当我通过你的函数得到了一个人的移动轨迹trajectory，请再写一个matlab函数，输入是轨迹trajectory，和采样时间T，移动速度v；输出是采样坐标向量

function [coordinates] = sampled_coordinates(trajectory, T, v)
% Sample the coordinates based on trajectory, sampling time T, and velocity v
num_points = length(trajectory);
coordinates = zeros(2, num_points);

for i = 1:num_points
if i == 1
coordinates(:,i) = trajectory(:,i); % Starting position
else
distance = norm(trajectory(:,i) - trajectory(:,i-1));
time_diff = distance / v;
num_samples = ceil(time_diff / T);
for j = 1:num_samples
if j == num_samples
time_fraction = 1; % Last sample
else
time_fraction = j * T / time_diff;
end
coordinates(:,i) = trajectory(:,i-1) + (trajectory(:,i) - trajectory(:,i-1)) * time_fraction;
end
end
end

end