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

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Rightia Rollmann
Rightia Rollmann 2017-3-6
评论： Adam 2017-3-6
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();
  2 个评论
Walter Roberson
Walter Roberson 2017-3-6
No,
Rectangles1(2, 5).r = rectangle();
only assigns 1 rectangle, to element (2,5) . The "r" fields for the other structure members will be empty.
Adam
Adam 2017-3-6
A for loop seems like the best way. rectangle does not support vectorised creation and if you try to get fancy with something like:
[ Rectangles2(1, 1:5).r ] = deal( rectangle() );
you get a rectangle in each of your structs, but it is a reference to the same rectangle in all of them which I assume is not what you want.
To create 5 distinct rectangles you will need 5 calls to rectangle( ) by some method or other.

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Walter Roberson
Walter Roberson 2017-3-6
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
  2 个评论
Adam
Adam 2017-3-6
Try it without and you'll get an error message telling you. Basically it means a regular array of whatever the output is is not supported by arrayfun though so you need the 'catch-all' option of dumping the outputs into a cell array.

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