MATLAB: Vertically concatenate struct values from the same field

MATLABstructstructfun

Hi I encountered an issue in vertically concatenation of struct values from the same field. e.g. given S1

[S1(1:10).vals] = deal([1,2,3])

what I want to achieve is to extract all values from the field 'vals' of struct 'S1'. I could do it in a for loop so that

t= [];
for i = 1: 10
    t = [t;S1(i).vals];
end

Since such commands appears frequently, is there a neater code for this purposes using structfun?

Any suggestion would be appreciated!

V = vertcat(S1.vals)
V = vertcat(S1(1:10).vals)

Your example concatenates horizontally because it is exactly equivalent to doing this:

[structure(1).field,structure(2).field]

which is just shorthand for

horzcat(structure(1).field,structure(2).field)

If you want to concatenate vertically, use either of these

vertcat(structure.field)
cat(1,structure.field)

For more information on how to use comma-separated lists:

See vertcat(). Run this example

s1(1).a = [1 2 3];
s1(2).a = [4 5 6; 7 8 9];
s1(3).a = [1 2 3; 4 5 6; 7 8 9];
vertcat(s1.a)

Result

ans =
     1     2     3
     4     5     6
     7     8     9
     1     2     3
     4     5     6
     7     8     9