RowReduce[m] gives the row-reduced form of the matrix m.
Scan
(Built-in Mathematica Symbol) Scan[f, expr] evaluates f applied to each element of expr in turn. Scan[f, expr, levelspec] applies f to parts of expr specified by levelspec.
SelectionEvaluate[notebook] replaces the current selection in a notebook with the result obtained by evaluating the contents of the selection in the kernel. ...
SetAlphaChannel[image] adds a fully opaque alpha channel to image.SetAlphaChannel[image, a] sets the opacity of all pixels to a.SetAlphaChannel[image, aimage] sets the alpha ...
SetSystemOptions["name" -> value] resets the value for the internal system option with the specified name.
ShowStringCharacters is an option for Cell that specifies whether to display " when a string is entered.
Skeleton[n] represents a sequence of n omitted elements in an expression printed with Short or Shallow. The standard print form for Skeleton is <<n>>.
SpanCharacterRounding is an option for selections that specifies the method used for rounding a spanning character when its size is to be adjusted.
StackComplete[expr] evaluates expr with intermediate expressions in evaluation chains included on the stack.
StandardDeviationFilter[image, r] filters image by replacing every value by the standard deviations of the values in its range r neighborhood. StandardDeviationFilter[data, ...