How to create dummy variable?
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi all, I have a data matrix of dimension 100x5(time series) I have an outlier for the 75th value of the 4th column so I decide to construct a dummy variable for this outlier.
How can I do this?
Thanks in advance for your consideration and any help
1 commentaire
Muthu Annamalai
le 17 Juil 2013
Your question is not clear enough.
Do you want to find NaN values from your data? isnan maybe something you are interested in, to help pick NaN from data.
What is a 'dummy variable' ? Do you want to replace,
A(75,4) = 0 ; %eliminate the outlier ?
Réponse acceptée
Iain
le 17 Juil 2013
Use the mean of the two "surrounding" points
A(75,4) = A(74,4) + A(76,4);
Fit a curve to the known points, and then evaluate it at that point: (or interpolate...)
p = polyfit(times([1:74 76:end]),A([1:74 76:end],4),4); A(75,4) = polyval(p,times(75)); & That uses a 4th order polynomial
0 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Interpolation dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!