Problem with function inside forloop

oobie2142 (5)
Im having problems with using a function in a forloop. i keep getting an error saying its not declared in the scope.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
 
#include <iostream>
#include <vector>
#include <fstream>
#include<cmath>
#include<math.h>
#define PI 3.14
#define R .1
#define C 1.0
#define h .05
#define tend 1.0
#define a tend/h
using namespace std;

double inputvoltage(double x);

int main()
{

ofstream myfile;
myfile.open ("example2.txt");




vector<double> volt (a);

vector<double> k1 (a);
vector<double> k2 (a);
vector<double> k3 (a);
vector<double> k4 (a);
cout<<"enter an initial condition "<<endl;
cin>>volt[0];

cout<<"time,t" <<"\t"<< "voltage,v "<<endl;

for(int i = 0; i<=20 ; i ++)
{

k1[i] = (inputvoltage(i) - volt[i])/(R*C);

k2[i] = (inputvoltge(i) - (volt[i] + (.5*h*k1[i])))/(R*C);

k3[i] = (inputvoltage(i) - (volt[i] + (.5*h*k2[i])))/(R*C);

k4[i] = (inputvoltage(i) - (volt[i] + h))/(R*C);

volt[i+1] = volt[i] + ((h/6)*(k1[i] + 2*k2[i] + 2*k3[i] + k4[i]));

cout<<i*h<<"\t"<<volt[i]<<endl;

myfile<<i*h<<"\t"<<volt[i]<<endl;

}
myfile.close();


    return 1;
}

double inputvoltage( double x )
{

    double v = 0 ;

        v = (10* exp(-1*x*h/.05))*sin(2*PI*x*h/.03);



  return v;
}
oonej (208)
you have a typo on line 41

k2[i] = (inputvoltge(i) - (volt[i] + (.5*h*k1[i])))/(R*C);

you forgot the A in voltage
oobie2142 (5)
damn sorry its late. ha
Topic archived. No new replies allowed.