ynf

Applicability

Function Usage

Obtains the value of the nth-order second-type Bessel function yn of the input data x.

Prototype

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inline float ynf(int n, float x)

Parameters

Returns

The value of the second-type Bessel function yn of the input data.

• If n is less than 0, the return value is nan.
• If x is 0, the return value is -inf.
• If x is less than 0, the return value is nan.
• If x is inf, the return value is 0.
• If x is nan, the return value is nan.

Restrictions

• When this API is used, the number of configured threads cannot exceed 256. Otherwise, stack overflow may occur.
• The maximum value of n is 128.
• For SIMT programming, this API is not supported.

Header File to Be Included

To use this API, the simt_api/math_functions.h header file must be included.

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#include "simt_api/math_functions.h"

Examples

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__simt_vf__ __launch_bounds__(256) inline void KernelYn(__gm__ float* dst, __gm__ int* n, __gm__ float* x)
{
    int idx = threadIdx.x + blockIdx.x * blockDim.x;
    dst[idx] = ynf(n[idx], x[idx]);
}