IDAMAX Type
***PURPOSE Find the smallest index of that component of a vector having the maximum magnitude. ***CATEGORY D1A2 ***TYPE DOUBLE PRECISION (ISAMAX-S, IDAMAX-D, ICAMAX-C) ***KEYWORDS BLAS, LINEAR ALGEBRA, MAXIMUM COMPONENT, VECTOR ***AUTHOR Lawson, C. L., (JPL) Hanson, R. J., (SNLA) Kincaid, D. R., (U. of Texas) Krogh, F. T., (JPL) ***DESCRIPTION B L A S Subprogram Description of Parameters --Input-- N number of elements in input vector(s) DX double precision vector with N elements INCX storage spacing between elements of DX --Output-- IDAMAX smallest index (zero if N .LE. 0) Find smallest index of maximum magnitude of double precision DX. IDAMAX = first I, I = 1 to N, to maximize ABS(DX(IX+(I-1)*INCX)), where IX = 1 if INCX .GE. 0, else IX = 1+(1-N)*INCX. ***REFERENCES C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T. Krogh, Basic linear algebra subprograms for Fortran usage, Algorithm No. 539, Transactions on Mathematical Software 5, 3 (September 1979), pp. 308-323. ***ROUTINES CALLED (NONE) ***REVISION HISTORY (YYMMDD) 791001 DATE WRITTEN 890531 Changed all specific intrinsics to generic. (WRB) 890531 REVISION DATE from Version 3.2 891214 Prologue converted to Version 4.0 format. (BAB) 900821 Modified to correct problem with a negative increment. (WRB) 920501 Reformatted the REFERENCES section. (WRB) ***END PROLOGUE IDAMAX ***FIRST EXECUTABLE STATEMENT IDAMAX
Constructors
| Constructor | Description |
Full Usage:
IDAMAX()
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Instance members
| Instance member | Description |
Full Usage:
this.Run
Parameters:
int
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number of elements in input vector(s)
DX : float[]
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double precision vector with N elements
offset_dx : int
-
INCX : int
-
storage spacing between elements of DX
Returns: int
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***PURPOSE Find the smallest index of that component of a vector having the maximum magnitude. ***CATEGORY D1A2 ***TYPE DOUBLE PRECISION (ISAMAX-S, IDAMAX-D, ICAMAX-C) ***KEYWORDS BLAS, LINEAR ALGEBRA, MAXIMUM COMPONENT, VECTOR ***AUTHOR Lawson, C. L., (JPL) Hanson, R. J., (SNLA) Kincaid, D. R., (U. of Texas) Krogh, F. T., (JPL) ***DESCRIPTION B L A S Subprogram Description of Parameters --Input-- N number of elements in input vector(s) DX double precision vector with N elements INCX storage spacing between elements of DX --Output-- IDAMAX smallest index (zero if N .LE. 0) Find smallest index of maximum magnitude of double precision DX. IDAMAX = first I, I = 1 to N, to maximize ABS(DX(IX+(I-1)*INCX)), where IX = 1 if INCX .GE. 0, else IX = 1+(1-N)*INCX. ***REFERENCES C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T. Krogh, Basic linear algebra subprograms for Fortran usage, Algorithm No. 539, Transactions on Mathematical Software 5, 3 (September 1979), pp. 308-323. ***ROUTINES CALLED (NONE) ***REVISION HISTORY (YYMMDD) 791001 DATE WRITTEN 890531 Changed all specific intrinsics to generic. (WRB) 890531 REVISION DATE from Version 3.2 891214 Prologue converted to Version 4.0 format. (BAB) 900821 Modified to correct problem with a negative increment. (WRB) 920501 Reformatted the REFERENCES section. (WRB) ***END PROLOGUE IDAMAX ***FIRST EXECUTABLE STATEMENT IDAMAX
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