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N_VL1Norm returns the L1 norm of x
Usage: RET = N_VL1Norm ( X [, COMM] )
If COMM is not present, N_VL1Norm returns the L1 norm of
the local portion of X. Otherwise, it returns the global
L1 norm..
Source Code
1 f u n c t i o n r e t = N VL1Norm( x ,comm)
9
10 % Radu Serban
11 % Copyright ( c ) 2005 , The Regents o f the U n i v e r s i t y o f C a l i f o r n i a .
12 % $Revision$Date$
13
14 i f nargin == 1
15
16 r e t = norm ( x , 1 ) ;
17
18 e l s e
19
20 lnrm = norm ( x , 1 ) ;
21 gnrm = 0 . 0 ;
22 MPI Allreduce ( lnrm , gnrm , ’MAX’ ,comm ) ;
23 r e t = gnrm ;
24
25 end
Purpose
N_VMax returns the largest element of x
Synopsis
function ret = N_VMax(x,comm)
Description
N_VMax returns the largest element of x
Usage: RET = N_VMax ( X [, COMM] )
N_VMax
If COMM is not present, N_VMax returns the maximum value of
the local portion of X. Otherwise, it returns the global
maximum value.
Source Code
1 f u n c t i o n r e t = N VMax( x ,comm)
9
10 % Radu Serban
11 % Copyright ( c ) 2005 , The Regents o f the U n i v e r s i t y o f C a l i f o r n i a .
12 % $Revision$Date$
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