2. 可视化球面上每个采样点的光强分布:
将计算得到的光强分布转化为颜色,并使用 sphericalProjection 函数将颜色映射到球面上。最后,使用 image 函数和 plot 函数将可视化结果显示出来。具体来说,image 函数用于在二维平面上显示球面上每个采样点的颜色,plot 函数用于绘制球面的圆形边界和网格线(如果需要)。
3. 绘制球面上的网格线:
如果 gridLinesOn 为 true,则绘制球面上的经线和纬线。具体来说,使用 for 循环分别绘制经线和纬线。经线的范围为 0 到 2π,每隔 π/4 绘制一条经线;纬线的范围为 0 到 π/2,每隔 π/8 绘制一条纬线。