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backsub
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1994-09-05
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645b
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26 lines
backsub:
Syntax: backsub ( LIST, B )
Description:
The backsub function computes the solution to the set of
linear equations described by:
A * X = B
The 1st argument to backsub (LIST) is the result from
`factor(A)'. The second argument to backsub is the matrix B. B
can contain multiple right hand sides.
Backsub returns a matrix X which contains the solution(s) to
the aforementioned equations.
Backsub utilizes the LAPACK subroutines DGETRS or ZGETRS if
LIST contains LU factors or LAPACK subroutins DSYTRS or ZHETRS
if LIST contains the LDL factors.
Example: X = backsub (factor (A), B);
See Also: factor, inv, lu, solve