Visible to Intel only — GUID: GUID-0A4A3B84-82E5-4B63-91A8-1811C81CFBC9
Visible to Intel only — GUID: GUID-0A4A3B84-82E5-4B63-91A8-1811C81CFBC9
BLAS Level 1 Routines That Can Work With Sparse Vectors
The following BLAS Level 1 routines will give correct results when you pass to them a compressed-form array x(with the increment incx=1):
- ?asum
-
sum of absolute values of vector elements
- ?copy
-
copying a vector
- ?nrm2
-
Euclidean norm of a vector
- ?scal
-
scaling a vector
- i?amax
-
index of the element with the largest absolute value for real flavors, or the largest sum |Re(x(i))|+|Im(x(i))| for complex flavors.
- i?amin
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index of the element with the smallest absolute value for real flavors, or the smallest sum |Re(x(i))|+|Im(x(i))| for complex flavors.
The result i returned by i?amax and i?amin should be interpreted as index in the compressed-form array, so that the largest (smallest) value is x(i); the corresponding index in full-storage array is indx(i).
You can also call ?rotg to compute the parameters of Givens rotation and then pass these parameters to the Sparse BLAS routines ?roti.