Re: slot argument weirdness

*To*: mathgroup at smc.vnet.net*Subject*: [mg83929] Re: slot argument weirdness*From*: Tom Burton <news at brahea.com>*Date*: Wed, 5 Dec 2007 07:02:13 -0500 (EST)

Considering that all the examples of slots in online help (Slot) show slots inside of pure functions, where is the weirdness: in the slots, or in your attempt to use them outside their native habitat? You're so close :-) How about? m={{#1,#2},{#2,#1}}&; Apply[m, v] Simple pure functions are fine, but complex ones can be hard to read. How about instead a regular function, m=Function[{u,v},{{u,v},{v,u}}] or a rule? r={u_,v_}:>{{u,v},{v,u}}; v/.r Tom When responding, please replace news with my first initial and full last name, as one word. Tom Burton > I have to produce some bulky matrices which are described by two > parameters and it seems the easiest way to produce them is as > follows (I took out all the complexity and just left in the slots > to illustrate my problem). v is the parameter array. > > v = {2, 5}; > > ... but since the actual form in the first argument in Apply is > really a large messy thing, I thought I'd produce it just once in > the notebook and represent it with: > > m = {{#1, #2}, {#2, #1}}; > > But geez, this doesn't work at all ...