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SwRI can revise these Terms at any time * without notice by updating this posting. * * Trademarks * * The SwRI logo is a trademark of SwRI in the United States and other countries. * */ #ident "@(#) textract.c 1.2 05/08/19 SwRI" #include "libbase_idfs.h" #include "user_defs.h" /******************************************************************************* * * * EXTRACT_SINGLE_ELEMENT_FROM_IDFS_TENSOR SUBROUTINE * * * * DESCRIPTION * * This routine is called to extract a single element from the tensor * * provided as the first argument and to store the extracted element into the * * resultant variable. The user must specify the start index location within * * each defined dimension for the tensor at which the extraction is to take * * place. With tensor data, there are 2 sets of data that are returned by the* * read_tensor_data() routine in the tensor_data structure. One set of data * * are the raw integer values stored within the data record. The other set * * of data are the floaing point values that result from transferring the * * integer raw values into the the data type defined in the VIDF (d_type). * * * * INPUT VARIABLES * * SDDAS_SHORT tensor_rank the rank of the tensor being processed * * SDDAS_ULONG *tnext_dimen pointer to array that holds no. of data * * values to bypass in order to get to next * * index for a given dimension ([0] = first * * dimension or slowest varying dimension) * * void *tensorA pointer to the input tensor data * * SDDAS_ULONG *element_indices indices for each tensor dimension so the * * single element of the tensor can be indexed * * void *ret_ptr pointer to the resultant * * SDDAS_CHAR long_dtype flag indicating if integer or floating point * * input/return values * * * * USAGE * * extract_single_element_from_idfs_tensor (tensor_rank, &tnext_dimen, * * &tensorA, &element_indices, &ret_ptr, long_dtype) * * * * NECESSARY SUBPROGRAMS * * None * * * * EXTERNAL VARIABLES * * None * * * * INTERNAL VARIABLES * * reg SDDAS_SHORT loop looping variable * * SDDAS_FLOAT *fret_ptr floating pt. pointer to resultant * * SDDAS_FLOAT *ftensor floating pt. pointer to input tensor * * SDDAS_ULONG ind index value into the tensor * * SDDAS_LONG *lret_ptr integer pointer to resultant * * SDDAS_LONG *ltensor integer pointer to input tensor * * SDDAS_SHORT stop_loop number of values to be returned in resultant * * * * SUBSYSTEM * * Display Level * * * ******************************************************************************/ void extract_single_element_from_idfs_tensor (SDDAS_SHORT tensor_rank, SDDAS_ULONG *tnext_dimen, void *tensorA, SDDAS_ULONG *element_indices, void *ret_ptr, SDDAS_CHAR long_dtype) { register SDDAS_SHORT loop; SDDAS_FLOAT *fret_ptr, *ftensor; SDDAS_ULONG ind; SDDAS_LONG *lret_ptr, *ltensor; SDDAS_SHORT stop_loop; /******************************************************************/ /* Determine the index needed to get to the single element being */ /* extracted. For the fastest changing index, simply add the */ /* offset value passed in by the calling routine. */ /******************************************************************/ stop_loop = tensor_rank - 1; for (ind = 0, loop = 0; loop < stop_loop; ++loop) ind += *(element_indices + loop) * *(tnext_dimen + loop); ind += *(element_indices + stop_loop); if (long_dtype) { lret_ptr = (SDDAS_LONG *) ret_ptr; ltensor = (SDDAS_LONG *) tensorA; *lret_ptr = *(ltensor + ind); } else { fret_ptr = (SDDAS_FLOAT *) ret_ptr; ftensor = (SDDAS_FLOAT *) tensorA; *fret_ptr = *(ftensor + ind); } }