Units for define max, min and sampling frequency
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I have been using a bandpass for my netcdf data, to have 30-80 day frequency.
Although Ive noticed until now that maybe Ive been putting the frequencies in the incorrect units:
frecuencia_min = 1 / 80; % Min frequency (cycle/day)
frecuencia_max = 1 / 30; % Max frequency (cycle/day)
% olr having 180x51x136, but for only an example olr has 1x1x136, being the
% last one the time dimension
olr_real(1,1,:) = bandpass(squeeze(olr_1(1,1,:)),[frecuencia_min frecuencia_max],1); % data is daily so fs=1
Are the units correct for the three frequencies?
Thanks! :)
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William Rose
2023-9-13
You call bandpass() as folows:
frecuencia_min = 1 / 80; % Min frequency (cycle/day)
frecuencia_max = 1 / 30; % Max frequency (cycle/day)
yfilt=bandpass(y,[frecuencia_min frecuencia_max],1);
This specifies that the sampling rate is 1 sample per unit time, and the filter cutoff frequencies are frecuencia_min and frecuencia_max cycles per unit time.
Therefore, if your data are sampled at 1 per day, then your cutoff frequencies are correctly specified.
2 个评论
Luis Jesús Olvera Lazcano
2023-9-13
William Rose
2023-9-13
@Luis Jesús Olvera Lazcano, that looks good to me. I assume you have initialized olr_real with a command suich as below.
olr_real=zeros(size(olr_1)); % initialize olr_real
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