Variable names in loop?

Question

sujit 2015-3-31

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评论： sujit 2015-4-19

Hey, I am trying to extract some environmental parameter measurements from netcdf format file and importing them to an excel file. Here is my code:

fullname={'india-20140101-ssrd-run00.nc'};
Varname='var169';
vardata=ncread(fullname,Varname);
i=1;
while i<26
sheet=i;
filename='india-20140101-ssrd-run00.xlsx';
   xlRange='B4:IH244';
   xlswrite(
    filename,vardata(:,:,i),sheet,xlRange);
    i=i+1;
    end;

I have to read data from several files with names:

india-20140102-ssrd-run00.nc india-20140103-ssrd-run00.nc india-20140104-ssrd-run00.nc india-20140105-ssrd-run00.nc . . .

Is it possible to employ a loop here?

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Answer 1

Chad Greene 2015-3-31

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There are a couple of ways you can do this. One way is to populate a list of names manually before starting the loop:

filenames = {'my file 1'; 'my other file'; 'somebody else''s file'}; 
for k = 1:length(filenames) 
    disp(filenames{k}) 
end

Or if you're only incrementing numbers you can do it like this:

for k = 10:13 
    fullname = ['myfilenumber_',num2str(k),'.nc']; 
    disp(fullname)
end

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Chad Greene 2015-3-31

That's awesome, Stephen!

sujit 2015-4-19

Thank you Stephen..

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Answer 2

Brendan Hamm 2015-3-31

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Sure there are multiple ways to do this.

1. Assuming all of the files are in the same directory (I assume the working) we can use the command:

fileList = dir('india-*'); % Returns a struct with info on the files that begin with 'india-'
fileNames = {fileList.name}; % Extract the file names into a cell array; 
for k = 1:length(fileNames)
    xlsread(fileNames{k},...); % Fill in the rest here
    % Perform more operations here
end