core_shell_microgelscostrafo411magnetic_modelrelease_v0.94release_v0.95ticket-1257-vesicle-productticket_1156ticket_1265_superballticket_822_more_unit_tests
Last change
on this file since 7d256c8 was
7d256c8,
checked in by krzywon, 8 years ago
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Removing unused variables from Si(x) function.
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-
Property mode set to
100644
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File size:
746 bytes
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1 | double Si(double x); |
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2 | |
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3 | // integral of sin(x)/x Taylor series approximated to w/i 0.1% |
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4 | double Si(double x) |
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5 | { |
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6 | double out; |
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7 | double pi = 4.0*atan(1.0); |
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8 | |
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9 | if (x >= pi*6.2/4.0){ |
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10 | double out_sin = 0.0; |
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11 | double out_cos = 0.0; |
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12 | out = pi/2.0; |
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13 | |
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14 | // Explicitly writing factorial values triples the speed of the calculation |
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15 | out_cos = 1/x - 2/pow(x,3) + 24/pow(x,5) - 720/pow(x,7) + 40320/pow(x,9); |
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16 | out_sin = 1/x - 6/pow(x,4) + 120/pow(x,6) - 5040/pow(x,8) + 362880/pow(x,10); |
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17 | |
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18 | out -= cos(x) * out_cos; |
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19 | out -= sin(x) * out_sin; |
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20 | return out; |
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21 | } |
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22 | |
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23 | // Explicitly writing factorial values triples the speed of the calculation |
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24 | out = x - pow(x, 3)/18 + pow(x,5)/600 - pow(x,7)/35280 + pow(x,9)/3265920; |
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25 | |
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26 | //printf ("Si=%g %g\n", x, out); |
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27 | return out; |
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28 | } |
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