how to get the specific member data from a struct array?
显示 更早的评论
for example,
b=struct('name','JPEG','age','18') ;
c=repmat(b,3,1) ;
d=c.name;
c.name
why is the result of "c.name" different from the result of "d=c.name"?
how to get the member data directly from a struct array or matrix? such as c.name?
and another question, how to create a struct array or matrix directly just like zeros(2,3), but struct(2,3) doesn't work, so how?
采纳的回答
George
2016-11-4
"When you access a field of a nonscalar structure, such as s.f, MATLAB® returns a comma-separated list. In this case, s.f is equivalent to s(1).f, s(2).f, s(3).f."
So your d = c.name is equivalent to
d = c(1).name, c(2).name, c(3).name.
Try
[d,e,f] = c.name
struct(2,3) doesn't work because it's trying to create a 1x1 struct array with field:2 and value:3. Field needs to be a char array.
更多回答（1 个）
Alexandra Harkai
2016-11-4
编辑：Alexandra Harkai
2016-11-4
0 个投票
What c is is what is called a nonscalar struct array. Then "You cannot assign the list to a single variable with the syntax v = s.f because the fields can contain different types of data." as per the Documentation, so variable d gets only c(1).name, and hence they will be different.
2 个评论
Alexandra Harkai
2016-11-7
Please do not change your question once it has been answered, it is preferred to start new one.
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