compile using the command:
gcc blas1C.c ../common/blaio.c -lcblas -I../common/


cblas_dswap: Exchanges the elements of two vectors (double precision)
cblas_dcopy: Copies a vector to another vector (double-precision).
cblas_dscal: scales a vector/array
cblas_daxpy: Computes a vector-scalar product and adds the result to a vector.
