ScalingMatrix[{s_x, s_y, ...}] gives the matrix corresponding to scaling by a factor s_i along each coordinate axis.ScalingMatrix[s, v] gives the matrix corresponding to ...
Short
(Built-in Mathematica Symbol) Short[expr] prints as a short form of expr, less than about one line long. Short[expr, n] prints as a form of expr about n lines long.
SimpleGraph[g] gives the underlying simple graph from the graph g.
SimpleGraphQ[g] yields True if the graph g is a simple graph and False otherwise.
StringForm["controlstring", expr_1, ...] prints as the text of the controlstring, with the printed forms of the expr_i embedded.
"s_1" <> "s_2" <> ..., StringJoin["s_1", "s_2", ...], or StringJoin[{"s_1", "s_2", ...}] yields a string consisting of a concatenation of the s_i.
Subgraph[g, {v_1, v_2, ...}] gives the subgraph of the graph g generated by the vertices v_i.Subgraph[g, {e_1, e_2, ...}] gives the subgraph generated by the edges ...
SymmetricGroup[n] represents the symmetric group of degree n.
SyntaxInformation[f] gives information used to generate syntax coloring and other advisories when f[...] is entered as input.
SystemsModelParallelConnect[sys_1, sys_2] connects TransferFunctionModel or StateSpaceModel objects sys_1 and sys_2 in parallel.SystemsModelParallelConnect[sys_1, sys_2, ...