accessing multiple individual struct field values
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I have made a structure like so;
xfr = struct('name',[],'sn',zeros(tmp,1),'xs',zeros(tmp,1),'f',[],'amp',[],'unphas',[],'lincoh',[]);
and filled the fields amp,unphas, and lincoh with 4 double values. xfr is 1x15. I need to make a scatter plot of one field vs the first value of unphas [unphas(1)]
I can easily extract all of the xs values: xfr.xs
How can I extract the first (or second, third, or fourth) value of unphas for all xfr ?
I have tried many different ways without success
a = [xfr(1:15).unphas(4)]
Expected one output from a curly brace or dot indexing
expression, but there were 15 results.
回答（1 个）
S(1).data = [1;2;3];
S(2).data = [4;5;6];
S(3).data = [7;8;9];
n = 2;
V = arrayfun(@(s)s.data(n),S)
or (assuming that each field contains a column vector):
M = [S.data];
V = M(2,:)
2 个评论
Darren Reed
2021-5-20
Stephen23
2021-5-21
The arrayfun approach does not assume anything about the orientation or size of the array. Try that first.
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2021-5-20
2021-5-21
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