How to ignore nan values in using trapz function
94 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Bijay Guha
el 13 de Feb. de 2018
Hello.. I have two column matrix one is height another one is data, both are of same sizes. But both includes some NaN values.
height=[NaN;NaN;NaN;0.246;1.252;2.253;3.2470;4.228;5.192;6.139;7.072];
data=[NaN;NaN;NaN;NaN;NaN;0.0014428;0.0018342;0.0019822;0.0017613;0.0013172;NaN];
I want to integrate the data with respect to height, but as expected it gives NaN output, as the data contains NaN values. Actually the number of NaN is varying for different sets. So can anyone help in general way to omit this NaN element in using trapz function (just like nanmean, nansum, nanstd etc). Extrapolation will give error in my case, so I need answer without extrapolation. Any answer will be helpful. Thanks in advance
0 comentarios
Respuesta aceptada
Birdman
el 13 de Feb. de 2018
Editada: Birdman
el 13 de Feb. de 2018
Before evaluation, you can get rid of nans as follows:
height=height(~isnan(height))
data=data(~isnan(data))
7 comentarios
Luis
el 1 de Abr. de 2024
Editada: Luis
el 1 de Abr. de 2024
Even the following is still wrong, as it adds erroneous area where the ~nan segments are joined together:
dataNans = isnan(Data); heightNans = isnan(Height);
useIndicees = ~dataNans & ~heightNans
trapz(Data(useIndicees),Height(useIndicees))
(Consider e.g. integrating the area of a wall where x=data is along width, and nan's in y=height signify gaps in the wall. I won't show my ugly code here to take care of that, but may be you can come up with something elegant.)
Más respuestas (0)
Ver también
Categorías
Más información sobre Numerical Integration and Differentiation en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!