In Java I can directly loop over elements in an array, e.g.:
int[] array = [1,2,3,4];
for (int elem: array){
System.out.println(elem);
}
Instead of looping via indices
int[] array = [1,2,3,4];
for(int i=0; i<array.length; i++){
System.out.println(array[i]);
}
How can I do the same in MATLAB?
In Matlab the two options analogous to those in your question are:
%// Loop via indices
array = [10 20 30 40];
for n = 1:numel(array)
disp(array(n));
end
%// Loop over elements directly
array = [10 20 30 40];
for elem = array
disp(elem);
end
Some notes:
When looping via indices, the statement for n = 1:1000 does not create the whole array 1:1000. So you can safely write for example for n = 1:inf (and maybe then use a break within the loop).
When an array is proveded in the loop statement, Matlab loops over columns. So for example
%// Loop over elements (columns) directly
array = [10 20 30 40; 50 60 70 80];
for elem = array
disp(elem);
end
would set elem to [10; 50], then [20; 60] etc
The array can be any type, not necessarily numeric (and the column rule still applies). For example,
%// Loop over elements (columns) directly, using a cell array
array = {'Hello', 'Hi'; 'Goodbye' 'Godspeed'};
for elem = array
disp(elem);
end
makes elem equal to the column cell array {'Hello'; 'Goodbye'} and then to {'Hi'; 'Godspeed'}
