Retrieve the time that a certain value is reached within a time series.

Question

jake Hawley 2016-1-12

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回答： Israel Vargas 2019-1-13

I am running a Simulink model and am changing constant to see how the system responds. I want to know what time the system reaches a certain value at each of the constants. I have same the time series to the work space but can not figure out how to extract the time at which the value becomes true.

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Answer 1

goerk 2016-1-12

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在 MATLAB Online 中打开

A simple way is to extract the data and the time as arrays

% create example data 
d=1:100;
t=d/100;
ts = timeseries(d,t);
% define threshold
thr = 55;
data = ts.data(:);
time = ts.time(:);
ind = find(data>thr,1,'first');
time(ind) %time where data>threshold

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jake Hawley 2016-1-12

Figured it out, the value i was looking for ended up being the max value so the vector never became greater than it so i needed to turn

ind = find(data>thr,1,'first');

to

ind = find(data=>thr,1,'first');

Ryan Wang 2018-8-20

Thank you so much goerk. This answer is truly helpful!

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Answer 2

Israel Vargas 2019-1-13

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Hi, excelent way to find a value in vectors. I'm doing something similar. While I'm running the simulation (in real time) I would like to get the especific time when a diferent signal change to a especific value. I have tried to edit what your writed but with bad results. I suppose because the dimentions of the time and the voltage signals are changing while the simulation is running. Please help me!