Memory is memory. It doesn't have to track the contents of the pari block to notice clobbering happening outside it.
Sure -- but that's not the problem (and it won't be the problem). Every time the library uses the stack it ensures that there's room for what it's creating. Also, the stack is very large -- at least 20 MB and sometimes as big as 1 GB, with its pointer avma moving by [only] several bytes per call.
The real problem with memory management is leaving garbage on the stack (another possibility is returning corrupted objects). The usual technique for is
which ensures that you're not leaving garbage on the stack. But this is somewhat more complicated by returning complicated objects like vectors. For example:
Memory diagram:
(vector with pointers to its members A, B, and C)(A)(garbage)(B)(garbage)(C)
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peter (1 Reply)
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Discussion started by: andrew.p.mcderm
4 Replies
LEARN ABOUT CENTOS
srscl
srscl.f(3) LAPACK srscl.f(3)NAME
srscl.f -
SYNOPSIS
Functions/Subroutines
subroutine srscl (N, SA, SX, INCX)
SRSCL multiplies a vector by the reciprocal of a real scalar.
Function/Subroutine Documentation
subroutine srscl (integerN, realSA, real, dimension( * )SX, integerINCX)
SRSCL multiplies a vector by the reciprocal of a real scalar.
Purpose:
SRSCL multiplies an n-element real vector x by the real scalar 1/a.
This is done without overflow or underflow as long as
the final result x/a does not overflow or underflow.
Parameters:
N
N is INTEGER
The number of components of the vector x.
SA
SA is REAL
The scalar a which is used to divide each component of x.
SA must be >= 0, or the subroutine will divide by zero.
SX
SX is REAL array, dimension
(1+(N-1)*abs(INCX))
The n-element vector x.
INCX
INCX is INTEGER
The increment between successive values of the vector SX.
> 0: SX(1) = X(1) and SX(1+(i-1)*INCX) = x(i), 1< i<= n
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 85 of file srscl.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 srscl.f(3)