How do I find the first 30 percent of each period of cosine?
1 visualizzazione (ultimi 30 giorni)
Mostra commenti meno recenti
I want to find and plot points of the graph with the find function to locateeach period of the cosine , how would i go about this?
4 Commenti
Rik
il 10 Set 2021
I recovered the removed content from the Google cache (something which anyone can do). Editing away your question is very rude. Someone spent time reading your question, understanding your issue, figuring out the solution, and writing an answer. Now you repay that kindness by ensuring that the next person with a similar question can't benefit from this answer.
Walter Roberson
il 10 Set 2021
Risposte (2)
Sulaymon Eshkabilov
il 9 Set 2021
Modificato: Sulaymon Eshkabilov
il 9 Set 2021
In this case, if you are working and need to work with your plot, then you should work with ginput to locate where your full period is and then pick up the 30% of the data along x - axis. E.g:
[x, y] = ginput(5); % 5 points catch 4 periods. Click 1 picks up the starting point, click 2 end of 1st period, click 3 the end of 2nd period, etc.
% Then process the slected data with logical indexing (T is your known time signal along x axis):
T1 = T(T>=x(1) & T<=x(2));
T2 = T(T>=x(2) & T<=x(3));
...
% Then you can process the chosen data T1, T2, ... by reselecting only 1/3
% or 30% of it
0 Commenti
Walter Roberson
il 9 Set 2021
look for the places where sign(diff()) of the signal changes from positive to negative. If you do not have noise, then those are the peaks. The difference in indices tells you how long that cycle is, so you can calculate how many points is 30% there. Then you can extract that subset, such as into a cell array.
0 Commenti
Vedere anche
Categorie
Scopri di più su 2-D and 3-D Plots in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!