Cell arrays and the unique function
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Hi all,
Working on some code to remove cell arrays so I can convert the code to C using Matlab Coder.
Just wondering what the right way of going about it would be for something like this:
myvalues = unique({input_x.(my_name)});
The input is a cell array, so the unique function also returns a cell array, neither of which I want. Any pointers of how to go about this to remove the cell arrays would be appreciated.
Thanks
采纳的回答
You can proceed as follows:
>> c = {1, 2, 3, 4}
c =
[1] [2] [3] [4]
>> [c{:}]
ans =
1 2 3 4
It is applied to struct arrays as follows:
>> input_x = struct('a', {7,8,9,5,4,3}) ;
>> [input_x.a]
ans =
7 8 9 5 4 3
or, if the fieldname is not static
>> [input_x.('a')]
ans =
7 8 9 5 4 3
In fact, c{:} is a comma-separated list (the same that you have when you define columns of an array, or when you list arguments in function calls), so the outcome of "square-bracketting" it is an array. It is something quite useful when you want to pass elements of a cell array to a function as if you were listing arguments separated by commas. To illustrate..
function myPrintf(format, varargin)
% do something..
fprintf(format, varargin{:}) ;
end
Calling
myPrintf('Name:%s, age:%d, streetNo:%d\n', 'John', 40, 12) ;
leads to varargin = {'John', 40, 12}, and using it as a comma-sep. list with varargin{:} in the call to FPRINTF is indeed performing the following call
fprintf('Name:%s, age:%d, streetNo:%d\n', 'John', 40, 12) ;
.. it's the to some extent the MATLAB way for managing cases where you'd use a vector function in C, e.g. vfprintf ..
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