MATLAB: Easiest Way to Assign Graphics Objects to a 1-by-n Struct

struct

How to assign graphics objects to a 1-by-5 struct field? Is there an easier way than using a for loop and assign the values elementwise?

When there is more than one row, it works perfectly and I get 10 rectangles:

Rectangles1(2, 5).r = rectangle();

But when I run the code below with only one row, MATLAB only creates one rectangle, instead of 5 rectangles?

Rectangles2(1, 5).r = rectangle();

Best Answer

template = ones(2,5);     %shape matters, content does not
Rectangles2 = cell2mat( arrayfun( @(r) struct('r', rectangle()), template, 'Uniform', 0) );

This will, however, overwrite the entire contents of Rectangles2

Related Solutions

MATLAB: Accessing all the values of a specific structure field in a matrix of structure to a cell array.

for x = 1:N
   %I'm not sure why you used RList(1, :) which will result in an error
   %if numel(Rlist(1, :)) ~= numel(func(x))
   %Using just plain assignment
   RList = func(x);    
   All_a(x, :) = {RList.a};  %assign all a fields to cell array
end

The above uses matlab's concept of comma-separated lists. RList.a (when RList is a structure array) returns a comma separated list of all the a values. This is then wrapped into a cell array with {}.

Alternatively, you could build a 2d structure array in the loop and convert it all at once to a cell array afterward, using struct2cell:

RList = []; %make sure it is empty to avoid errors in the assignment
for x = 1:N
   RList(x, :) = func(x);
end
All_fields = struct2cell(RList); %returns a numfields * N * 50 cell array
All_fields = squeeze(All_fields(strcmp('a', fieldnames(RList)), :, :));  %filter 'a' field

MATLAB: How to get an n-by-n matrix from 1-by-n cells

One solution:

T1 = array2table(ratings);
T1.Properties.VariableNames = users;
T1.Properties.RowNames = movies;

Another solution:

T2 = table();
T2.movies = repmat(movies',6,1);
T2.users = repelem(users',6);
T2.ratings = ratings(:);

Best Answer

Related Solutions

MATLAB: Accessing all the values of a specific structure field in a matrix of structure to a cell array.

MATLAB: How to get an n-by-n matrix from 1-by-n cells

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