www.gusucode.com > matlab 案例源码 matlab代码程序 > matlab/ReadDataInTabularTextDatastoreExample.m

    %% Read Data in TabularTextDatastore
%%
% Create a datastore from the sample file, |airlinesmall.csv|, which
% contains tabular data. 
ds = tabularTextDatastore('airlinesmall.csv','TreatAsMissing','NA','MissingValue',0);
%%
% Modify the |SelectedVariableNames| property
% to specify the variables of interest.
ds.SelectedVariableNames = {'DepTime','ArrTime','ActualElapsedTime'};

%%
% While there is data available to be read from the datastore, read one
% block of data at a time and analyze the data. In this example, sum the
% actual elapsed time.
sumElapsedTime = 0;
while hasdata(ds)
    T = read(ds);
    sumElapsedTime = sumElapsedTime + sum(T.ActualElapsedTime);
end
%%
% View the sum of the actual elapsed time.
sumElapsedTime