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  29. Next:&nbsp;<a rel="next" accesskey="n" href="gsldif-exceptions.html#gsldif-exceptions">gsldif exceptions</a>,
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  30. Previous:&nbsp;<a rel="previous" accesskey="p" href="gsldif-input-parameters.html#gsldif-input-parameters">gsldif input parameters</a>,
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  35. <h4 class="subsection">D.5.2 <code>gsldif</code> output</h4>
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  37. <p>The result returned by <code>library('gsldif',method) (f,x)</code> or
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  38. <code>library('gsldif',method) ((f,t),x)</code>
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  39. is an approximation of the first derivative of <var>f</var> evaluated at
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  40. <var>x</var>.
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  42.    <p>The result is obtained by the one of the GNU Scientific Library (GSL)
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  43. <a name="index-GNU-Scientific-Library-719"></a>functions for numerical differentiation that matches the virtual code
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  44. function name. These functions are documented in the GSL reference
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  45. manual. The three methods should have approximately the same results
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  46. but may differ in numerical properties.
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