Load a structure that contains information about roads in Concord, MA.
roads = shaperead('concord_roads.shp');
r = roads(1:5);
Get the x- and y-coordinates of the roads. Display the map, and highlight the first few elements using the color magenta.
hold on
plot(extractfield(roads,'X'),extractfield(roads,'Y'));
plot(extractfield(r,'X'),extractfield(r,'Y'),'m');
Extract the names of the roads, stored in the field STREETNAME. The field values are character vectors, so the result is returned in a cell array.
names = extractfield(r,'STREETNAME');
Extract the X field from the structure and examine the format of the returned values. All values have the same numeric data type (double), so the result is returned in a vector.
uniformType = extractfield(r,'X');
For illustrative purposes, change the X field value in one of the elements to have a different data type. This command converts the second element to data type single.
r(2).X = single(r(2).X);
Extract the X field values again. This time, the values have different data types, so the result is returned in a cell array.
Extracted field values, returned as a 1-by-n numeric
vector or cell array. n is the total number of elements
in the field name of structure S,
that is, n = numel([S(:).(name)]). a
is a cell array if any field values in the field name contain a character
vector or if the field values are not uniform in type; otherwise
a is the same type as the field values. The shape
of the input field is not preserved in a.
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