Question

我有一个函数plot_result()，它根据测试从结果中绘制条形图。我有两个向量：

R = [0 1 1 -1] containing logical true or false from the questions. and
T = [0 1 2 3] containing time spent on each questions.

0 - in R means a question not answered

如果答案为1，则栏为绿色，否则为红色。但传说显示的不是预期。

在上述情况下R和T 传奇节目：

Green - "Right answer"
Green - "Right answer"

而不是

Green - "Right answer"
Red   - "Wrong answer"

有时它也显示3个传说而不是2个 - 我做错了什么？

R = [0 1 1 -1];
T = [0 1 2 3];


if sum(T) ~= 0 

% Barchart
figure;
for i=1:length(T)
    h(i) = bar(i, T(i));
       if i == 1 hold on, end
          if R(i) == -1 
             col = 'r';
             legendInfo{i} = ['Wrong Answer '];
          else
             col = 'g';
             legendInfo{i} = ['Right Answer '];
          end

       set(h(i), 'FaceColor', col)
       end
   end

         set(gca,'xTick',1:length(R),'xTickLabel',1:length(R))
         xlabel('Answer No..');
         ylabel('Time per. question')
         title('Question vs. time')
         set(gca,'YLim',[0 max(T)])

         [~,legendsIWant]=unique(nonzeros(R)); 
         legend(h(legendsIWant),legendInfo(legendsIWant),'Location', 'BestOutside'   'FontSize', 8);

Answer 1

给定输入的问题是[~,legendsIWant]=unique(nonzeros(R))将给出与非零（R）对应的索引值而不是R

可能的解决方法是获取所有唯一值的位置，然后丢弃任何对应的零例如替换

中提到的行

[uniqueValues,legendsIWant]=unique(R)
legendsIWant=legendsIWant(uniqueValues~=0)

Matlab，条形图和传说

1 个答案: