138 Alphabetical Listing
QR
Catalog >
computations are done using floating-
point arithmetic.
• If Tol is omitted or not used, the default
tolerance is calculated as:
5E−14 •max(dim(Matrix)) •rowNorm
(Matrix)
The QR factorization is computed
numerically using Householder
transformations. The symbolic solution is
computed using Gram-Schmidt. The
columns in qMatName are the orthonormal
basis vectors that span the space defined by
matrix.
QuadReg
Catalog >
QuadReg X,Y[, Freq][, Category, Include]]
Computes the quadratic polynomial
regression y=a•x
2
+b•x+c on lists X and Y
with frequency Freq. A summary of results
is stored in the stat.results variable. (See
page 172.)
All the lists must have equal dimension
except for Include.
X and Y are lists of independent and
dependent variables.
Freq is an optional list of frequency values.
Each element in Freq specifies the
frequency of occurrence for each
corresponding X and Y data point. The
default value is 1. All elements must be
integers ≥ 0.
Category is a list of category codes for the
corresponding X and Y data.
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