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<h3 class="section">28.1 Definitions</h3>
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<p>A Chebyshev series is stored using the following structure,
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<pre class="example"> typedef struct
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double * c; /* coefficients c[0] .. c[order] */
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int order; /* order of expansion */
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double a; /* lower interval point */
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double b; /* upper interval point */
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<p class="noindent">The approximation is made over the range [a,b] using
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<var>order</var>+1 terms, including the coefficient c[0]. The series
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is computed using the following convention,
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which is needed when accessing the coefficients directly.