# Backward Finite-Div​ided-Diffe​rence Coding

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Adrian el 12 de Jun. de 2023
Respondida: Nivedita el 7 de Nov. de 2023
g = input('Enter the function: e.g @(x) sin(x): ','s');
f = str2func(g);
h = input('Enter step size, H: ');
x = input('At which point you want to approximate the derivative: ');
Bd2 = (f(x)-f(x-h))/h;
fprintf('Backward FDD: %.4f',Bd2)
How do I make my coding to compute this function @(x) -0.3757*x+5
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Ashutosh el 14 de Jun. de 2023
It works as expected for me, what is the error message you are getting?
Kim el 28 de Oct. de 2023
Error using str2func Argument must be a text scalar. Error in BDD (line 9) f = str2func(g);

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### Respuestas (1)

Nivedita el 7 de Nov. de 2023
I understand that you want to compute the function @(x) -0.3757*x+5 with the provided code.
I executed the provided code and it worked as expected from the definition of the "Bd2" variable providing a result of 0.3757.
If you are facing any difficulty with the "str2func" function and obtaining the same error as mentioned by Kim, you can take care of the following pointers:
1. Ensure that there are no extra characters or spaces in the function expression stored in "g".
2. Verify that the function expression in "g" follows the correct syntax as you have mentioned in your question.
I hope it helped!
Regards,
Nivedita.
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