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Reference.org
Numerical differentiation
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<p>In <a href="/facts/Numerical_analysis/QT9cYa9z">numerical analysis</a>, numerical differentiation <a href="/facts/Algorithm/fnl5NmRt">algorithms</a> estimate the <a href="/facts/Derivative/7Ito70Dh">derivative</a> of a <a href="/facts/Function_(mathematics)/CdReEKCh">mathematical function</a> or <a href="/facts/Function_(computer_programming)/9vFJrg0A">subroutine</a> using values of the function and perhaps other knowledge about the function. </p>