针对以上问题，是在matlab平台进行，请给出相应代码

在MATLAB中，你可以使用`text`函数来添加线段长度的标注，而计算线段长度需要利用向量差和勾股定理。这里是针对你的需求的一个示例代码：

首先，我们需要一个函数来计算两点之间的欧氏距离，然后计算并存储线段长度以及对应的交点索引对：

function computeSegmentLengths(intersection_points, T)
    % Initialize empty structure to store lengths and indices
    segment_lengths = struct('points', {}, 'lengths', {});

    for k = 1:length(T) - 1
        for j = k + 1:length(T)
            % Get the endpoints of the lines
            line1_start = T(k).point1;
            line1_end = T(k).point2;
            line2_start = T(j).point1;
            line2_end = T(j).point2;

            % Calculate intersection points
            xi = polyxpoly(line1_start(1), line1_start(2), line1_end(1), line1_end(2), line2_start(1), line2_start(2), line2_end(1), line2_end(2));

            % If intersection found
            if ~isempty(xi)
                % Find the index of this intersection point in intersection_points
                intersection_idx = find(intersection_points == [xi(1), xi(2)]);

                % Calculate and store the length of the new segments
                length = norm(line2_end - line1_start);
                segment_lengths(lengths(end)+1).points{end+1} = [intersection_idx, line1_start, line1_end, line2_start, line2_end];  % Store the points
                segment_lengths(lengths(end)+1).lengths(end+1) = length;  % Store the length
            end
        end
    end
    segment_lengths;
end

% 使用函数并假设已经得到了T和intersection_points
computed_segments = computeSegmentLengths(intersection_points, T);

% 现在可以在plot图形时添加线段长度标注
figure;
hold on;
for i = 1:numel(computed_segments.lengths)
    points = computed_segments.points{i};
    line1 = plot(points(1:2), 'LineWidth', 1);
    line2 = plot(points(3:4), 'LineWidth', 1);
    text(mean(points(1:2)), mean(points(3:4)), sprintf('%.2f', computed_segments.lengths(i)), 'HorizontalAlignment', 'center', 'VerticalAlignment', 'middle');
    drawnow;  % 刷新以便立即看到标注
end
hold off;

注意，这个例子假设你已经有了`T`和`intersection_points`，并且它们的格式符合预期。`T`应该是一个包含线段起点和终点的矩阵，而`intersection_points`则是一个存储了交点坐标的列向量。