Golang Slice.NComp方法代碼示例

// Extract real parts, copy them from src to dst.
// In the meanwhile, check if imaginary parts are nearly zero
// and scale the kernel to compensate for unnormalized FFTs.
func scaleRealParts(dst, src *data.Slice, scale float32) {
	util.Argument(2*dst.Len() == src.Len())
	util.Argument(dst.NComp() == 1 && src.NComp() == 1)

	srcList := src.HostCopy().Host()[0]
	dstList := dst.Host()[0]

	// Normally, the FFT'ed kernel is purely real because of symmetry,
	// so we only store the real parts...
	maximg := float32(0.)
	maxreal := float32(0.)
	for i := 0; i < src.Len()/2; i++ {
		dstList[i] = srcList[2*i] * scale
		if fabs(srcList[2*i+0]) > maxreal {
			maxreal = fabs(srcList[2*i+0])
		}
		if fabs(srcList[2*i+1]) > maximg {
			maximg = fabs(srcList[2*i+1])
		}
	}
	// ...however, we check that the imaginary parts are nearly zero,
	// just to be sure we did not make a mistake during kernel creation.
	if maximg/maxreal > FFT_IMAG_TOLERANCE {
		log.Fatalf("Too large FFT kernel imaginary/real part: %v", maximg/maxreal)
	}
}

func writeOvf2Binary4(out io.Writer, array *data.Slice) {
	data := array.Tensors()
	gridsize := array.Mesh().Size()

	var bytes []byte

	// OOMMF requires this number to be first to check the format
	var controlnumber float32 = OMF_CONTROL_NUMBER
	// Conversion form float32 [4]byte in big-endian
	// encoding/binary is too slow
	// Inlined for performance, terabytes of data will pass here...
	bytes = (*[4]byte)(unsafe.Pointer(&controlnumber))[:]
	out.Write(bytes)

	// Here we loop over X,Y,Z, not Z,Y,X, because
	// internal in C-order == external in Fortran-order
	ncomp := array.NComp()
	for i := 0; i < gridsize[X]; i++ {
		for j := 0; j < gridsize[Y]; j++ {
			for k := 0; k < gridsize[Z]; k++ {
				for c := 0; c < ncomp; c++ {
					bytes = (*[4]byte)(unsafe.Pointer(&data[swapIndex(c, ncomp)][i][j][k]))[:]
					out.Write(bytes)
				}
			}
		}
	}
}

func dumpGnuplot(out io.Writer, f *data.Slice) (err error) {
	buf := bufio.NewWriter(out)
	defer buf.Flush()

	data := f.Tensors()
	gridsize := f.Mesh().Size()
	cellsize := f.Mesh().CellSize()
	// If no cell size is set, use generic cell index.
	if cellsize == [3]float64{0, 0, 0} {
		cellsize = [3]float64{1, 1, 1}
	}
	ncomp := f.NComp()

	// Here we loop over X,Y,Z, not Z,Y,X, because
	// internal in C-order == external in Fortran-order
	for i := 0; i < gridsize[0]; i++ {
		x := float64(i) * cellsize[0]
		for j := 0; j < gridsize[1]; j++ {
			y := float64(j) * cellsize[1]
			for k := 0; k < gridsize[2]; k++ {
				z := float64(k) * cellsize[2]
				_, err = fmt.Fprint(buf, z, " ", y, " ", x, "\t")
				for c := 0; c < ncomp; c++ {
					_, err = fmt.Fprint(buf, data[swapIndex(c, ncomp)][i][j][k], " ") // converts to user space.
				}
				_, err = fmt.Fprint(buf, "\n")
			}
			_, err = fmt.Fprint(buf, "\n")
		}
	}
	return
}

// Memset sets the Slice's components to the specified values.
func Memset(s *data.Slice, val ...float32) {
	util.Argument(len(val) == s.NComp())
	str := stream()
	for c, v := range val {
		cu.MemsetD32Async(cu.DevicePtr(s.DevPtr(c)), math.Float32bits(v), int64(s.Len()), str)
	}
	syncAndRecycle(str)
}

func kernMulRSymm2Dx(fftMx, K00 *data.Slice, N1, N2 int, str cu.Stream) {
	util.Argument(K00.Len() == (N1/2+1)*N2)
	util.Argument(fftMx.NComp() == 1 && K00.NComp() == 1)

	cfg := make2DConf(N1, N2)

	k_kernmulRSymm2Dx_async(fftMx.DevPtr(0), K00.DevPtr(0), N1, N2, cfg, str)
}

// Does not yet use Y mirror symmetry!!
// Even though it is implemented partially in kernel
func kernMulRSymm3D(fftM [3]*data.Slice, K00, K11, K22, K12, K02, K01 *data.Slice, N0, N1, N2 int, str cu.Stream) {
	util.Argument(K00.Len() == N0*(N1)*N2) // no symmetry yet
	util.Argument(fftM[0].NComp() == 1 && K00.NComp() == 1)

	cfg := make2DConf(N1, N2)

	k_kernmulRSymm3D_async(fftM[0].DevPtr(0), fftM[1].DevPtr(0), fftM[2].DevPtr(0),
		K00.DevPtr(0), K11.DevPtr(0), K22.DevPtr(0), K12.DevPtr(0), K02.DevPtr(0), K01.DevPtr(0),
		N0, N1, N2, cfg, str)
}

func kernMulRSymm2Dyz(fftMy, fftMz, K11, K22, K12 *data.Slice, N1, N2 int, str cu.Stream) {
	util.Argument(K11.Len() == (N1/2+1)*N2)
	util.Argument(fftMy.NComp() == 1 && K11.NComp() == 1)

	cfg := make2DConf(N1, N2)

	k_kernmulRSymm2Dyz_async(fftMy.DevPtr(0), fftMz.DevPtr(0),
		K11.DevPtr(0), K22.DevPtr(0), K12.DevPtr(0),
		N1, N2, cfg, str)
}

// Copies src into dst, which is larger or smaller.
// The remainder of dst is not filled with zeros.
func copyPad(dst, src *data.Slice, dstsize, srcsize [3]int, str cu.Stream) {
	util.Argument(dst.NComp() == 1 && src.NComp() == 1)
	util.Assert(dst.Len() == prod(dstsize))
	util.Assert(src.Len() == prod(srcsize))

	N0 := iMin(dstsize[1], srcsize[1])
	N1 := iMin(dstsize[2], srcsize[2])
	cfg := make2DConf(N0, N1)

	k_copypad_async(dst.DevPtr(0), dstsize[0], dstsize[1], dstsize[2],
		src.DevPtr(0), srcsize[0], srcsize[1], srcsize[2], cfg, str)
}

// Adds a constant to each element of the slice.
// 	dst[comp][index] += cnst[comp]
func AddConst(dst *data.Slice, cnst ...float32) {
	util.Argument(len(cnst) == dst.NComp())
	N := dst.Len()
	cfg := make1DConf(N)
	str := stream()
	for c := 0; c < dst.NComp(); c++ {
		if cnst[c] != 0 {
			k_madd2_async(dst.DevPtr(c), dst.DevPtr(c), 1, nil, cnst[c], N, cfg, str)
		}
	}
	syncAndRecycle(str)
}

// Execute the FFT plan, asynchronous.
// src and dst are 3D arrays stored 1D arrays.
func (p *fft3DR2CPlan) ExecAsync(src, dst *data.Slice) {
	util.Argument(src.NComp() == 1 && dst.NComp() == 1)
	oksrclen := p.InputLen()
	if src.Len() != oksrclen {
		log.Panicf("fft size mismatch: expecting src len %v, got %v", oksrclen, src.Len())
	}
	okdstlen := p.OutputLen()
	if dst.Len() != okdstlen {
		log.Panicf("fft size mismatch: expecting dst len %v, got %v", okdstlen, dst.Len())
	}
	p.handle.ExecR2C(cu.DevicePtr(src.DevPtr(0)), cu.DevicePtr(dst.DevPtr(0)))
}

func preprocess(f *data.Slice) {
	if *flag_normalize {
		normalize(f, 1)
	}
	if *flag_normpeak {
		normpeak(f)
	}
	if *flag_comp != -1 {
		*f = *f.Comp(swapIndex(*flag_comp, f.NComp()))
	}
	if *flag_resize != "" {
		resize(f, *flag_resize)
	}
	//if *flag_scale != 1{
	//	rescale(f, *flag_scale)
	//}
}

// Writes data in OMF Text format
func writeOmfText(out io.Writer, tens *data.Slice) (err error) {

	data := tens.Tensors()
	gridsize := tens.Mesh().Size()

	// Here we loop over X,Y,Z, not Z,Y,X, because
	// internal in C-order == external in Fortran-order
	for i := 0; i < gridsize[X]; i++ {
		for j := 0; j < gridsize[Y]; j++ {
			for k := 0; k < gridsize[Z]; k++ {
				for c := 0; c < tens.NComp(); c++ {
					_, err = fmt.Fprint(out, data[swapIndex(c, tens.NComp())][i][j][k], " ") // converts to user space.
				}
				_, err = fmt.Fprint(out, "\n")
			}
		}
	}
	return
}

// multiply-add: dst[i] = src1[i] * factor1 + src2[i] * factor2 + src3 * factor3
func Madd3(dst, src1, src2, src3 *data.Slice, factor1, factor2, factor3 float32) {
	N := dst.Len()
	nComp := dst.NComp()
	util.Assert(src1.Len() == N && src2.Len() == N && src3.Len() == N)
	util.Assert(src1.NComp() == nComp && src2.NComp() == nComp && src3.NComp() == nComp)
	cfg := make1DConf(N)
	str := stream()
	for c := 0; c < nComp; c++ {
		k_madd3_async(dst.DevPtr(c), src1.DevPtr(c), factor1,
			src2.DevPtr(c), factor2, src3.DevPtr(c), factor3, N, cfg, str)
	}
	syncAndRecycle(str)
}

func Image(f *data.Slice, fmin, fmax string) *image.NRGBA {
	dim := f.NComp()
	switch dim {
	default:
		log.Fatalf("unsupported number of components: %v", dim)
	case 3:
		return drawVectors(f.Vectors())
	case 1:
		min, max := extrema(f.Host()[0])
		if fmin != "auto" {
			m, err := strconv.ParseFloat(fmin, 32)
			util.FatalErr(err)
			min = float32(m)
		}
		if fmax != "auto" {
			m, err := strconv.ParseFloat(fmax, 32)
			util.FatalErr(err)
			max = float32(m)
		}
		return drawFloats(f.Scalars(), min, max)
	}
	panic("unreachable")
}

// Copies src into dst, which is larger or smaller, and multiplies by vol*Bsat.
// The remainder of dst is not filled with zeros.
func copyPadMul(dst, src *data.Slice, dstsize, srcsize [3]int, vol *data.Slice, Bsat float64, str cu.Stream) {
	util.Argument(dst.NComp() == 1)
	util.Argument(src.NComp() == 1)
	util.Argument(vol.NComp() == 1)
	util.Assert(dst.Len() == prod(dstsize) && src.Len() == prod(srcsize))
	util.Assert(vol.Mesh().Size() == srcsize)

	N0 := iMin(dstsize[1], srcsize[1])
	N1 := iMin(dstsize[2], srcsize[2])
	cfg := make2DConf(N0, N1)

	k_copypadmul_async(dst.DevPtr(0), dstsize[0], dstsize[1], dstsize[2],
		src.DevPtr(0), srcsize[0], srcsize[1], srcsize[2],
		vol.DevPtr(0), float32(Bsat), cfg, str)
}