Document statistical functions

[pspp] / doc / matrices.texi

diff --git a/doc/matrices.texi b/doc/matrices.texi
index 5b3ff9a9eacdf5f81f3821e0c8b1630b88b40e24..fa38a1784f1cc317512b477fa40d3a637ced7f2c 100644 (file)
--- a/doc/matrices.texi
+++ b/doc/matrices.texi
@@ -1708,8 +1708,25 @@ SWEEP(M, 3) @result{}
 @end format
 @end deffn
 
-@node Matrix IO
-@subsubsection I/O Function
+@node Matrix Statistical Distribution Functions
+@subsubsection Matrix Statistical Distribution Functions
+
+The matrix language can calculate several functions of standard
+statistical distributions using the same syntax and semantics as in
+@pspp{} transformation expressions.  @xref{Statistical Distribution
+Functions}, for details.
+
+The matrix language extends the PDF, CDF, SIG, IDF, NPDF, and NCDF
+functions by allowing the first parameters to each of these functions
+to be a vector or matrix with any dimensions.  In addition,
+@code{CDF.BVNOR} and @code{PDF.BVNOR} allow either or both of their
+first two parameters to be vectors or matrices; if both are non-scalar
+then they must have the same dimensions.  In each case, the result is
+a matrix or vector with the same dimensions as the input populated
+with elementwise calculations.
+
+@node Matrix EOF Function
+@subsubsection EOF Function
 
 This function works with files being used on the @code{READ} statement.