矩阵错误'Subscript indices must either be real positive integers or logicals.'

Question

我是 matlab 的新手，matlab 在代码段的最后一行给出错误"下标索引必须是实正整数或逻辑"（如果 th<0.01 || rank（A'*A）~=2） 如下所示，请指导我：

function [u,v] = optical_flow( im1,im2,windowSize )
x_c=im1(1:end-1,2:end)-im2(1:end-1,1:end-1);%(define rows 1~479,2~639 columns)-(rows 1~479,1~639)
y_c=im2(2:end,1:end-1)-im1(1:end-1,1:end-1);
t_c=im2(1:end-1,1:end-1)-im1(1:end-1,1:end-1);
%initialize for speed
u = zeros(size(x_c));
v = u;
for x = 1:size(x_c,1)-windowSize %fpr all x
    for y = 1:size(x_c,2)-windowSize
        %Get the windows of the dimensions
        win_x=imcrop(x_c,[x y windowSize windowSize]);
        win_y=imcrop(y_c,[x y windowSize windowSize]);
        win_t=imcrop(t_c,[x y windowSize windowSize]);
        %Convert windows to vectors to produce A for solving later
        A = [win_x(:) win_y(:)];
        %Compute threshold t (smallest eigenvalue of A'A)
        th=min(eig(A'*A));
        %Optical flow is only valid in regions with t<0.01 and
        rank =2;
        %if true, then it should not be computed
        if th<0.01 || rank(A'*A)~=2

Answer 1

你给rank赋值，这意味着 MATLAB 现在rank视为变量。稍后，当您尝试计算rank(A'*A)时，您将rank视为函数。您应该重命名rank变量。

    %Optical flow is only valid in regions with t<0.01 and
    rank =2; % <--- RENAME THIS
    %if true, then it should not be computed