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August 26th, 2016, 06:16 AM  #1 
Newbie Joined: Aug 2016 From: india Posts: 1 Thanks: 0  Can you find some relation
hey everyone , I am writing a computer program but I am stuck somewhere If you can find any logic or relation between the following data so I can handle of them in one single statement ? i j 1 2 2 5 3 3 4 1 5 4 
August 26th, 2016, 07:34 AM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,406 Thanks: 1307 
Even if there is some arcane input output relationship between these two arrays it's fairly poor programming to try and force some sort of mathematical formula to describe it. With hardware resources being a mostly insignificant concern these days clarity is a more important property of good code. how about this statement... (in C) j = switch { case 1 : 2; case 2 : 5; case 3 : 3; case 4 : 1; case 5 : 4; default : printf(stderr, "Undefined input\n"); } or a more typical way of doing this is with an array. int f = {2,5,3,1,4}; j = f[i+1]; Last edited by romsek; August 26th, 2016 at 07:47 AM. 
August 26th, 2016, 07:37 AM  #3 
Senior Member Joined: Dec 2013 From: some subspace Posts: 212 Thanks: 72 Math Focus: real analysis, vector analysis, numerical analysis, discrete mathematics 
If one really wish to write a formula for it, maybe $\displaystyle j = \frac{5}{6}i^3  7\tfrac{1}{2}i^2 + 19\tfrac{2}{3}i  11$ works.

September 8th, 2016, 04:59 AM  #4 
Senior Member Joined: Aug 2016 From: morocco Posts: 273 Thanks: 32 
2+3*(i1)5/20*(i1)(i2)+5/6*(i1)(i2)(i3). we use finite differences of Newton method of polynomial interpolation. 

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