func ExampleFFT1D() {
N := 8
hostIn := make([]float32, N)
hostIn[0] = 1
devIn := cu.MemAlloc(int64(len(hostIn)) * cu.SIZEOF_FLOAT32)
defer cu.MemFree(&devIn)
cu.MemcpyHtoD(devIn, unsafe.Pointer(&hostIn[0]), devIn.Bytes())
hostOut := make([]complex64, N/2+1)
devOut := cu.MemAlloc(int64(len(hostOut)) * cu.SIZEOF_COMPLEX64)
defer cu.MemFree(&devOut)
plan := Plan1d(N, R2C, 1)
defer plan.Destroy()
plan.ExecR2C(devIn, devOut)
cu.MemcpyDtoH(unsafe.Pointer(&hostOut[0]), devOut, devOut.Bytes())
fmt.Println("hostIn:", hostIn)
fmt.Println("hostOut:", hostOut)
// Output:
// hostIn: [1 0 0 0 0 0 0 0]
// hostOut: [(1+0i) (+1+0i) (+1+0i) (+1-0i) (+1+0i)]
}
// internal base func for all makeXXX() functions
func makeslice(len_ int, elemsize int) slice {
bytes := int64(len_) * int64(elemsize)
s := slice{0, len_, len_}
if bytes > 0 {
s.ptr_ = cu.MemAlloc(bytes)
cu.MemsetD8(s.ptr_, 0, bytes)
cu.CtxSynchronize()
}
return s
}