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35 lines
865 B
Matlab
35 lines
865 B
Matlab
% ********************************************************************
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% Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
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% ********************************************************************
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function A = spdiag( d, idiag )
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% A = spdiag( d, idiag )
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%
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% Generate a sparse matrix based on the diagonal
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% This is similar to "diag" but returns
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% a sparse matrix instead of a dense matrix
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n = length(d);
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m = n + abs(idiag);
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if (idiag >= 0),
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% ----------------------
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% upper triangular part
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% ----------------------
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i1 = 1;
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i2 = min(m,i1 + n - 1);
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j1 = min(m,1 + idiag);
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j2 = min(m,j1 + n -1 );
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else
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% -----------------------
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% lower triangular part
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% -----------------------
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i1 = min(m,1 + abs(idiag));
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i2 = min(m, i1 + n - 1);
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j1 = 1;
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j2 = min(m, j1 + n - 1);
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end;
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A = sparse( i1:i2, j1:j2, d, m,m );
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