matlab vertically concatenate logical indexed arrays

Question

I Have a 8x18 structure with each cel containing a column vector of occurrences of a single event. I want to obtain data from some of these fields concatenated in a single array, without having to loop through it. I can't seem to find a way to vertically concatenate the fields I am interested in in a single array.

As an example I create the following structure with between 1 and 5 occurrences per cell:

s(62).vector(8,18).heading.occurrences=[1;2;3];
for i=1:62
    for j=1:8
        for k=1:18
            y=ceil(rand(1)*5);
            s(i).vector(j,k).heading.occurrences=rand(y,1);
        end
    end
end

Now i want to obtain all occurrences in several cells while keeping i constant at for instant i=1. What I have tried is:

   %fields of interest
   a=[1 26 45];
   x=[s(1).vector(a).heading.occurrences];

This however yields the error: Expected one output from a curly brace or dot indexing expression, but there were 3 results.

Is there anyone how to do this without having to loop through the whole structure?

Jed · Accepted Answer · 2017-06-16 15:11:17Z

1

Here you go:

ss=s(1).vector([1 26 45]);                     
h=[ss.heading];            
cell2mat({h.occurrences}')

answered Jun 16, 2017 at 15:11

Jed

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3 Comments

Jasper Over a year ago

Works like a charm thank you very much Jed! :) If I would want to do the same for s, for instance s([1 2 3]).vector([1 26 45]), how would that work? I have tried xx=s([1 2 3]), yy=xx.vector([1 26 45]) but that gives me the same error. Is this also possible with a vector operation?

m7913d Over a year ago

@Jasper Please avoid asking a new question as a comment. Either accept this answer and create a new question mentioning your previous related question or edit your question to include all the necessary information to answer your question, but avoid asking multiple distinct questions at once.

Jasper Over a year ago

Excuse me, I am new to this forum. I have updated my question

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