3.2 Level 1 BLAS

The level 1 functions implement vector operations.

scal(alpha, x)

Scales a vector by a constant:

If x is a real matrix, the scalar argument alpha must be a Python integer or float. If x is complex, alpha can be an integer, float, or complex.

nrm2(x)

Euclidean norm of a vector: returns

asum(x)

1-Norm of a vector: returns

iamax(x)

Returns

If more than one coefficient achieves the maximum, the index of the first k is returned.

swap(x, y)

Interchanges two vectors:

x and y are matrices of the same type (’d’ or ’z’).

copy(x, y)

Copies a vector to another vector:

x and y are matrices of the same type (’d’ or ’z’).

axpy(x, y[,alpha=1.0])

Constant times a vector plus a vector:

x and y are matrices of the same type (’d’ or ’z’). If x is real, the scalar argument alpha must be a Python integer or float. If x is complex, alpha can be an integer, float, or complex.

dot(x, y)

Returns

x and y are matrices of the same type (’d’ or ’z’).

dotu(x, y)

Returns

x and y are matrices of the same type (’d’ or ’z’).