question about the 'stuct' of matlab?

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Ray Lee
Ray Lee 2014-11-24
评论： Ray Lee 2014-11-26
Why the second one gives rise to empty struct?
s.a=1; s.b=2; s.c={}
s =
a: 1
b: 2
c: {}
s = struct('a',1,'b',2,'c',{})
s =
0x0 struct array with fields:
a
b
c

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per isakson
per isakson 2014-11-24
编辑：per isakson 2014-11-24
That's the way the function struct is designed to work. See struct, Create structure array "[...]If value is an empty cell array {}, then s is an empty (0-by-0) structure."
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Guillaume
Guillaume 2014-11-24
编辑：Guillaume 2014-11-24
If you do want to assign an empty cell array to a field of a structure using the struct function, you need to wrap that empty cell array into a cell array:
s = struct('a', 1, 'b', 2, 'c', {{}})
s =
a: 1
b: 2
c: {}
For that matter, even if the cell array is not empty you still need to wrap it to assign it to a scalar structure, otherwise the elements of the cell arrays are just distributed over an array of structs.
Ray Lee
Ray Lee 2014-11-26
good solution.
in my code, I checked if s.c is empty. if not, the code makes some processing using the parameters in s.c

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