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Empty for loop matrix

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Maya Lewis
Maya Lewis 2020-12-14
评论： Jan 2020-12-14
Hi there, I'm trying to make a for loop matrix for 90th percentiles of winter rainfall data from a NetCDF file. The code that I have written produces an empty matrix.
fname=[diri fili_1];
fname=fname(~isspace(fname));
prate = single(ncread(fname,'pr'));
TIME=ncread(fname,'time');
TIME2 = double(TIME)/24 + datenum('1970-01-01 00:00:00');
TIME3=datestr(TIME2,0);
dates =datevec(TIME3);
months=dates(:,2);
select_month = dates(:,2)==1 | dates(:,2)==2 | dates(:,2)==12;
winter_precipitation = prate(select_month,:);
%Create a for loop for the graph
mat = winter_precipitation;
startyear = 1981:1999;
endyear = 1982:2000;
nyrs=length(startyear);
P=90;
pmat=zeros(nyrs,12);
for iyr = 1:nyrs
k=find(mat(:,1)>=startyear(iyr) & mat(:,1)<=endyear(iyr));
delmat=mat(k,:);
pmat(iyr,:)=prctile(delmat,P,1);
end
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Maya Lewis
Maya Lewis 2020-12-14
So when I run the code, I want a matrix full of rainfall values, from pmat. What I get instead is NaN in every position.
Soryr I've been working on it so long I've forgotten nobody else knows what I'm doing ahah.
Jan
Jan 2020-12-14
I know this problem. Questions for clarifications are a standard step in solving problems :-)

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回答（1 个）

Matt J
Matt J 2020-12-14
I would rewrite the loop as follows,
for iyr = 1:nyrs
k= mat(:,1)>=startyear(iyr) & mat(:,1)<=endyear(iyr);
if ~any(k),
error 'No data satisifes the condition'
end
delmat=mat(k,:);
pmat(iyr,:)=prctile(delmat,P,1);
end

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