Unevaluated values of a[[i]]+b[[j]]

*To*: mathgroup at smc.vnet.net*Subject*: [mg65211] Unevaluated values of a[[i]]+b[[j]]*From*: "Alexandre Costa" <amscosta at uem.br>*Date*: Sat, 18 Mar 2006 06:40:33 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Dear group, Suppose a have a = {3,4,4} and b = {4,3,8}. I want to see the Unevaluated numerics values of a[[i]]*b[[j]], a[[i]]+b[[j]], a[[i]]/b[[j]], a[[i]] - b[[j]]. The NonCommutativeMultiply operator (**) solves the case of a[[i]]*b[[j]]. But suppose I want to extend that NonCommutativeMultiply operator (**) to others operations: +, -, / , i.e., see the Unevaluated numeric values of a[[i]]+b[[j]], a[[i]]/b[[j]], a[[i]] - b[[j]]. Does anybody have a clue how to do this ? Suppose I have the expression for the roots of the quadratic equation: - b[[index]]^2 + Sqrt[delta]/2*a[[index]] How can I see at once all the numeric values unevaluated on that expression. In short words, I have lenghtly expressions(with sums,subtraction,divisions and multiplications and powers) and I want to check each numeric value of each term in the original unevaluated formula containing elements such as a[[index]] . I was thinking in a operator or function to solve all this issue. Any help is very welcome, Thanks, Alex

**Follow-Ups**:**Re: Unevaluated values of a[[i]]+b[[j]]***From:*János <janos.lobb@yale.edu>