
March 6th, 2010, 02:52 AM
#1
Help on evaluating functions.
Good day everyone.
I need your help.
I have this problem involving a function evaluation.
Let's say F is a mathematical function of multiple variables, and each variable has a discrete number of values.
For example: F(a,b,c)=(a+b)/c
and a={1,2,3) b={3,5,6) and c={8,9,7}
so F(1,3,8)=(1+3)/8=0.5
In my problem, F is a function of 7 variables. and each variable has a specific number of allowed values, how will I be able to solve all the possible F values? this could be easily done manually for a small number of combinations, but how about for large numbers of possible combinations.
thank you very much!

March 6th, 2010, 02:19 PM
#2
Re: Help on evaluating functions.
put all the allowable values per variable into a vector or list, then iterate over all of them. e.g:
(untested)
Code:
#include <iostream>
#include <vector>
using namespace std;
float func(float a, float b, float c)
{
return (a + b) / c;
}
int main()
{
vector<float> theAs;
vector<float> theBs;
vector<float> theCs;
theAs.push_back(1);
theAs.push_back(2);
theAs.push_back(3);
theBs.push_back(3);
theBs.push_back(5);
theBs.push_back(6);
theCs.push_back(7);
theCs.push_back(8);
theCs.push_back(9);
vector<float>::iterator itA = theAs.begin();
vector<float>::iterator itB = theBs.begin();
vector<float>::iterator itC = theCs.begin();
for(; itA != theAs.end(); ++itA)
{
for(; itB != theBs.end(); ++itB)
{
for(; itC != theCs.end(); ++itC)
{
cout << func(*itA, *itB, *itC) << endl;
}
}
}
}
Tags for this Thread
Posting Permissions
 You may not post new threads
 You may not post replies
 You may not post attachments
 You may not edit your posts

Forum Rules

Click Here to Expand Forum to Full Width
This is a CodeGuru survey question.
Featured
