Index of maximum of magnitudes | ISAMAX/IDAMAX/IIAMAX/ICAMAX/IZAMAX | |
| INTEGER*4 | i, ICAMAX, n, incx |
| COMPLEX*8 | x(lenx) |
| i = ICAMAX(n, x, incx) | |
| INTEGER*4 | i, IZAMAX, n, incx |
| COMPLEX*16 | x(lenx) |
| i = IZAMAX(n, x, incx) | |
| VECLIB8: |
|
| INTEGER*8 | i, ISAMAX, n, incx |
| REAL*4 | x(lenx) |
| i = ISAMAX(n, x, incx) | |
| INTEGER*8 | i, IDAMAX, n, incx |
| REAL*8 | x(lenx) |
| i = IDAMAX(n, x, incx) | |
| INTEGER*8 | i, IIAMAX, n, incx, x(lenx) |
| i = IIAMAX(n, x, incx) | |
| INTEGER*8 | i, ICAMAX, n, incx |
| COMPLEX*8 | x(lenx) |
| i = ICAMAX(n, x, incx) | |
| INTEGER*8 | i, IZAMAX, n, incx |
| COMPLEX*16 | x(lenx) |
| i = IZAMAX(n, x, incx) | |
Input | n | Number of elements of vector x to be used. If n ≤ 0, the |
|
| subprograms do not reference x. |
| x | Array of length lenx = (n−1)⋅incx+1 containing the |
|
| |
| incx | Increment for the array x. x is stored forward in array x |
|
| with increment incx; that is, xi is stored in |
|
| x((i−1) ⋅incx+1). |
|
| Use incx = 1 if the vector x is stored contiguously in |
|
| array x; that is, if xi is stored in x(i). Refer to “BLAS |
|
| Indexing Conventions” in the introduction to this |
|
| chapter. |
Output | i | If n ≤ 0, then i = 0. Otherwise, i is the index of the |
|
| element of x of maximum magnitude. |
Chapter 2 Basic Vector Operations 41