.TH "dlasd0.f" 3 "Wed Oct 15 2014" "Version 3.4.2" "LAPACK" \" -*- nroff -*-
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.SH NAME
dlasd0.f \- 
.SH SYNOPSIS
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.SS "Functions/Subroutines"

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.RI "subroutine \fBdlasd0\fP (N, SQRE, D, E, U, LDU, VT, LDVT, SMLSIZ, IWORK, WORK, INFO)"
.br
.RI "\fI\fBDLASD0\fP computes the singular values of a real upper bidiagonal n-by-m matrix B with diagonal d and off-diagonal e\&. Used by sbdsdc\&. \fP"
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.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine dlasd0 (integerN, integerSQRE, double precision, dimension( * )D, double precision, dimension( * )E, double precision, dimension( ldu, * )U, integerLDU, double precision, dimension( ldvt, * )VT, integerLDVT, integerSMLSIZ, integer, dimension( * )IWORK, double precision, dimension( * )WORK, integerINFO)"

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\fBDLASD0\fP computes the singular values of a real upper bidiagonal n-by-m matrix B with diagonal d and off-diagonal e\&. Used by sbdsdc\&.  
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\fBPurpose: \fP
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.nf
 Using a divide and conquer approach, DLASD0 computes the singular
 value decomposition (SVD) of a real upper bidiagonal N-by-M
 matrix B with diagonal D and offdiagonal E, where M = N + SQRE.
 The algorithm computes orthogonal matrices U and VT such that
 B = U * S * VT. The singular values S are overwritten on D.

 A related subroutine, DLASDA, computes only the singular values,
 and optionally, the singular vectors in compact form.
.fi
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.RE
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\fBParameters:\fP
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\fIN\fP 
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          N is INTEGER
         On entry, the row dimension of the upper bidiagonal matrix.
         This is also the dimension of the main diagonal array D.
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\fISQRE\fP 
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          SQRE is INTEGER
         Specifies the column dimension of the bidiagonal matrix.
         = 0: The bidiagonal matrix has column dimension M = N;
         = 1: The bidiagonal matrix has column dimension M = N+1;
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\fID\fP 
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          D is DOUBLE PRECISION array, dimension (N)
         On entry D contains the main diagonal of the bidiagonal
         matrix.
         On exit D, if INFO = 0, contains its singular values.
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\fIE\fP 
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          E is DOUBLE PRECISION array, dimension (M-1)
         Contains the subdiagonal entries of the bidiagonal matrix.
         On exit, E has been destroyed.
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\fIU\fP 
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          U is DOUBLE PRECISION array, dimension at least (LDQ, N)
         On exit, U contains the left singular vectors.
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\fILDU\fP 
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          LDU is INTEGER
         On entry, leading dimension of U.
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\fIVT\fP 
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          VT is DOUBLE PRECISION array, dimension at least (LDVT, M)
         On exit, VT**T contains the right singular vectors.
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\fILDVT\fP 
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          LDVT is INTEGER
         On entry, leading dimension of VT.
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\fISMLSIZ\fP 
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          SMLSIZ is INTEGER
         On entry, maximum size of the subproblems at the
         bottom of the computation tree.
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\fIIWORK\fP 
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          IWORK is INTEGER work array.
         Dimension must be at least (8 * N)
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\fIWORK\fP 
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          WORK is DOUBLE PRECISION work array.
         Dimension must be at least (3 * M**2 + 2 * M)
.fi
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\fIINFO\fP 
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          INFO is INTEGER
          = 0:  successful exit.
          < 0:  if INFO = -i, the i-th argument had an illegal value.
          > 0:  if INFO = 1, a singular value did not converge
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.RE
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\fBAuthor:\fP
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Univ\&. of Tennessee 
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Univ\&. of California Berkeley 
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Univ\&. of Colorado Denver 
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NAG Ltd\&. 
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\fBDate:\fP
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September 2012 
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\fBContributors: \fP
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Ming Gu and Huan Ren, Computer Science Division, University of California at Berkeley, USA 
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Definition at line 152 of file dlasd0\&.f\&.
.SH "Author"
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Generated automatically by Doxygen for LAPACK from the source code\&.