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```//C# for solving inverse interpolation
using System;
class GFG

{

// Consider a structure to keep

// each pair of x and y together

class Data

{

public double x, y;

public Data(double x, double y)

{

this.x = x;

this.y = y;

}

};

// Function to calculate the

// inverse interpolation

static double inv_interpolate(Data []d,

int n, double y)

{

double x = 0;

int i, j;

for (i = 0; i < n; i++)

{

// Calculate each term

// of the given formula

double xi = d[i].x;

for (j = 0; j < n; j++)

{

if (j != i)

{

xi = xi * (y - d[j].y) /

(d[i].y - d[j].y);

}

}

x += xi;

}

return x;

}

// Driver Code

public static void Main(string[] args)

{

// Sample dataset of 4 points

// Here we find the value

// of x when y = 4.5

Data []d = {new Data(1.27, 2.3),

new Data(2.25, 2.95),

new Data(2.5, 3.5),

new Data(3.6, 5.1)};

// Size of dataset

int n = 4;

// Sample y value

double y = 4.5;

// Using the Inverse Interpolation

// function to find the

// value of x when y = 4.5

Console.Write("Value of x at y = 4.5 : {0:f5}");
Console.Write(inv_interpolate(d, n, y));

}

}```

What I have tried:

```//C# for solving inverse interpolation
using System;
class GFG

{

// Consider a structure to keep

// each pair of x and y together

class Data

{

public double x, y;

public Data(double x, double y)

{

this.x = x;

this.y = y;

}

};

// Function to calculate the

// inverse interpolation

static double inv_interpolate(Data []d,

int n, double y)

{

double x = 0;

int i, j;

for (i = 0; i < n; i++)

{

// Calculate each term

// of the given formula

double xi = d[i].x;

for (j = 0; j < n; j++)

{

if (j != i)

{

xi = xi * (y - d[j].y) /

(d[i].y - d[j].y);

}

}

x += xi;

}

return x;

}

// Driver Code

public static void Main(string[] args)

{

// Sample dataset of 4 points

// Here we find the value

// of x when y = 4.5

Data []d = {new Data(1.27, 2.3),

new Data(2.25, 2.95),

new Data(2.5, 3.5),

new Data(3.6, 5.1)};

// Size of dataset

int n = 4;

// Sample y value

double y = 4.5;

// Using the Inverse Interpolation

// function to find the

// value of x when y = 4.5

Console.Write("Value of x at y = 4.5 : {0:f5}");
Console.Write(inv_interpolate(d, n, y));

}

}```
Posted
Updated 26-Mar-23 14:38pm

## Solution 2

You tried nothing.
A good starting point could be: Python Classes[^].

Maciej Los 3-Mar-22 7:57am
5ed!
CPallini 3-Mar-22 8:35am
Thank you, Maciej!

## Solution 1

There is an online tool available, you can try yourself
Convert C# to Python - A free code conversion tool - developer Fusion[^]

v2