accessing multiple individual struct field values

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.

Answer 1

[Stephen23]

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)

V = 1×3

2 5 8

or (assuming that each field contains a column vector):

M = [S.data];
V = M(2,:)

V = 1×3

2 5 8

[Darren Reed]

I don't think I have column vectors in the structure xfr.unphas

The data is put into the structure within a double loop as this:

xfr(i).unphas(j) = unphas(mxi+ids(j,1));

Is there any other way to put the data into the xfr.unphas field to make it a column vector?

Thanks

[Stephen23]

The arrayfun approach does not assume anything about the orientation or size of the array. Try that first.