假设四阶矩阵A的相位上下界为[α,β],然后计算A与其他矩阵乘积的相位上下界的matlab函数

以下是一个Matlab函数，可以计算一个四阶矩阵A与其他矩阵B相乘的相位上下界：

function [alpha, beta] = phase_bounds(A, B)
% Calculate the phase bounds of the product of a four-order matrix A and another matrix B.

% Calculate the magnitude and phase of A.
mag_A = abs(A);
phase_A = angle(A);

% Calculate the magnitude and phase of B.
mag_B = abs(B);
phase_B = angle(B);

% Calculate the product of the magnitudes.
mag_prod = mag_A * mag_B;

% Calculate the sum and difference of the phases.
phase_sum = phase_A + phase_B;
phase_diff = phase_A - phase_B;

% Calculate the maximum and minimum of the phase sum and difference.
max_sum = max(phase_sum(:));
min_sum = min(phase_sum(:));
max_diff = max(phase_diff(:));
min_diff = min(phase_diff(:));

% Calculate the phase bounds.
alpha = max(min_sum - max_diff, -pi);
beta = min(max_sum - min_diff, pi);
end

你可以通过调用这个函数并输入矩阵A和其他矩阵B来得到所需的结果。函数返回的是相位上下界α和β。