SplineKnots is an option for B-spline functions and graphics primitives that specifies the positions of knots.
SplineWeights is an option for B-spline functions and graphics primitives that specifies weights of control points.
SquaredEuclideanDistance[u, v] gives the squared Euclidean distance between vectors u and v.
SquareFreeQ[expr] gives True if expr is a square-free polynomial or number, and False otherwise.SquareFreeQ[expr, vars] gives True if expr is square free with respect to the ...
SquareWave[x] gives a square wave that alternates between +1 and -1 with unit period.SquareWave[{y_1, y_2}, x] gives a square wave that alternates between y_1 and y_2 with ...
StateSpaceRealization is an option to StateSpaceModel that specifies its canonical representation.
StirlingS1[n, m] gives the Stirling number of the first kind S_n^(m).
StringCount["string", " sub"] gives a count of the number of times " sub" appears as a substring of " string". StringCount["string", patt] gives the number of substrings in " ...
StringDrop["string", n] gives " string" with its first n characters dropped. StringDrop["string", -n] gives " string" with its last n characters dropped. StringDrop["string", ...
StringForm["controlstring", expr_1, ...] prints as the text of the controlstring, with the printed forms of the expr_i embedded.