MATLAB vectorization: extracting vector of struct fields from vector of structs

Question

I have a vector S of structs s, each struct having a field x.

I would like to extract the vector X containing the value x from each struct in S.

Is there a way to do this with vectorization?

Example:

s1.x = 42;
s2.x = 87;
s3.x = 24;

S = [s1, s2, s3];

I want to get:

X = [42, 87, 24]

@Benoit_11 Brilliant, please submit it as an answer so I can accept it. I had tried S.x but was missing the enclosing square brackets. — MGA
– MGA, Commented Feb 20, 2015 at 19:19
Alright haha glad it worked! I'l add a bit more details then :) — Ben
– Ben, Commented Feb 20, 2015 at 19:21

Ben · Accepted Answer · 2015-02-20 19:25:30Z

2

You can use square brackets to concatenate the content of the field x of the structure as follows:

X = [S.x]

which puts every data associated with the field x in a single array.

You could also use the cat function to concatenate horizontally:

X = cat(2,S.x)

answered Feb 20, 2015 at 19:25

Ben

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2 Comments

MGA Over a year ago

I'm going to be cheeky and ask if you also know how to do the reverse, i.e. given X, set all s.x in S respectively. I tried [S.x] = X but I get "too many output arguments".

Ben Over a year ago

I think the function deal is what you need: S.x = deal(X). Is that the case?

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