Thread: Nodal points

Hi everyone,
I am working on a code that generates n evenly spaced nodal points from a to b. It runs but I can't get to add interval to itself every iteration, and I am not sure if I got the formula right.
Any ideas? Thanks, I appreciate it.

Sample output should be:

Code:

a = 3
b = 5
n = 5
3  3.5  4  4.5  5

Code is:

Code:

#include <iostream>
using namespace std;

void LineSpace(float a, float b, int n, float arrayOut[]);

int main()
{
	float a = 0.0f, b = 0.0f;
	int n = 0;
	cout << "Enter an interval [a,b] and number of nodal points n. " << endl;
	cout << "Input a = ";
	cin >> a;
	cout << "Input b = ";
	cin >> b;
	cout << "Input n = ";
	cin >> n;
	float* arrayOut = new float[n];
	cout << a;
	LineSpace(a, b, n, arrayOut);
	cout <<  " " << b << endl;
	delete [] arrayOut;
	arrayOut = 0;
}
void LineSpace(float a, float b, int n, float* arrayOut)
{	
	int i = 0;
	float interval = 0.0f;
	for (i = 0; i < n - 2; ++i)
	{
		interval = (b - a)/(n - 1); //<-----formula was originally 
		           //(b-a)/ (n-2); I experimented with (n-1) and
		           //it worked better.. not sure why?!?		
                arrayOut[i] = a + interval;
		cout << " " << arrayOut[i] << " ";
		interval += interval; // <----- doesn't work... this is
		           //supposed to add interval to itself each iteration	
         }
}