Re: Testing if a file (or stream) has been opened? (again)
- To: mathgroup at smc.vnet.net
- Subject: [mg43514] Re: Testing if a file (or stream) has been opened? (again)
- From: Bill Rowe <listuser at earthlink.net>
- Date: Thu, 18 Sep 2003 05:40:13 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 9/17/03 at 7:58 AM, siegman at stanford.edu (AES/newspost) wrote: > Is there a way to accomplish something like the following and get the > desired answer from MemberQ? (Or an alternative approach How about In[1]:= str=OpenWrite["test file"]; MemberQ[First/@Streams[],"test file"] Out[2]= True It is useful to keep in mind virtually everthing in Mathematica can be viewed as an expression with parts and commands like First not only select parts of a list but also select parts of an expression.