Adding Horizontal (error) lines to a plot

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Joseph Moon
Joseph Moon 2017-7-24
评论： Star Strider 2017-7-26
I have a plot (plot(e)) which shows displacement of 3 different positions (this plots well). I am trying to add horizontal error lines when the max value for each position is => 0.05%. However, I am unable to figure out how to have the error lines appear within my plot.
allData = xlsread('FILE NAME'); % File Directory (.xls)
ay = allData(:,3); % y array of hip
a1 = allData(1,3); % first cell of y array of hip
a2 = a1+(a1*0.05); % 0.05% error line
by = allData(:,4); % y array of knee
b1 = allData(1,4); % first cell of y array of knee
b2 = b1+(b1*0.05); % 0.05% error line
cy = allData(:,5); % y array of foot
c1 = allData(1,5); % first cell of y array of foot
c2 = c1+(c1*0.05); % 0.05% error line
e = [ay,by,cy];
if max(ay) >= a2 % Position greater than 0.05% error (a2)
plot( [a2(1) a2(end)], 'r'); % error reference line
elseif max(by) >= b2 % Position greater than 0.05% error (a2)
plot( [b2(1) b2(end)], 'r'); % error reference line
elseif max(cy) >= c2 % Position greater than 0.05% error (a2)
plot( [c2(1) c2(end)], 'r'); % error reference line
end
plot(e)
title('Sway (Backswing)');
ylabel('Position (mm)');
xlabel('Time (ms)');
legend('Hip', 'Knee', 'Foot');

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回答（1 个）

Star Strider
Star Strider 2017-7-24
I don’t have your data file, so I can’t run your code.
I’m not certain what you intend with your plot statements. See if something like this works:
plot(xlim, [a2(1) a2(end)], 'r') % error reference line
Note that xlim is a (1 x 2) vector of the x-axis limits, so although I cannot test it with your data, this should work. It should also work if you re-define the x-axis limits.
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Star Strider
Star Strider 2017-7-26
My pleasure!
If my Answer helped solve your problem, please Accept it!

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