Hello, I'm at the end of my first programming course and I have to say I'm stumped in the final problem assigned.
The problem is to solve the equation of a thermocouple device using various voltages and temperatures inputted by the user.
The linear equation for solving T is a*V +b were we solve for coefficients a and b.
T is temperature, V is voltage and a and b are computed using the following formulas.
a = (n*(E(Vi*Ti)) - (EVi) * (ETi) /(n*(EVi*Vi)) - (EVi)^2)
b = (ETi-(a*EVi))/n
n is the number of measurements which is MAX in the code.
Vi and Ti are measured values of voltages and temperatures
E stands for sigma or sum of operator.(I'm not sure if there is a character symbol for it).
CODE
#include <iostream>
#include <vector>
#include <cmath>
using namespace std;
int main()
{
int MAX;
cout << "How many data points will be placed? ";
cin >> MAX;
vector<double> volt (MAX);
vector<double> temp (MAX);
for(int i = 0; i < MAX; i++)
{
cout << "Enter the volts\n";
cin >> volt[i];
cout << "Enter the temp\n";
cin >> temp[i];
}
//loop for voltage
double addvolts = 0;
for(i = 0; i < MAX; i++)
{
addvolts+= volt[i];
}
cout << "Total volts " << addvolts << endl;
//loop for temperature
double addtemp = 0;
for(i = 0; i < MAX; i++)
{
addtemp+= temp[i];
}
cout << "Total temperature " << addtemp << endl;
double x;
/*
Sequence of EVi*Vi were E is sigma
//loop for Vi*Vi
for(i = 0; i< MAX; i++)
{
x += volt[i];
}
cout << "X is equal to " << x << endl;
*/
//space here for final loop
double v;
v = addvolts;
double t;
t = addtemp;
double n = MAX * 2;
double a;
a = ((n * (v * t)) - (((v) * (t))) / ((n*x))-(pow(v, 2)));
double b;
b = (t - (a * (v))) / n;
cout << "T = " << a << "*V + " << b << endl;
/*
Used later to test equation
double V;
double T;
cout << "**TEST**\n";
cout << "Enter the volts\n";
cin >> V;
T = (a*V) + b;
cout << "The temperature is " << T << endl;
*/
system ("pause");
return 0;
}
This is what I have so far. It might be because I haven't taken a math course in a while but I'm getting stumped making a loop for the sequence of EVi*Vi and EVi*Ti.
From the code I made that section in comment which is this one
CODE
double x;
/*
Sequence of EVi*Vi where E is sigma
//loop for Vi*Vi
for(i = 0; i< MAX; i++)
{
x += volt[i];
}
cout << "X is equal to " << x << endl;
*/
Which I then added to the initial loop x = volt[i] *volt[i] since from my understanding EVi*Vi would be the first voltage inputted multiplied by itself and then added to the next voltage inputted that was multiplied by itself. Which would be Voltage1*Voltage1 + Voltage2*Voltage2 from my understanding of it.
Unfortunatly adding x= volt[i]*volt[i] to initial loop didn;t work.
CODE
for(int i = 0; i < MAX; i++)
{
cout << "Enter the volts\n";
cin >> volt[i];
// x=volt[i]*volt[i]
cout << "Enter the temp\n";
cin >> temp[i];
}
I was thinking that maybe I would have to make two seperate loops one to multiply them and another one to add that result?Something likeVi * Vi could be x*x. Thats why I'm using the x variable.
And for the final loop which is E(Vi*Ti) from my understanding it is Voltage1*Temperature1 + Voltage2*Temperature2 etc.. Which would make sense but a classmate informed me it was V1+T1*V2+T2? I'm not totally to sure on this one due to my lack of understanding of sequences.
I apologize for making this too long and rather confusing. If need be I will clarify any point or if I can find a scanner somewhere around I could try scanning the actual problem if my poor description isn't clear enough.
Any guidance as to what I could do next would be appreciated.
Thank you.
14 Dec, 2005 - 10:24 AM
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