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91 </tr>91 </tr>
92 </table><p>As·before,·we·neglect·the·denominator,·which·has·no·effect·upon·the·maximisation·problem,·and·assume·a·uniform·prior·<img·src="images/img-1192.png"·alt="$\mathrm{P}\left(·\sigma·_\mathrm·{data}·|·\left\{··\mathbf{x}_·i·\right\}··\right)$"·style="vertical-align:-5px;·92 </table><p>As·before,·we·neglect·the·denominator,·which·has·no·effect·upon·the·maximisation·problem,·and·assume·a·uniform·prior·<img·src="images/img-1192.png"·alt="$\mathrm{P}\left(·\sigma·_\mathrm·{data}·|·\left\{··\mathbf{x}_·i·\right\}··\right)$"·style="vertical-align:-5px;·
93 ·····································width:110px;·93 ·····································width:110px;·
94 ·····································height:19px"·class="math·gen"·/>.·This·reduces·the·problem·to·the·maximisation·of·<img·src="images/img-1193.png"·alt="$\mathrm{P}\left(·\left\{··f_·i·\right\}··|·\sigma·_\mathrm·{data},·\left\{··\mathbf{x}_·i·\right\}··\right)$"·style="vertical-align:-5px;·94 ·····································height:19px"·class="math·gen"·/>.·This·reduces·the·problem·to·the·maximisation·of·<img·src="images/img-1193.png"·alt="$\mathrm{P}\left(·\left\{··f_·i·\right\}··|·\sigma·_\mathrm·{data},·\left\{··\mathbf{x}_·i·\right\}··\right)$"·style="vertical-align:-5px;·
95 ·····································width:151px;·95 ·····································width:151px;·
96 ·····································height:19px"·class="math·gen"·/>,·which·we·may·write·as·a·marginalised·probability·distribution·over·<img·src="images/img-1134.png"·alt="$\mathbf{u}$"·style="vertical-align:0px;·96 ·····································height:19px"·class="math·gen"·/>,·which·we·may·write·as·a·marginalised·probability·distribution·over·<img·src="images/img-1134.png"·alt="$\mathbf{u}$"·style="vertical-align:0px;·
97 ·····································width:12px;·97 ·····································width:12px;·
98 ·····································height:8px"·class="math·gen"·/>:·</p><table·id="&lt;plasTeX.TeXFragment·object·at·0xffff9d9a63f8&gt;"·cellpadding="7"·width="100%"·cellspacing="0"·class="eqnarray">98 ·····································height:8px"·class="math·gen"·/>:·</p><table·id="&lt;plasTeX.TeXFragment·object·at·0xffff7bc05460&gt;"·cellpadding="7"·width="100%"·cellspacing="0"·class="eqnarray">
99 <tr·id="a0000001991">99 <tr·id="a0000001991">
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104 ········<td·style="vertical-align:middle;····································text-align:right"><img·src="images/img-1194.png"·alt="$\displaystyle··\label{eqa:p_·f_·given_·sigma}·\mathrm{P}\left(·\left\{··f_·i·\right\}··|·\sigma·_\mathrm·{data},·\left\{··\mathbf{x}_·i·\right\}··\right)·=·\idotsint·_{-\infty·}^{\infty·}··$"·style="vertical-align:-16px;·width:256px;·····················height:42px"·class="math·gen"·/></td>104 ········<td·style="vertical-align:middle;····································text-align:right"><img·src="images/img-1194.png"·alt="$\displaystyle··\label{eqa:p_·f_·given_·sigma}·\mathrm{P}\left(·\left\{··f_·i·\right\}··|·\sigma·_\mathrm·{data},·\left\{··\mathbf{x}_·i·\right\}··\right)·=·\idotsint·_{-\infty·}^{\infty·}··$"·style="vertical-align:-16px;·width:256px;·····················height:42px"·class="math·gen"·/></td>
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181 ·····································height:21px"·class="math·gen"·/>.·In·the·small-angle·approximation,·such·that·<img·src="images/img-0402.png"·alt="$\sin·\theta·\approx·\theta·$"·style="vertical-align:0px;·181 ·····································height:21px"·class="math·gen"·/>.·In·the·small-angle·approximation,·such·that·<img·src="images/img-0402.png"·alt="$\sin·\theta·\approx·\theta·$"·style="vertical-align:0px;·
182 ·····································width:67px;·182 ·····································width:67px;·
183 ·····································height:13px"·class="math·gen"·/>,·it·reduces·to·the·equation·for·simple·harmonic·motion,·with·the·solution·</p></td>183 ·····································height:13px"·class="math·gen"·/>,·it·reduces·to·the·equation·for·simple·harmonic·motion,·with·the·solution·</p></td>
  
184 </tr><tr>184 </tr><tr>
  
185 ····185 ····
186 ····<td·style="text-align:left;·border-right:1px·solid·black;·border-left:1px·solid·black"><table·id="&lt;plasTeX.TeXFragment·object·at·0xffffa0a1c668&gt;"·class="equation"·width="100%"·cellspacing="0"·cellpadding="7">186 ····<td·style="text-align:left;·border-right:1px·solid·black;·border-left:1px·solid·black"><table·id="&lt;plasTeX.TeXFragment·object·at·0xffff7ec786d0&gt;"·class="equation"·width="100%"·cellspacing="0"·cellpadding="7">
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190 ····<td><img·src="images/img-0403.png"·alt="\begin{equation}··\theta·_\mathrm·{approx}=\omega·\sin·\left(\sqrt·{\frac{g}{l}}t\right).·\label{eq:pendulum_·approx}·\end{equation}"·style="width:188px;·190 ····<td><img·src="images/img-0403.png"·alt="\begin{equation}··\theta·_\mathrm·{approx}=\omega·\sin·\left(\sqrt·{\frac{g}{l}}t\right).·\label{eq:pendulum_·approx}·\end{equation}"·style="width:188px;·
191 ····························height:45px"·class="math·gen"·/></td>191 ····························height:45px"·class="math·gen"·/></td>
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203 ····<td·style="text-align:left;·border-right:1px·solid·black;·border-left:1px·solid·black"><p>A·more·exact·solution·requires·integration·of·the·second-order·differential·equation·of·motion·including·the·<img·src="images/img-0404.png"·alt="$\sin·\theta·$"·style="vertical-align:0px;·203 ····<td·style="text-align:left;·border-right:1px·solid·black;·border-left:1px·solid·black"><p>A·more·exact·solution·requires·integration·of·the·second-order·differential·equation·of·motion·including·the·<img·src="images/img-0404.png"·alt="$\sin·\theta·$"·style="vertical-align:0px;·
204 ·····································width:34px;·204 ·····································width:34px;·
205 ·····································height:13px"·class="math·gen"·/>·term.·This·integral·cannot·be·done·analytically,·but·the·solution·can·be·written·in·the·form·</p></td>205 ·····································height:13px"·class="math·gen"·/>·term.·This·integral·cannot·be·done·analytically,·but·the·solution·can·be·written·in·the·form·</p></td>
  
206 </tr><tr>206 </tr><tr>
  
207 ····207 ····
208 ····<td·style="text-align:left;·border-right:1px·solid·black;·border-left:1px·solid·black"><table·id="&lt;plasTeX.TeXFragment·object·at·0xffffa0a1cae0&gt;"·class="equation"·width="100%"·cellspacing="0"·cellpadding="7">208 ····<td·style="text-align:left;·border-right:1px·solid·black;·border-left:1px·solid·black"><table·id="&lt;plasTeX.TeXFragment·object·at·0xffff7ec78b48&gt;"·class="equation"·width="100%"·cellspacing="0"·cellpadding="7">
209 <tr>209 <tr>
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211 ····<td·style="width:40%">&nbsp;</td>211 ····<td·style="width:40%">&nbsp;</td>
212 ····<td><img·src="images/img-0405.png"·alt="\begin{equation}··\theta·_\mathrm·{exact}(t)·=·2\sin·^{-1}\left[·k\,·\mathrm{sn}\left(\sqrt·{\frac{g}{l}}t,k\right)\right].·\label{eq:pendulum_·exact}·\end{equation}"·style="width:286px;·212 ····<td><img·src="images/img-0405.png"·alt="\begin{equation}··\theta·_\mathrm·{exact}(t)·=·2\sin·^{-1}\left[·k\,·\mathrm{sn}\left(\sqrt·{\frac{g}{l}}t,k\right)\right].·\label{eq:pendulum_·exact}·\end{equation}"·style="width:286px;·
213 ····························height:45px"·class="math·gen"·/></td>213 ····························height:45px"·class="math·gen"·/></td>
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68 ·····································height:10px"·class="math·gen"·/>-dimensional·Gaussian·distribution·around·<img·src="images/img-1141.png"·alt="$\mathbf{u}^0$"·style="vertical-align:0px;·68 ·····································height:10px"·class="math·gen"·/>-dimensional·Gaussian·distribution·around·<img·src="images/img-1141.png"·alt="$\mathbf{u}^0$"·style="vertical-align:0px;·
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70 ·····································height:16px"·class="math·gen"·/>.·Taking·a·Taylor·expansion·of·<img·src="images/img-1142.png"·alt="$L(\mathbf{u})$"·style="vertical-align:-5px;·70 ·····································height:16px"·class="math·gen"·/>.·Taking·a·Taylor·expansion·of·<img·src="images/img-1142.png"·alt="$L(\mathbf{u})$"·style="vertical-align:-5px;·
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72 ·····································height:19px"·class="math·gen"·/>·about·<img·src="images/img-1141.png"·alt="$\mathbf{u}^0$"·style="vertical-align:0px;·72 ·····································height:19px"·class="math·gen"·/>·about·<img·src="images/img-1141.png"·alt="$\mathbf{u}^0$"·style="vertical-align:0px;·
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74 ·····································height:16px"·class="math·gen"·/>,·we·can·write:·</p><table·id="&lt;plasTeX.TeXFragment·object·at·0xffff9da483f8&gt;"·cellpadding="7"·width="100%"·cellspacing="0"·class="eqnarray">74 ·····································height:16px"·class="math·gen"·/>,·we·can·write:·</p><table·id="&lt;plasTeX.TeXFragment·object·at·0xffff7bca7460&gt;"·cellpadding="7"·width="100%"·cellspacing="0"·class="eqnarray">
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80 ········<td·style="vertical-align:middle;····································text-align:right"><img·src="images/img-1143.png"·alt="$\displaystyle··L(\mathbf{u})··$"·style="vertical-align:-5px;·width:37px;·····················height:19px"·class="math·gen"·/></td>80 ········<td·style="vertical-align:middle;····································text-align:right"><img·src="images/img-1143.png"·alt="$\displaystyle··L(\mathbf{u})··$"·style="vertical-align:-5px;·width:37px;·····················height:19px"·class="math·gen"·/></td>
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113 </tr>113 </tr>
114 </table><p>Since·the·logarithm·of·a·Gaussian·distribution·is·a·parabola,·the·quadratic·terms·in·the·above·expansion·encode·the·Gaussian·component·of·the·probability·distribution·<img·src="images/img-1135.png"·alt="$\mathrm{P}\left(·\mathbf{u}·|·\left\{··\mathbf{x}_·i,·f_·i,·\sigma·_·i·\right\}··\right)$"·style="vertical-align:-5px;·114 </table><p>Since·the·logarithm·of·a·Gaussian·distribution·is·a·parabola,·the·quadratic·terms·in·the·above·expansion·encode·the·Gaussian·component·of·the·probability·distribution·<img·src="images/img-1135.png"·alt="$\mathrm{P}\left(·\mathbf{u}·|·\left\{··\mathbf{x}_·i,·f_·i,·\sigma·_·i·\right\}··\right)$"·style="vertical-align:-5px;·
115 ·····································width:129px;·115 ·····································width:129px;·
116 ·····································height:19px"·class="math·gen"·/>·about·<img·src="images/img-1141.png"·alt="$\mathbf{u}^0$"·style="vertical-align:0px;·116 ·····································height:19px"·class="math·gen"·/>·about·<img·src="images/img-1141.png"·alt="$\mathbf{u}^0$"·style="vertical-align:0px;·
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118 ·····································height:16px"·class="math·gen"·/>.<a·href="#a0000001970"·class="footnote"><sup·class="footnotemark">1</sup></a>·We·may·write·the·sum·of·these·terms,·which·we·denote·<img·src="images/img-1146.png"·alt="$Q$"·style="vertical-align:-4px;·118 ·····································height:16px"·class="math·gen"·/>.<a·href="#a0000001970"·class="footnote"><sup·class="footnotemark">1</sup></a>·We·may·write·the·sum·of·these·terms,·which·we·denote·<img·src="images/img-1146.png"·alt="$Q$"·style="vertical-align:-4px;·
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120 ·····································height:17px"·class="math·gen"·/>,·in·matrix·form:·</p><table·id="&lt;plasTeX.TeXFragment·object·at·0xffff9da68050&gt;"·class="equation"·width="100%"·cellspacing="0"·cellpadding="7">120 ·····································height:17px"·class="math·gen"·/>,·in·matrix·form:·</p><table·id="&lt;plasTeX.TeXFragment·object·at·0xffff7bcc70b8&gt;"·class="equation"·width="100%"·cellspacing="0"·cellpadding="7">
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124 ····<td><img·src="images/img-1147.png"·alt="\begin{equation}··Q·=·\frac{1}{2}·\left(\mathbf{u}·-·\mathbf{u}^0\right)^\mathbf·{T}·\mathbf{A}·\left(\mathbf{u}·-·\mathbf{u}^0\right)·\label{eqn:Q_·vector}·\end{equation}"·style="width:226px;·124 ····<td><img·src="images/img-1147.png"·alt="\begin{equation}··Q·=·\frac{1}{2}·\left(\mathbf{u}·-·\mathbf{u}^0\right)^\mathbf·{T}·\mathbf{A}·\left(\mathbf{u}·-·\mathbf{u}^0\right)·\label{eqn:Q_·vector}·\end{equation}"·style="width:226px;·
125 ····························height:37px"·class="math·gen"·/></td>125 ····························height:37px"·class="math·gen"·/></td>
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55 </span>55 </span>
56 <hr·/>56 <hr·/>
57 </div>57 </div>
  
58 <div><h1·id="a0000000300">C.4·The·covariance·matrix</h1>58 <div><h1·id="a0000000300">C.4·The·covariance·matrix</h1>
59 <p>·<a·name="a0000001974"·id="a0000001974"></a>·</p><p>The·terms·of·the·covariance·matrix·<img·src="images/img-1159.png"·alt="$V_{ij}$"·style="vertical-align:-5px;·59 <p>·<a·name="a0000001974"·id="a0000001974"></a>·</p><p>The·terms·of·the·covariance·matrix·<img·src="images/img-1159.png"·alt="$V_{ij}$"·style="vertical-align:-5px;·
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61 ·····································height:18px"·class="math·gen"·/>·are·defined·by:·</p><table·id="&lt;plasTeX.TeXFragment·object·at·0xffff9d9fad50&gt;"·class="equation"·width="100%"·cellspacing="0"·cellpadding="7">61 ·····································height:18px"·class="math·gen"·/>·are·defined·by:·</p><table·id="&lt;plasTeX.TeXFragment·object·at·0xffff7bc58db8&gt;"·class="equation"·width="100%"·cellspacing="0"·cellpadding="7">
62 <tr>62 <tr>
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65 ····<td><img·src="images/img-1160.png"·alt="\begin{equation}··V_{ij}·=·\left&lt;·\left(u_·i·-·u^0_·i\right)·\left(u_·j·-·u^0_·j\right)·\right&gt;·\label{eqn:def_·covar}·\end{equation}"·style="width:213px;·65 ····<td><img·src="images/img-1160.png"·alt="\begin{equation}··V_{ij}·=·\left&lt;·\left(u_·i·-·u^0_·i\right)·\left(u_·j·-·u^0_·j\right)·\right&gt;·\label{eqn:def_·covar}·\end{equation}"·style="width:213px;·
66 ····························height:24px"·class="math·gen"·/></td>66 ····························height:24px"·class="math·gen"·/></td>
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184 ····<td·class="eqnnum"·style="width:20%"><span>(<span>C.11</span>)</span></td>184 ····<td·class="eqnnum"·style="width:20%"><span>(<span>C.11</span>)</span></td>
185 </tr>185 </tr>
186 </table><p>which·we·may·identify·as·equalling·<img·src="images/img-1159.png"·alt="$V_{ij}$"·style="vertical-align:-5px;·186 </table><p>which·we·may·identify·as·equalling·<img·src="images/img-1159.png"·alt="$V_{ij}$"·style="vertical-align:-5px;·
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189 <tr·id="a0000001982">189 <tr·id="a0000001982">
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194 ········<td·style="vertical-align:middle;····································text-align:right"><img·src="images/img-1177.png"·alt="$\displaystyle··\label{eqa:v_·zrelate}·V_{ij}··$"·style="vertical-align:-5px;·width:21px;·····················height:18px"·class="math·gen"·/></td>194 ········<td·style="vertical-align:middle;····································text-align:right"><img·src="images/img-1177.png"·alt="$\displaystyle··\label{eqa:v_·zrelate}·V_{ij}··$"·style="vertical-align:-5px;·width:21px;·····················height:18px"·class="math·gen"·/></td>
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