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

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

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,

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