select items from a struct array matlab- based on condition

Question

I have a struct array named Lst. Every struct has the following form:

Point (x,y)
Type (1-6)

I want get the separate array of points for each type. How can I get it?

Lst(Lst.Type==1);

won't work since Type is not a field of Lst but of Lst(i).

In addition, is there a way to save the indexes of each item or an alternative way to then combine them again to the original order?

s.bandara · Accepted Answer · 2014-02-23 21:46:50Z

7

L1 = Lst([Lst.Type]==1); will give you the subset L1 of Lst where Type == 1.

Likewise, you can use idx1 = find([Lst.Type]==1) to memorize your indexes.

EDIT: the above uses the [] operator to aggregate the field elements Type of Lst into an array. To your comment/question, you could use the exact same operator also to obtain an array of specific field elements X of a subset of the structured array, as in

X1 = [Lst([Lst.Type]==1).X];

edited Feb 23, 2014 at 21:46

answered Jan 6, 2013 at 7:44

s.bandara

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1 Comment

user271077 Over a year ago

thanks! not sure if to open another question for this or not, but do you know how to get a lst of only X for example, I want a field in teh lst and not the struct of the items in the list- but a list of only inner items.

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