core_shell_microgelscostrafo411magnetic_modelticket-1257-vesicle-productticket_1156ticket_1265_superballticket_822_more_unit_tests
Last change
on this file since 4f79d94 was
3a48772,
checked in by Paul Kienzle <pkienzle@…>, 8 years ago
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use predefined constants for fractions of pi
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-
Property mode set to
100644
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File size:
1.1 KB
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Line | |
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1 | double form_volume(double radius); |
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2 | |
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3 | double Iq(double q, |
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4 | double radius, |
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5 | double fractal_dim_mass, |
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6 | double cutoff_length); |
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7 | |
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8 | static double _mass_fractal_kernel(double q, |
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9 | double radius, |
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10 | double fractal_dim_mass, |
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11 | double cutoff_length) |
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12 | { |
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13 | // Actively check the argument. |
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14 | if (fractal_dim_mass <= 1.0){ |
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15 | return 0.0; |
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16 | } |
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17 | |
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18 | //calculate P(q) |
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19 | double pq = sph_j1c(q*radius); |
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20 | pq = pq*pq; |
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21 | |
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22 | //calculate S(q) |
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23 | double mmo = fractal_dim_mass-1.0; |
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24 | double sq = sas_gamma(mmo)*sin((mmo)*atan(q*cutoff_length)); |
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25 | sq *= pow(cutoff_length, mmo); |
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26 | sq /= pow((1.0 + (q*cutoff_length)*(q*cutoff_length)),(mmo/2.0)); |
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27 | sq /= q; |
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28 | |
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29 | //combine and return |
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30 | double result = pq * sq; |
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31 | |
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32 | return result; |
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33 | } |
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34 | double form_volume(double radius){ |
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35 | |
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36 | return M_4PI_3*radius*radius*radius; |
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37 | } |
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38 | |
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39 | double Iq(double q, |
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40 | double radius, |
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41 | double fractal_dim_mass, |
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42 | double cutoff_length) |
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43 | { |
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44 | return _mass_fractal_kernel(q, |
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45 | radius, |
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46 | fractal_dim_mass, |
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47 | cutoff_length); |
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48 | } |
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