how can i return array range using histogram?

5 vues (au cours des 30 derniers jours)
Joseph
Joseph le 22 Juil 2015
Commenté : dpb le 23 Juil 2015
i have a Netcdf file including latitude(30619x1), altitude(150), N2O(150x30619) and other information. i have made a histogram using below code:
clc;
clear all;
ncdisp('ACEFTS_v3p5_N2O.nc')
T = ncread('ACEFTS_v3p5_N2O.nc','N2O',[1 1], [Inf Inf], [1 1]);
alt= ncread('ACEFTS_v3p5_N2O.nc','altitude',[1], [Inf], [1]);
lat= ncread('ACEFTS_v3p5_N2O.nc','latitude',[1],[Inf], [1]);
flag= ncread('ACEFTS_v3p5_N2O.nc','quality flag',[1 1], [Inf Inf], [1 1]);
er=ncread('ACEFTS_v3p5_N2O.nc','N2O error',[1 1], [Inf Inf], [1 1]);
fclose('all')
lat_inrange_1 = lat >= 15 & lat < 26; %watch the edge conditions!
lat_inrange_2 = lat >= 41 & lat < 46; %watch the edge conditions!
lat_inrange_3 = lat >= 71 & lat < 81;
lat_inrange = lat_inrange_1 | lat_inrange_2|lat_inrange_3;
T_1 = T(:,lat_inrange);
% latbin=(15:5:80);
latbin_1 =(15:5:26);
latbin_2=(41:5:46);
latbin_3=(65:5:70);
latbin_4=(71:5:81);
binedges = datenum(latbin_1:latbin_2:latbin_3:latbin_4);
[~,L] = histc(lat,binedges);
now i want to return the latitude range based on L. how can i do that?
thank you

Réponses (1)

dpb
dpb le 22 Juil 2015
Can't (at least if you mean by "range" the max/min difference of observed values in the data vector); the second return value from histc only tells you which bin each element of the vector belongs to; you would still have to search within it excepting as a indirect search instead of directly. Don't try to be cute, just write
latRnge=max(lat)-min(lat);
or whatever it is that is your definition if that isn't it.
  2 commentaires
Joseph
Joseph le 22 Juil 2015
Modifié(e) : Joseph le 22 Juil 2015
i am simply asking that i have a histogram of an array x, and now i want to know,according to the binedge in the histogram (for example in my case L(30619x1) Lmin=0 Lmax =62), how can i figure out lets say L(45) belongs to what latitude value. if you don't know the answer you don't have to answer.
dpb
dpb le 23 Juil 2015
That'd be the L(45) value; the bin in which the 45th element went. The magnitude of that bin would be between the two edges in the edges vector of that value:value+1. That is, if it were to be 8, say, it would be between edges(8:9)

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