Sparse elementary vector operation | SAXPYI/DAXPYI/CAXPYI/ZAXPYI | |
| INTEGER*8 | m, indx(m) |
| COMPLEX*8 | a, x(m), y(n) |
| CALL CAXPYI(m, a, x, indx, y) | |
| INTEGER*8 | m, indx(m) |
| COMPLEX*16 | a, x(m), y(n) |
| CALL ZAXPYI(m, a, x, indx, y) | |
Input | m | Number of interesting elements of x, m ≤ n, where n is |
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| the length of y. If m ≤ 0, the subprograms do not |
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| reference x, indx, or y. |
| a | The scalar a. |
| x | Array of length m containing the interesting elements |
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| of x. x(j) = xi if indx(j) = i. |
Chapter 2 Basic Vector Operations 69