User Manual

184 Index
184
Preconditioning a system · 91–93
Present value · 24–39
Principal branch · 59–62
Principal value · 59–62
Q
Quadratic equation, roots · 160, 171–77
Quadratic surface · 126, 129–30
R
Radians, in complex mode · 58
Rate of return · 34–39
Recalling complex numbers · 65–66
Rectangular form · 59
Refinement, iterative · 88
Regression sum of squares · 111–18
mean-adjusted · 113
Regression, multiple linear . See also Least-squares · 111
Relative error · 146, 153
complex · 63–65
Relative uncertainty of matrix · 85
Repeated estimation · 22–24
Residual · 100–102
Residual correction · 100–102
Residual sum of squares · 111–18
Resonance · 41
Return, rate of · 34–39
Romberg method · 41
Roots
complex · 69–73, 17–18
equations with several · 12
inaccurate · 11–12
multiple · 12
not found · 11, 26
numerically finding · 9–39
of complex number · 59, 67–69
of equation, complex · 69–73
of quadratic equation · 160, 171–77
Rounding error · 41, 42
Round-off error . See also Rounding error · 41, 42
Row interchange · 82, 83, 98
Row norm · 84, 168
S
Saddle-point · 137
Samples, _ · 9–11, 63