1. Aug 19, 2011

### sciencecrazy

A = (2n-2 +2n-3+ {n-4i=0 [(-1) n-1-i ]*[2i] } )*B/(2n-2n-1- 2n-2-{n-3i=0 [((-1)n-i ) *2i]})

maybe taking b along x axis, n along y axis and a along z axis.
Please post few software or utility name to help me out. But it would be equally useful if someone gives the plotted graph itself.

** if any one of you around has SCILAB please post some code for plotting this function.
The basic problem i face is how am i supposed to add summation/sigma ?

Last edited: Aug 19, 2011
2. Aug 21, 2011

### jackmell

Your notation is a little ambiguous. Here's what I think it is:

$$a[\text{n\_},\text{b\_}]\text{:=}\left(2^{n-2}+2^{n-3}+\left(\sum _{i=0}^{n-4} \left((-1)^{n-1-i}\right) 2^i\right) \right)\frac{b}{2^n-2^{n-1}-2^{n-3}-\sum _{i=0}^{n-3} \left(\left((-1)^{n-1} 2^i\right)\right)}$$

No way you can hook-up with a machine running Mathematica? Try and find one:

I'll leave it up to you to run the code if you wish.

Last edited: Aug 21, 2011
3. Aug 21, 2011