www.gusucode.com > datastoreio工具箱 matlab源码程序 > datastoreio/+matlab/+io/+datastore/@TallDatastore/hasdata.m
function tf = hasdata(tds) %HASDATA Returns true if there is more data in the TallDatastore. % TF = HASDATA(TDS) returns true if there are more key-value pairs % in the TallDatastore TDS, and false otherwise. % read(TDS) returns an error when HASDATA(TDS) returns false. % % Example: % -------- % % Create a simple tall double. % t = tall(rand(500,1)) % % Write to a new folder. % newFolder = fullfile(pwd, 'myTest'); % write(newFolder, t) % % Create an TallDatastore from newFolder % tds = datastore(newFolder) % % while HASDATA(tds) % % read one row of data at a time % a1 = read(tds) % end % % See also matlab.io.datastore.TallDatastore, read, readall, preview, reset. % Copyright 2016 The MathWorks, Inc. try % If data is already buffered, BufferedSize will be > 0 and no need to check % hasNext from the SplitReader tf = tds.BufferedSize > 0 || hasdata@matlab.io.datastore.FileBasedDatastore(tds); catch e throw(e); end end