scikits.cuda.cublas.cublasZswap

scikits.cuda.cublas.cublasZswap(handle, n, x, incx, y, incy)[source]

Swap double-precision complex vectors.

Swaps the contents of one double-precision complex vector with those of another double-precision complex vector.

Parameters:

handle : int

CUBLAS context.

n : int

Number of elements in input vectors.

x : ctypes.c_void_p

Pointer to double-precision complex input/output vector.

incx : int

Storage spacing between elements of x.

y : ctypes.c_void_p

Pointer to double-precision complex input/output vector.

incy : int

Storage spacing between elements of y.

Notes

Both x and y must contain n elements.

Examples

>>> import pycuda.autoinit
>>> import pycuda.gpuarray as gpuarray
>>> import numpy as np
>>> x = (np.random.rand(5)+1j*np.random.rand(5)).astype(np.complex128)
>>> y = (np.random.rand(5)+1j*np.random.rand(5)).astype(np.complex128)
>>> x_gpu = gpuarray.to_gpu(x)
>>> y_gpu = gpuarray.to_gpu(y)
>>> h = cublasCreate()
>>> cublasZswap(h, x.size, x_gpu.gpudata, 1, y_gpu.gpudata, 1)
>>> cublasDestroy(h)
>>> np.allclose(x_gpu.get(), y)
True
>>> np.allclose(y_gpu.get(), x)
True