- #1

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What can be said about how well the derivative, f'(x), is approximated by the derivative of the approximation?

Thank you.

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- Thread starter ekkilop
- Start date

- #1

- 29

- 0

What can be said about how well the derivative, f'(x), is approximated by the derivative of the approximation?

Thank you.

- #2

Svein

Science Advisor

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Not very much. Take g(x)=f(x)+sin(1000000x)/1000 as an approximation to f(x). Then g'(x) = f'(x)+1000*cos(x).What can be said about how well the derivative, f'(x), is approximated by the derivative of the approximation?

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