Iterate over a vector in matlab - matlab

Question

So I'm working on a program. I need to iterate over a vector similar to this sample = [0; 0; 0; 1; 1; 1 ; 0]. I was thinking about using loops with accumulators to build a new 2d array where column 1 is how many 0s or 1s appear and column 2 is for which token it is. But I'm new to the syntax of matlab and checking the docs i mostly see slicing. Any ideas about building the new matrix are welcome.
sample vector and output below
arr = [0; 0; 0; 1; 1; 1; 0];
tokenizeSignal(arr)
ans =
3 0
3 1
1 0

Answer 1

Proposed strategy (array contains only 1 and 0) :
Initialize 2 counters
count_0 = 0;
count_1 = 0;
Iterate over the whole array arr
arr = [0; 0; 0; 1; 1; 1; 0];
[n,m] = size(arr); %m is espected equal to 1
y = arr[1,1]; %first element of the array, we need a reference
Start the loop and read the current element
for i=1:n
x = arr[i,1];
start to count how many zeros or how many ones from the last group if the last element was zero or one
if (x == 0 && y == 0)
count_0 = count_0 + 1;
count_1 = 0;
else if (x == 1 && y == 1)
count_1 = count_1 + 1;
count_0 = 0;
end
print every time the value will change (last term of a "sequence")
if (x != arr[1,i+1] && count_1 > 0 && i<n)
print(count_1, '1');
else if (x != arr[1,i+1] && count_0 > 0 && i<n)
print(count_0, '0');
end
update the values and close the FOR loop
y = x;
end
out of the cycle, print the last time
if (count_1 > 0)
print(count_1, '1');
else if (count_0 >)
print(count_0, '0');
end
Of course you can change the print with store the values in a proper array.