Range of values
y = range(X,dim)
range(X) returns the difference between the maximum and the minimum of a sample. For vectors, range(x) is the range of the elements. For matrices, range(X) is a row vector containing the range of each column of X. For N-dimensional arrays, range operates along the first nonsingleton dimension of X.
y = range(X,dim) operates along the dimension dim of X.
range treats NaNs as missing values and ignores them.
The range is an easily-calculated estimate of the spread of a sample. Outliers have an undue influence on this statistic, which makes it an unreliable estimator.
The range of a large sample of standard normal random numbers is approximately six. This is the motivation for the process capability indices Cp and Cpk in statistical quality control applications.
rv = normrnd(0,1,1000,5); near6 = range(rv) near6 = 6.1451 6.4986 6.2909 5.8894 7.0002