| private curandGenerateLogNormal ( ManagedCuda.CudaRand.CurandGenerator generator, ManagedCuda.BasicTypes.CUdeviceptr outputPtr, ManagedCuda.BasicTypes.SizeT n, float mean, float stddev ) : CurandStatus | ||
| generator | ManagedCuda.CudaRand.CurandGenerator | |
| outputPtr | ManagedCuda.BasicTypes.CUdeviceptr | |
| n | ManagedCuda.BasicTypes.SizeT | |
| mean | float | |
| stddev | float | |
| return | CurandStatus | |
/// <summary>
/// Use generator to generate num float results into the device memory at
/// outputPtr. The device memory must have been previously allocated and be
/// large enough to hold all the results. Launches are done with the stream
/// set using ::curandSetStream(), or the null stream if no stream has been set.
/// <para/>
/// Results are 32-bit floating point values with log-normal distribution based on
/// an associated normal distribution with mean mean and standard deviation stddev.
/// <para/>
/// Normally distributed results are generated from pseudorandom generators
/// with a Box-Muller transform, and so require num to be even.
/// Quasirandom generators use an inverse cumulative distribution
/// function to preserve dimensionality. <para/>
/// The normally distributed results are transformed into log-normal distribution.
/// <para/>
/// There may be slight numerical differences between results generated
/// on the GPU with generators created with ::curandCreateGenerator()
/// and results calculated on the CPU with generators created with
/// ::curandCreateGeneratorHost(). These differences arise because of
/// differences in results for transcendental functions. In addition,
/// future versions of CURAND may use newer versions of the CUDA math
/// library, so different versions of CURAND may give slightly different
/// numerical values.
/// </summary>
/// <param name="output">CudaDeviceVariable</param>
/// <param name="mean"></param>
/// <param name="stddev"></param>
public void GenerateLogNormal(CudaDeviceVariable <float> output, float mean, float stddev)
{
_status = CudaRandNativeMethods.curandGenerateLogNormal(_generator, output.DevicePointer, output.Size, mean, stddev);
Debug.WriteLine(String.Format("{0:G}, {1}: {2}", DateTime.Now, "curandGenerateLogNormal", _status));
if (_status != CurandStatus.Success)
{
throw new CudaRandException(_status);
}
}
/// <summary>
/// Use generator to generate num float results into the device memory at
/// outputPtr. The device memory must have been previously allocated and be
/// large enough to hold all the results. Launches are done with the stream
/// set using ::curandSetStream(), or the null stream if no stream has been set.
/// <para/>
/// Results are 32-bit floating point values with log-normal distribution based on
/// an associated normal distribution with mean mean and standard deviation stddev.
/// <para/>
/// Normally distributed results are generated from pseudorandom generators
/// with a Box-Muller transform, and so require num to be even.
/// Quasirandom generators use an inverse cumulative distribution
/// function to preserve dimensionality. <para/>
/// The normally distributed results are transformed into log-normal distribution.
/// <para/>
/// There may be slight numerical differences between results generated
/// on the GPU with generators created with ::curandCreateGenerator()
/// and results calculated on the CPU with generators created with
/// ::curandCreateGeneratorHost(). These differences arise because of
/// differences in results for transcendental functions. In addition,
/// future versions of CURAND may use newer versions of the CUDA math
/// library, so different versions of CURAND may give slightly different
/// numerical values.
/// </summary>
/// <param name="output">CudaDeviceVariable</param>
/// <param name="mean"></param>
/// <param name="stddev"></param>
public void GenerateLogNormal(float[] output, float mean, float stddev)
{
_status = CudaRandNativeMethods.curandGenerateLogNormal(_generator, output, output.LongLength, mean, stddev);
Debug.WriteLine(String.Format("{0:G}, {1}: {2}", DateTime.Now, "curandGenerateLogNormal", _status));
if (_status != CurandStatus.Success)
{
throw new CudaRandException(_status);
}
}