In this Python tutorial, we will learn about the “**Scipy Integrate**” where we will learn about how to use the integration method to solve integration problems. And additionally, we will cover the following topics.

- Scipy Integrate
- Scipy Integrate Simpson
- Scipy Integrate Trapzoid
- Scipy Integrate Quad
- Scipy Integrate Odeint
- Scipy Integrate Solve_Ivp
- Scipy Integrate CumTrapz

## Scipy Integrate

The Scipy submodule

contains the many methods to solve problems related to integrations or differential equations in Python. It has a predefined function and method to solve the integration or differential equation mathematics problems.*scipy.integrate*

To know the available integration techniques within this submodule, use the below code.

```
from scipy import integrate
print(help(integrate))
```

In the above output, when we will scroll through, then it shows all the integration or differential techniques, methods, and functions in this module.

Read: Scipy Stats – Complete Guide

## Scipy Integrate Trapzoid

The

rule is an integration technique that evaluates the area under the curve by dividing the total area into a smaller trapezoid. It integrates a given function *TrapeZoid*

based on a specified axis.*y(x)*

The syntax for using it in Python is given below.

`scipy.integrate.trapezoid(y, x=None, dx=1.0, axis=- 1)`

Where parameters are:

It represents the array that we want to integrate as input.*y(array_data):*It is used to specify the sample points that relate to y values.*x(array_data):*It is used to specify the space between sample points when the*dx(scalar):*

isn’t used.*x*It defines the on which axis we want to perform the integration.*axis(int):*

The method

returns the value *trapezoid()*

of type float which is approximated integral value.*trapz*

Let’s take an example by following the below steps in Python:

Import the required libraries.

`from scipy.integrate import trapezoid`

Create array values that represent the

data and pass it to the method.*y*

`trapezoid([5,8,10])`

The output shows the integration value

by applying the trapezoid rule.*15.5 *

Read: Scipy Misc + Examples

## Scipy Integrate Simpson

The Scipy has a method

that calculates the approximate value of an integral. This method exists in the*simpson()*** **submodule

*scipy.integrate*

.The syntax for using it in Python is given below.

`scipy.integrate.simpson(y, x=None, dx=1.0, axis=- 1, even='avg')`

Where parameters are:

It represents the array that we want to integrate as input.*y(array_data):*It is used to specify the sample points that relate to y values.*x(array_data):*It is used to specify the space between sample points when the*dx(scalar):*

isn’t used.*x*It defines the on which axis we want to perform the integration.*axis(int):*It is used to specify the trapezoidal rule on the average of two results, the first and the last interval.*even(string):*

Let’s take an example using the below steps:

Import the required module as shown below code.

```
import numpy as np
from scipy.integrate import simpson
```

Create an array of data and sample points using the below code.

```
array_data = np.arange(5,15)
sample_pnt = np.arange(5,15)
```

Use the below Python code to calculate the integration using the method

.*simpson()*

`simpson(array_data,sample_pnt)`

The output shows the integral value of the array and the given sample points are ** 85.5**.

Read: Scipy Rotate Image + Examples

## Scipy Integrate Quad

The Scipy has a method

in the submodule *quad()*

that calculate the definite integral of a given function from infinite interval a to b in Python.*scipy.integrate*

The syntax is given below.

`scipy.integrate.quad(func, a, b, args=(), full_output=0)`

Where parameters are:

It is used to specify the function that is used for the computation of integration. The function can be one of the following forms.*func(function):*

- double func(double y)
- double func(double y, void *user_data)
- double func(int m, double *yy)
- double func(int m, double *yy, void *user_data)

Used to specify the lower limit of integration.*a(float):*Used to specify the upper limit of integration.*b(float):*If we want to pass extra arguments to a function, then use this parameter.*args(tuple):*Non-zero value is used to get the dictionary of integration information.*full_output(int):*

The method returns three important results

the integral value, *y*

the estimate of the absolute error, and *abserr*`infodict`

the dictionary containing additional information.

Let’s take an example by following the below steps:

Import the required library using the below Python code.

`from scipy.integrate import quad`

Create a function using the lambda function and define the interval as shown in the below code.

```
n3 = lambda n: n**3
a = 0
b = 5
```

Now calculate the integration of the function using the below code.

`quad(n3, a, b)`

The output shows the definite integral value of the function ** n^{3}** (n to the power 3) is

*156.25000*

.Read: Scipy Sparse – Helpful Tutorial

## Scipy Integrate Odeint

The Scipy submodule

contains method *scipy.integrate*

that integrate ordinary differential equations.*odeint()*

The syntax for using it in Python is given below.

`scipy.integrate.odeint(func, y0, t, args=(), Dfun=None, col_deriv=0, full_output=0, printmessg=0)`

Where parameters are:

It computes the derivative of function y at t.*func:*It is used to provide the initial condition for y.*y0(array):*It is a series of time point*t(array):*It is used to provide the extra arguments to a function y.*args:*Used for the gradient of a function.*Dfun:*For true values*col_deriv(boolean):*

define the derivate down to columns, otherwise across to rows in case of false.*Dfun*Used for printing the convergence message.*printmessg(boolean):*

The function contains many parameters but here above we have explained only common parameters.

The method

returns two values *odient()*`y`

that are array containing the value of y for each time t and the

for additional output information.*infodict*

Let’s take an example by following the below steps:

Import the required libraries.

```
from scipy.integrate import odeint
import matplotlib.pyplot as plt
import numpy as np
```

Define the equation using the below code.

```
def diff_model(y,t):
k = 0.5
dydt = -k * y
return dydt
```

Create an initial condition using the below code.

`y0 = 3`

Create a series of time points using the below code.

`t = np.linspace(0,15)`

Solve the created equation by providing the parameters using the below code.

`y = odeint(diff_model,y0,t)`

Now plot the solution using the below code.

```
plt.plot(t,y)
plt.xlabel('time')
plt.ylabel('y(t)')
plt.show()
```

This is how to integrate ordinary differential equations.

Read: Scipy Constants

## Scipy Integrate Solve_Ivp

The Scipy has a method

that integrates a system of ordinary differential equations based on the provided initial value.*solve_ivp()*

The syntax for using it in Python is given below.

`scipy.integrate.solve_ivp(fun, t_span, y0, method='BDF', t_eval=None, dense_output=False, events=None, vectorized=True, args=None)`

Where parameters are:

It is on the right-hand side of the system. The signature of the calling function is fun(x,z) where x represents scalar and z is a ndarray that represent the shape in two way.*fun(callable):*It represents the interval of integration from t0 to t1.*t_span(two tuple floats):*Used for specifying the initial state.*y0(array_data like shape(n)):*It is used to specify which integration method to use like RK45, Radau, RK23, DOP853, BDF, and LSODA.*method(string or odsolver):*It is used to specify the times at which to store the calculated solution.*t_eval(array_data):*It is used to specify whether we want to calculate the continuous solution or not.*dense_output(boolean):*It is used for tracking events.*events(callable):*It is used to specify whether we want to implement the function in a vectorized way or not.*Vectorized(boolean):*To pass extra arguments.*args(tuple):*

The function returns the bunch object containing many values but it has two important values that are y and t.

Let’s take an example by following the below steps:

Import the required libraries using the below python code.

`from scipy.integrate import solve_ivp`

Create an exponential decay function using the below code.

`def exp_decay(t, y): return -1.0 * y`

Now apply the method

on exponential decay function using the below code.*solve_ivp()*

`solution = solve_ivp(exp_decay, [5, 15], [4, 6, 10])`

Check the

value that is stored within the solution.*t*

`solution.t`

Check the

value that is stored within the solution.*y*

`solution.y`

This is how to integrate a system of ordinary differential equations based on the provided initial value.

Read: Scipy Optimize – Helpful Guide

## Scipy Integrate CumTrapz

The

the rule is an integration technique that cumulatively integrates the given function y(x) with the help of the trapezoid rule.*cumtrapez*

The syntax is given below.

`scipy.integrate.cumtrapz(y, x=None, dx=1.0, axis=- 1, intial=None)`

Where parameters are:

It represents the array that we want to integrate as input.*y(array_data):*It is used to specify the sample points that relate to y values.*x(array_data):*It is used to specify the space between sample points when the*dx(scalar):*

isn’t used.*x*It defines the on which axis we want to perform the integration.*axis(int):*It is used to provide the initial value to function.*initial(scalar):*

The method

returns the value *trapezoid()*

of type ndarray.*res*

Let’s take an example by following the below steps:

Import the required libraries using the below python code.

```
from scipy.integrate import cumtrapz
import numpy as np
```

Create variable ** sample_pts** which are sample points and

**which is for integration using the below code.**

*y*^{3}```
sample_pts = np.arange(5, 30)
y_func = np.power(sample_pts, 3)
```

Use the method

on function using the below code.*cumtrapz()*

`cumtrapz(y_func,sample_pts)`

This is how to use the method

to integrate the given function.*cumtrapz()*

Also, take a look at some more SciPy tutorials.

- Python Scipy Special
- Scipy Signal – Helpful Tutorial
- Scipy Ndimage Rotate
- Python Scipy Stats Kurtosis
- Python Scipy Chi-Square Test
- Python Scipy Stats Multivariate_Normal
- Scipy Normal Distribution

In this tutorial, we have learned about the “**Scipy Integrate**” and we have also covered the following topics.

- Scipy Integrate
- Scipy Integrate Simpson
- Scipy Integrate Trapzoid
- Scipy Integrate Quad
- Scipy Integrate Odeint
- Scipy Integrate Solve_Ivp
- Scipy Integrate CumTrapz

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