35 |
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* |
36 |
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* [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005). |
37 |
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* [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006). |
38 |
< |
* [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008). |
38 |
> |
* [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008). |
39 |
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* [4] Kuang & Gezelter, J. Chem. Phys. 133, 164101 (2010). |
40 |
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* [5] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011). |
41 |
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*/ |
108 |
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RotMat3x3d rot = RotMat3x3d::identity(); // initalize rot as a unit matrix |
109 |
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|
110 |
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// use a small angle aproximation for sin and cosine |
111 |
< |
|
111 |
> |
|
112 |
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angleSqr = angle * angle; |
113 |
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angleSqrOver4 = angleSqr / 4.0; |
114 |
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top = 1.0 - angleSqrOver4; |
116 |
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|
117 |
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cosAngle = top / bottom; |
118 |
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sinAngle = angle / bottom; |
119 |
< |
|
119 |
> |
|
120 |
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// or don't use the small angle approximation: |
121 |
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//cosAngle = cos(angle); |
122 |
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//sinAngle = sin(angle); |
123 |
– |
|
123 |
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rot(axes1, axes1) = cosAngle; |
124 |
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rot(axes2, axes2) = cosAngle; |
125 |
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