Find the solution of the following equation using the bisection method:
Write a Python 3 code for this method.
Let’s choose the initial values of x so that
have different signs:
Plugging the above values into the equation, we get:
The next value of x is:
value into the equation:
As the signs of
are the same, we will replace the x0 value with x2 and repeat the above steps:
Now, we will replace the x1 value with x2, as the signs of
are the same:
the root of the equation is approximately equal to 1.89282.
Python 3 Code
Let’s define a function for our equation first:
Now, we will write a function for defining the sign:
This is our main function for finding the root of the equation. As we must choose two initial values for x, our function should accept two initial parameters:
And let’s repeat the above steps in a while loop. In order to prevent infinite loop, it’s important to add an exit condition. In our case we will check if the absolute value of y is larger than the 0.001 threshold. To decide what x value should be replaced, the sign check statement will be written as follows:
The entire code:
The bisection method is one of the root-finding methods for continuous functions. If you want to become an expert at mathematics, you should carefully check our bisection method example and learn more about it.
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