Print the linear model
str=stepwiselm_print(multiindices,inputlabels)
a nbcoeffs-by-m matrix of doubles, integer value, greater or equal than 0, the exponents
a 1-by-m matrix of doubles, integer value, greater or equal than 0, the exponents
a nbcoeffs-by-1 matrix of strings, the labels of each sub-model
Prints the linear model.