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14 i f nargin == 1
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16 r e t = max( x ) ;
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18 e l s e
19
20 lmax = max( x ) ;
21 gmax = 0 . 0 ;
22 MPI Allreduce ( lmax , gmax , ’MAX’ ,comm ) ;
23 r e t = gmax ;
24
25 end
Purpose
N_VMaxNorm
N_VMaxNorm returns the L-infinity norm of x
Synopsis
function ret = N_VMaxNorm(x, comm)
Description
N_VMaxNorm returns the L-infinity norm of x
Usage: RET = N_VMaxNorm ( X [, COMM] )
If COMM is not present, N_VMaxNorm returns the L-infinity norm
of the local portion of X. Otherwise, it returns the global
L-infinity norm..
Source Code
1 f u n c t i o n r e t = N VMaxNorm( 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 , ’ i n f ’ ) ;
17
18 e l s e
19
20 lnrm = norm ( x , ’ i n f ’ ) ;
21 gnrm = 0 . 0 ;
22 MPI Allreduce ( lnrm , gnrm , ’MAX’ ,comm ) ;
23 r e t = gnrm ;
24
25 end
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