[TOC]

`struct`

Creating struct array

Usage

`struct`

It creates a structure scalar (i.e., size $1\times 1$ ) with no fields.

`struct([])`

It creates an empty structure array (i.e., size $0\times 0$ )

`struct(f1, v1, ..., fk, vk)`

It creates a structure scalar with k fields.
f1, ..., fk should be character vectors containing the given field names.
v1, ..., vk are given values of the fields.

Difference with MATLAB

MATLAB	SIMO
`v1`, ..., `vk` can be a cell arrays, so that a multi-dimensional array can be created.	Cell array not supported
Mutli-dimensiona structure array can be created	Only scalar structure can be created

Examples

struct is an $1\times 1$ structure scalar with no fields.

Input

s = struct
size(s)

Output

s =
 struct with no field

ans = 
 1.0000   1.0000

struct([]) is an empty structure array (with no fields).

Input

s = struct([])
size(s)

Output

[] (struct)

ans = 
 0.0000   0.0000

Creating a $2\times 2$ structure array.

Input

mazda2.manufacturer = 'mazda';
mazda2.engine = struct('diesel', false, 'capacity', 1400, 'turbo', false);
mazda2.tire(1) = struct('brand', 'yokohama', 'position', 'FL');
mazda2.tire(2) = struct('brand', 'yokohama', 'position', 'FR');
mazda2.tire(3) = struct('brand', 'yokohama', 'position', 'RL');
mazda2.tire(4) = struct('brand', 'yokohama', 'position', 'RR');

corolla.manufacturer = 'toyoto';
corolla.engine = struct('disel', false, 'capacity', 1500, 'turbo', false);
corolla.tire(1) = struct('brand', 'toyo', 'position', 'FL'); 
corolla.tire(2) = struct('brand', 'toyo', 'position', 'FR'); 
corolla.tire(3) = struct('brand', 'toyo', 'position', 'RL'); 
corolla.tire(4) = struct('brand', 'toyo', 'position', 'RR'); 

model3.manufacturer = 'tesla';
model3.engine = 'electric';
model3.tire(1) = struct('brand', 'michelin', 'position', 'FL');
model3.tire(2) = struct('brand', 'michelin', 'position', 'FR');
model3.tire(3) = struct('brand', 'michelin', 'position', 'RL');
model3.tire(4) = struct('brand', 'michelin', 'position', 'RR');

prius.manufacturer = 'toyota';
prius.engine = 'hybrid';
prius.tire(1) = struct('brand', 'goodyear', 'position', 'FL'); 
prius.tire(2) = struct('brand', 'goodyear', 'position', 'FR'); 
prius.tire(3) = struct('brand', 'goodyear', 'position', 'RL'); 
prius.tire(4) = struct('brand', 'goodyear', 'position', 'RR'); 

% 2 x 2 structure array
cars = [mazda2, corolla; model3 prius]

Output

cars =
 struct array (2 x 2) with fields:
 engine, tire, manufacturer