How do i define a structure in Matlab

I know that a structure can be defined by in several ways such as:

  1. Adding fields to a variable = .2; = .4; = .7;
  2. Defining a scalar structure by assignment

    S = struct('a',  0, 'b',  1, 'c',  2);

What I want to be able to do is create a structure definition (like C). My end goal is to have an array of structures that i can iterate through and perform testing on. Is there any way I can define a generic structure and then create instances of it? Should I use some other mechanism. I know MATLAB supports Java, should I use a class/interface?

How do i define a structure in Matlab

I know that a structure can be defined by in several ways such as: Adding fields to a variable = .2; = .4; = .7; Defining a scalar structure by assignment S =

How do I define an object variable structure in JavaScript? [closed]

I want to define something like the following object structure, so I can populate it from a number of sources. What statements do I need to define it? Offices[] is an open-ended array as is rel[] unde

How do you read a structure in MATLAB?

I have a structure in MATLAB. So I’ve loaded my structure and got my substructure and typed in the variable and I get [4158×5 double]. How do I get the array itself? I’ve been trying to figure this ou

How do I define subclasses?

this fiddle shows my problem. How would I define a subclass of class=line in the thml and css structure so that the subclass would not have a border-top-style as shown in Example 2? Thank you. EDIT

How do I rename a field in a structure array in MATLAB?

Given a structure array, how do I rename a field? For example, given the following, how do I change bar to baz. clear a(1).foo = 1; a(1).bar = ‘one’; a(2).foo = 2; a(2).bar = ‘two’; a(3).foo = 3;

How do I access #define Variable from one structure in c file?

#define MAX 7 #define BUFFER 16 #define MODULO 8 typedef struct { int x; } BLAH; if I have: checkWindow(BLAH *b) { int mod; mod = b.MODULO; } Specifically can I access MODULO from the BLAH structu

How do I define a method in Razor?

How do I define a method in Razor?

In C# how do I define my own Exceptions?

In C# how do I define my own Exceptions?

How do I import/include MATLAB functions?

I have some MATLAB functions defined in .m files and I’d like to import them into MATLAB (as in I’d like to be able to call them as I do a built-in function). How can I do this?

How to define error bar in Matlab

I would like to define error bars on both ends for matlab. Usually, the example of matlab would be where the error bar would take the standard d


Unlike C, Matlab allows you to add or remove members from a struct as you go. It’s more of a convention that a struct with certain fields can be used with certain functions.

So yes, those are the two basic ways to create structures. Of course, you can always write a function in a *.m file which creates a structure with certain fields for you. Or if you want to get more OO, see here

You mentioned your goal was to work with several structure of the same type, therefore you should be aware of the main two approaches available to you and how they compare:

1) array of structures

You can initialize it by growing the array dynamically

p(1).str = 'white';
p(1).r = 1;
p(1).g = 1;
p(1).b = 1;
p(2).str = 'black';
p(2).r = 0;
p(2).g = 0;
p(2).b = 0;

However its always better to start by pre-allocating the array

p = repmat( struct('r',[], 'g',[], 'b',[], 'str',[]), 1, 10);

another trick to pre-allocate:

p(10) = struct('r',[], 'g',[], 'b',[], 'str',[]);

Or even give all values at initialization:

p = struct('r',{1 0}, 'g',{1 0}, 'b',{1 0}, 'str',{'white' 'black'});

A simple way to fill values

names = {'white' 'black'};
[p(1:2).str] = names{:};
red = num2cell([1 0]);
[p(1:2).r] = red{:};

Here’s how you retrieve all values of one field:

red = [p(:).r];
names = {p(:).str};

2) structures of arrays

p.r = [1 0];
p.g = [1 0];
p.b = [1 0];
p.str = {'white' 'black'};

p1 = [p.r(1) p.g(1) p.b(1)];

The advantage of this is that the structure is simply an array of pointer (r,g,b,str are stored separately in memory). Compare this to the previous approach, where we have an array of structure, and each structure has pointers to its field (there’s quite a memory overhead):

>> s1 = repmat( struct('r',0, 'g',0, 'b',0), 1, 1000);
>> s2 = struct('r',zeros(1,1000), 'g',zeros(1,1000), 'b',zeros(1,1000));
>> whos
  Name      Size               Bytes  Class     Attributes

  s1        1x1000            204192  struct              
  s2        1x1                24372  struct              

On the other hand, since each of the fields of a structure is stored as an array of its own, it is up to you to enforce the fact that they have to match in length.

Some others posts if you want to read more about this: