for loop to repeat specified number of time
for index= values
statements
end
executes a group of statements in a loop for a specified number of times. values has one of the following forms:
initVal:endVal — Increment the index variable from initVal to endVal by 1, and repeat execution of statements until index is greater than endVal.
initVal:step:endVal — Increment index by the value step on each iteration, or decrements index when step is negative.
valArray — Create a column vector, index, from subsequent columns of array valArray on each iteration. For example, on the first iteration, index = valArray(:,1). The loop executes a maximum of n times, where n is the number of columns of valArray, given by numel(valArray(1,:)). The input valArray can be of any MATLAB data type, including a character vector, cell array, or struct.
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