Re: Table local

*To*: mathgroup at smc.vnet.net*Subject*: [mg113809] Re: Table local*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Sun, 14 Nov 2010 06:07:43 -0500 (EST)

http://reference.wolfram.com/mathematica/ref/Table.html "Table[expr, spec] first evaluates spec, then localizes the variable specified, and successively assigns values to it, each time evaluating expr." In other words, what is localized is the index i Clear[i, u]; Table[u = i^2, {i, 5}]; {i, u} {i, 25} Clear[i, u]; u = 0; Table[u += i^2, {i, 5}]; {i, u} u == Sum[i^2, {i, 5}] {i, 55} True Bob Hanlon ---- EF <he.frauendorfer at t-online.de> wrote: ============= "Help, More Information" for Table states: Table effectively uses Block to localize values or variables. But Clear[u]; Table[u = i^2, {i, 5}]; u Clear[u]; Table[u = i^2;, {i, 5}]; u In both cases the value 25 for u is given. If u were really local, it should have no value outside of the Table For me there is a contradiction that can cause a lot of trouble E. F.