Why do I keep getting this error?

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Lala0099 2019-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/449710-why-do-i-keep-getting-this-error

编辑： Adam Danz 2019-3-25

The error message is :

Error using line

Vectors must be the same length.

Error in filter_and_star_and_final (line 37)

line([t(t_startx), t(t_startx)], ylim, 'Color', 'r', 'LineWidth', 2); % Put a red line there.

I have attache my code and the file that I am trying to use.

I would appreciate any help

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回答（1 个）

Adam Danz 2019-3-12

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My guess is that ylim produces a [1 by 2] vector but [t(t_startx), t(t_startx)] does not produce a [1 by 2] vector.

If that's the case,

timePoint2 = FindTimePoint2(x);   % I bet timePoint2 has more than 1 value!
t_startx= timePoint2;

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Adam Danz 2019-3-13

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Just so I understand, you're saying that alll of the following code is executed except for the line with the "*********" ?

%function output = myfunction(input)
function timePoint2 = FindTimePoint2(signal)
	% Define timepoint1, where the signal is known to be stable.
	timePoint1 = 70; % Index, not absolute time.
	% Find the mean and standard deviation in the first fifty samples.
	meanSignal = mean(signal(1:timePoint1));
	sdSignal = std(signal(1:timePoint1));
	% Find where the signal deviates from the mean the most.
	meanDeviationFromMean = abs(signal - meanSignal);
	[maxDeviation, timePoint3] = max(meanDeviationFromMean);       % *********
	timePoint3 = find(meanDeviationFromMean > 10*sdSignal);
	% Find the last place in the signal, between timePoint1 and timePoint3
	% where the signal equals the mean.  This will be timePoint2.
	signal2 = signal; % Make copy.
	% Make signal mean before timePoint1 and after timePoint3 so we will
	% find the timePoint2 only within that section.
	signal2(1 : timePoint1) = meanSignal;
	signal2(timePoint3 + 1 : end) = meanSignal;
	% Now find timePoint2
	timePoint2 = find(meanDeviationFromMean(1:timePoint3) <= 6*sdSignal, 1, 'last');
end