How to calculate the error between the two signs

Hello :

I have two signals the first reference and the second approximate (as shown in the picture)

How do I calculate the error between them .

thanks .

[Ajay Kumar]

By error, you mean the difference between them?

[Ezziane Hassan]

Between two signs (sain and fault )

[Ezziane Hassan]

i think error quadratic it's good here ?

Answer 1

[Jesús Zambrano]

Could you narrow your question a bit more? What kind of error do you want to calculate?

For example: percentage error?, mean squared error?, mean absolute percentage error?, minimum mean-squared error?

[Ezziane Hassan]

Thanks for your answer I want the square error and the percentage error.