get the correct data of intersection in plot

Question

Jacco vD 2016-8-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/298566-get-the-correct-data-of-intersection-in-plot

回答： Jacco vD 2016-8-15

Hi, I'm working on a project in which i want to know the time on which the accuracy lines hit 95% for the first time. I've already looked in some related topics but didn't find any that could help me on it.

Although the figure below contains two sets of lines only the accuracy ones are of importance.

below a simplified representation of the code for this graph.

frequencies  = [7.5 15 30 60 120 240];
nfrequencies = numel(frequencies);
duration     = 0.2:0.2:8.5;
for a=1:nfrequencies
    accuracy(:,a)=(a+2)*(a+2.5)*duration+10;
    ltext{a}=[num2str(frequencies(a)), 'Hz'];
end
plot(duration,accuracy)
axis([0.2 8.5 0 102])
legend(ltext,'Location','southeast');

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Jacco vD 2016-8-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/298566-get-the-correct-data-of-intersection-in-plot#answer_231812

在 MATLAB Online 中打开

none of those seem to work this case.

So I fixed it simply like this. It gives me the first time that the accuracy of a given frequency is 95%, which is what in need;)

duration      = 0.2:0.2:8
nfrequencies  = 6
threshold     = accuracy*100>=95;
X             = zeros(nfrequencies,1)
for l=1:nfrequencies
    fthreshold = find(threshold(:,l));
      if fthreshold >= 1
          Y = duration(fthreshold(1));
      else
          Y = max(duration);
      end
          X(:,l)= Y;
end