Developer Reference

  • 2020
  • 07/15/2020
  • Public Content
Contents

FindNearest

Finds table elements that are closest to the elements of the specified vector.

Syntax

IppStatus ippsFindNearest_16u(const Ipp16u*
pVals
, Ipp16u*
pOutVals
, int*
pOutIndexes
, int
len
, const Ipp16u
*pTable
, int
tblLen
);
Include Files
ipps.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
Libraries:
ippcore.lib
,
ippvm.lib
Parameters
pVals
Pointer to the vector containing reference values.
pOutVals
Pointer to the output vector.
pOutIndexes
Pointer to the array that stores output indexes.
len
Number of elements in the input vector.
pTable
Pointer to the table for searching.
tblLen
Number of elements in the table.
Description
This function searches through the table
pTable
for elements which are closest to the reference elements of the input vector
pVals
. The resulting elements and their indexes are stored in
pOutVals
and
pOutIndexes
, respectively. The table elements must satisfy the condition
pTable
[n]
pTable
[n+1]
. The function uses the following distance criterion for determining the table element closest to
pVals
[k]
:
min(|
pVals
[k] -
pTable
[n]|)
.
Return Values
ippStsNoErr
Indicates no error.
ippStsNullPtrErr
Indicates an error when at least one of the specified pointers is
NULL
.
ippStsSizeErr
Indicates an error when
tblLen
or
len
is less than or equal to zero.

Example

/******************************************************************************* * Copyright 2015-2020 Intel Corporation. * * This software and the related documents are Intel copyrighted materials, and * your use of them is governed by the express license under which they were * provided to you (License). Unless the License provides otherwise, you may not * use, modify, copy, publish, distribute, disclose or transmit this software or * the related documents without Intel's prior written permission. * * This software and the related documents are provided as is, with no express * or implied warranties, other than those that are expressly stated in the * License. *******************************************************************************/ #include <stdio.h> #include "ipp.h" /* Next two defines are created to simplify code reading and understanding */ #define EXIT_MAIN exitLine: /* Label for Exit */ #define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) Integrated Primitives (Intel(R) IPP) function returned status different from ippStsNoErr */ /* Results of ippMalloc() are not validated because Intel(R) IPP functions perform bad arguments check and will return an appropriate status */ int main() { Ipp16u pVals[] = { 12, 6, 78 }; Ipp16u pTable[] = { 1, 3, 5, 7, 18, 24, 35, 48 }; Ipp16u pOutVals[3]; int pOutIndexes[3]; IppStatus status; int i; printf("Source table\n"); for (i = 0; i < 8; i++) printf("%d ", pTable[i]); printf("\nSource vector\n"); for (i = 0; i < 3; i++) printf("%d ", pVals[i]); check_sts(status = ippsFindNearest_16u(pVals, pOutVals, pOutIndexes, 3, pTable, 8)); printf("\nResult values vector\n"); for (i = 0; i < 3; i++) printf("%d ", pOutVals[i]); printf("\nResult indexes vector\n"); for (i = 0; i < 3; i++) printf("%d ", pOutIndexes[i]); EXIT_MAIN printf("\nExit status %d (%s)\n", (int)status, ippGetStatusString(status)); return (int)status; }

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804