Direct Memory Replacing in Array
- To: mathgroup at smc.vnet.net
- Subject: [mg46823] Direct Memory Replacing in Array
- From: jeremytfox at yahoo.com (Jeremy Fox)
- Date: Tue, 9 Mar 2004 04:31:13 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
The Mathematica syntax mat = ReplacePart[mat,new,index] is clean. However, it probably involves a complete replacing of the entire, old mat with the entire new mat, in memory. This operation is expensive if the user is interested in changing only a small part of a large array mat. Is there a way to change small numbers of elements in an array without requiring the other elements to be copied again? This is how low-level languages such a C and Fortran work. Jeremy