Using Block instead of Module?
- To: mathgroup at smc.vnet.net
- Subject: [mg24251] Using Block instead of Module?
- From: d8442803 at student.nsysu.edu.tw (Wen-Feng Hsiao)
- Date: Tue, 4 Jul 2000 15:22:12 -0400 (EDT)
- Organization: NSYSU
- Sender: owner-wri-mathgroup at wolfram.com
Dear listers,
I try to output results to a file whose name is variable, and find Module
statement cannot fulfill this purpose, only Block can do. For example,
outputTest[lst_List, id_Integer] := Module[{fname, tmp = lst},
fname = ToString[id] <> ".txt";
ToExpression["tmp >>" <> fname];
];
outputTest[{1, 2, 3}, 3]
The output file is 3.txt, but the content is "tmp". But if I change
Module statement into Block as below:
outputTest[lst_List, id_Integer] := Block[{fname, tmp = lst},
fname = ToString[id] <> ".txt";
ToExpression["tmp >>" <> fname];
];
outputTest[{1, 2, 3}, 3]
The output file is 3.txt, and the content is correct, {1, 2, 3}. How if
one used to use Module, like me, should do for the same purpose?
Wen-Feng