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MATLAB - Navigation in a struct


MATLAB - Navigation in a struct

By : Natalie Rahhal
Date : November 21 2020, 09:01 AM
With these it helps As discussed above, one method is to utilize dynamic field referencing.
An example, working from your comments, the assumption that struct.substruct contains only one element, and the documentation for fieldnames:
code :
mystruct.substruct.boogers.data = 12;

myfield = fieldnames(mystruct.substruct); % Returns 1x1 cell
mydata = mystruct.substruct.(myfield{1}).data;
mydata =

    12


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Extract a single struct from a Matlab struct of arrays

Extract a single struct from a Matlab struct of arrays


By : eezlebrot
Date : March 29 2020, 07:55 AM
this one helps. Suppose I'm given a struct of arrays, e.g.: , It s not as short as s1 = extractstruct(s, ix), but I would do that:
code :
s.foo = rand(3);
s.bar = rand(1,3);
xi=1;

s2=reshape([fieldnames(s)'; cellfun(@(x) x(xi,:),struct2cell(s)','UniformOutput',0)],1,[]);
s2=struct(s2{:})


s2 = 

    foo: [0.8147 0.9134 0.2785]
    bar: [0.7922 0.9595 0.6557]
Reference equality in Matlab struct. Can a struct have multiple field names pointing to the same object?

Reference equality in Matlab struct. Can a struct have multiple field names pointing to the same object?


By : comara
Date : March 29 2020, 07:55 AM
should help you out I recently found out a way to find an answer. One can type in the followings in the Matlab cmd.
code :
A=magic(3);
S=struct('field1',A,'field2',A);
format debug
S.field1
S.field2
>> S.field1

ans =


Structure address = 369610c0 
m = 3
n = 3
pr = 3fb54e40 
pi = 0
     8     1     6
     3     5     7
     4     9     2

>> S.field2

ans =


Structure address = 369610c0 
m = 3
n = 3
pr = 3fb54e40 
pi = 0
     8     1     6
     3     5     7
     4     9     2
Bind function-field of the matlab struct with other struct's fields

Bind function-field of the matlab struct with other struct's fields


By : Jakob Jug
Date : March 29 2020, 07:55 AM
Does that help What you seem to do is try to work in an object-oriented way with Matlab. The most recent versions of Matlab accept special syntax to declare classes. For example, your code would be rewritten (the code needs to be in a file that has the same name as the class, i.e. MyClass.m):
code :
classdef MyClass < handle

    properties
        input;
        kernel;
        output;
    end;

    methods
        function obj = MyClass()
            input  = unifrnd(-1, 1, [9 9]);
            kernel = unifrnd(-1, 1, [7 7]);
            output = zeros(3, 3);
        end

        function f(obj) 
            obj.output = conv2(obj.input, obj.kernel, 'valid'); 
        end  
    end;
end;
my_obj = MyClass();
my_obj.f();
disp my_obj.output;
How to export field values from a struct to another struct in Matlab?

How to export field values from a struct to another struct in Matlab?


By : kakakovic
Date : March 29 2020, 07:55 AM
seems to work fine It's because B and Lbp do not have the same fields. Try the following:
code :
B(r,c) = struct('Area',[]);
MATLAB struct - Programatically define data-type for fields at struct instantiation?

MATLAB struct - Programatically define data-type for fields at struct instantiation?


By : user2615474
Date : March 29 2020, 07:55 AM
it helps some times You can check for the type of variable before the adding operation, so instead of:
code :
StructName.FieldName = yourVariable;
if (isnumeric(yourVariable))
     StructName.FieldName = yourVariable;
end
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