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//------------------------------------------------------------------------------
// GxB_Matrix_reshape: reshape a matrix in place
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// GxB_Matrix_reshape changes the dimensions of a matrix, reshaping the entries
// by row or by column.
// For example, if C is 3-by-4 on input, and is reshaped by column to have
// dimensions 2-by-6:
// C on input C on output (by_col true)
// 00 01 02 03 00 20 11 02 22 13
// 10 11 12 13 10 01 21 12 03 23
// 20 21 22 23
// If the same C on input is reshaped by row to dimesions 2-by-6:
// C on input C on output (by_col false)
// 00 01 02 03 00 01 02 03 10 11
// 10 11 12 13 12 13 20 21 22 23
// 20 21 22 23
// If the input matrix is nrows-by-ncols, and the size of the reshaped matrix
// is nrows_new-by-ncols_new, then nrows*ncols must equal nrows_new*ncols_new.
// The format of the input matrix (by row or by column) is unchanged; this
// format need not match the by_col input parameter.
#include "GB.h"
#include "GB_reshape.h"
GrB_Info GxB_Matrix_reshape // reshape a GrB_Matrix in place
(
// input/output:
GrB_Matrix C, // input/output matrix, reshaped in place
// input:
bool by_col, // true if reshape by column, false if by row
GrB_Index nrows_new, // new number of rows of C
GrB_Index ncols_new, // new number of columns of C
const GrB_Descriptor desc // to control # of threads used
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_WHERE1 ("GxB_Matrix_reshape (C, nrows_new, ncols_new, desc)") ;
GB_BURBLE_START ("GxB_Matrix_reshape") ;
GB_RETURN_IF_NULL_OR_FAULTY (C) ;
GB_GET_DESCRIPTOR (info, desc, xx1, xx2, xx3, xx4, xx5, xx6, xx7) ;
//--------------------------------------------------------------------------
// reshape the matrix
//--------------------------------------------------------------------------
info = GB_reshape (NULL, C, by_col, nrows_new, ncols_new, Context) ;
GB_BURBLE_END ;
return (info) ;
}
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