What is the difference between structure and table?
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For me, they looks very similar. I'm not sure when I should use table or structure.
Structure
Table
采纳的回答
Walter Roberson
2018-10-20
编辑：Walter Roberson
2019-12-12
table has a nicer output presentation, and should be more efficient in memory. It also has some useful operations especially when you start getting into timetable objects.
table makes it easier to select subsets of the data. For example you might want to select the excitation and fft of all the entries on a particular date. With struct you would do something like construct mask to select particular structure entries and then do
out = struct('excitation', S(mask).excitation, 'fft', S(mask).fft);
Whereas with tables it would be
out = T(mask, {'excitation', 'fft'}) ;
Or
out = T(mask, [4,7]);
However, table are slower than structures.
2 个评论
Francesco Giuseppe Fornari
2019-12-12
Hi,
What's the meaning of this command you wrote? is mask a table variable?
Thanks
Walter Roberson
2019-12-12
mask here is either a logical vector or a vector of indices, that you have constructed before this according to which entries you wish to select. For example,
now = datetime('now');
dates = [S.date];
mask = dates >= now - days(31);
out = struct('excitation', S(mask).excitation, 'fft', S(mask).fft);
or for tables,
now = datetime('now');
mask = T.dates >= now - days(31);
out = T(mask, {'excitation', 'fft'});
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