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Fix lookup table index #14

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Fix lookup table index #14

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10 changes: 5 additions & 5 deletions src/ffts_trig.c
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Expand Up @@ -37,11 +37,11 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* For more information on algorithms:
*
* D. Potts, G. Steidl, M. Tasche, Numerical stability of fast
* trigonometric transforms � a worst case study,
* J. Concrete Appl. Math. 1 (2003) 1�36
* trigonometric transforms — a worst case study,
* J. Concrete Appl. Math. 1 (2003) 1–36
*
* O. Buneman, Stable on�line creation of sines and cosines of
* successive angles, Proc. IEEE 75, 1434 � 1435 (1987).
* O. Buneman, Stable on–line creation of sines and cosines of
* successive angles, Proc. IEEE 75, 1434 – 1435 (1987).
*/

/* An union to initialize doubles using byte presentation,
Expand Down Expand Up @@ -406,7 +406,7 @@ ffts_cexp_32f64f(size_t n, size_t d, double *output)

/* table lookup */
cos_a = ct[4 * i + 0].d;
sin_a = ct[4 * i + 2].d;
sin_a = ct[4 * i + 1].d;

/* evaluate polynomials */
cos_b = 1.0 + z * (cc[0].d + z * (cc[1].d + z * cc[2].d));
Expand Down