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<div style="word-wrap:break-word">Here is an example using the vonb model.
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<div>You should just be able to compile the tpl file and be sure the hpp file is saved in the same directory. Note that I've commented out the standard template and the implemented two traits where if the user passes doubles for the growth parameters, the
function returns a dvector, and if the user passes dvariables, then the function returns a dvar_vector.</div>
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<div>Steve<br>
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<div>On Jun 27, 2014, at 2:19 PM, Steve Martell <<a href="mailto:SteveM@iphc.int">SteveM@iphc.int</a>> wrote:</div>
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<div>The Soln Dave points to is the most robust. You would have to overload the template function to accommodate all of the possible combinations otherwise. I have an example of traits I can send you when I get back to my mac. <br>
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Sent from my iPad</div>
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On Jun 27, 2014, at 1:43 PM, "dave fournier" <<a href="mailto:davef@otter-rsch.com" style="color:purple; text-decoration:underline">davef@otter-rsch.com</a>> wrote:<br>
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<div class="x_moz-cite-prefix">On 06/27/2014 01:38 PM, Mark Maunder wrote:<br>
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see the concept traits in the template book. It is the way to deal with this.<br>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">But that would mean the user has to know how to call the function in this special way, which is probably asking too much.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(31,73,125)">Wouldn’t simply specifying the return type as being different from the argument work? And the compiler would work out t1 from the definition of len?</span></div>
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len = vonB(age,linf,k,ro);</div>
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<b><span style="font-size:10pt; font-family:Tahoma,sans-serif">From:</span></b><span style="font-size:10pt; font-family:Tahoma,sans-serif"><span class="x_Apple-converted-space"> </span>Steve Martell [<a class="x_moz-txt-link-freetext" href="mailto:SteveM@iphc.int" style="color:purple; text-decoration:underline">mailto:SteveM@iphc.int</a>]<span class="x_Apple-converted-space"> </span><br>
<b>Sent:</b><span class="x_Apple-converted-space"> </span>Friday, June 27, 2014 1:31 PM<br>
<b>To:</b><span class="x_Apple-converted-space"> </span>Mark Maunder<br>
<b>Cc:</b><span class="x_Apple-converted-space"> </span><a class="x_moz-txt-link-abbreviated" href="mailto:developers@admb-project.org" style="color:purple; text-decoration:underline">developers@admb-project.org</a>; Alexandre Aires-Da-Silva; Carolina Minte-Vera;
Sean Patrick Cox<br>
<b>Subject:</b><span class="x_Apple-converted-space"> </span>Re: [Developers] Template functions and documentation</span></div>
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Sorry I pulled the send trigger to quickly, the baby woke up!</div>
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What I was getting at is when you have function that returns a type that is not passed as one of the arguments. You can still use a template function but when you call it, you have to specify what the return type is. eg</div>
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len = vonB<dvar_vector>(age,linf,k,ro);</div>
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In this case you would write the template as:</div>
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template<typename t1, typename t2, typename t3></div>
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t1 vonB(const t2 age, const t3 linf, const t3 k,const t3 to)</div>
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Steve</div>
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On Jun 27, 2014, at 12:19 PM, Mark Maunder <<a href="mailto:mmaunder@iattc.org" style="color:purple; text-decoration:underline">mmaunder@iattc.org</a>> wrote:</div>
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Re: In this case, the function returns a dvector, but assigns it to a dvar_vector. </div>
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Yes, I recognize this. I think this can be solved by overloading the template with an explicit type for the return variable or making the return variable a third type.</div>
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Mark</div>
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<b><span style="font-size:10pt; font-family:Tahoma,sans-serif">From:</span></b><span class="x_apple-converted-space"><span style="font-size:10pt; font-family:Tahoma,sans-serif"> </span></span><span style="font-size:10pt; font-family:Tahoma,sans-serif">Steve
Martell [<a href="mailto:SteveM@iphc.int" style="color:purple; text-decoration:underline"><span style="color:purple">mailto:SteveM@iphc.int</span></a>]<span class="x_apple-converted-space"> </span><br>
<b>Sent:</b><span class="x_apple-converted-space"> </span>Friday, June 27, 2014 11:31 AM<br>
<b>To:</b><span class="x_apple-converted-space"> </span>Mark Maunder<br>
<b>Cc:</b><span class="x_apple-converted-space"> </span><a href="mailto:developers@admb-project.org" style="color:purple; text-decoration:underline"><span style="color:purple">developers@admb-project.org</span></a>; Alexandre Aires-Da-Silva; Carolina Minte-Vera;
Sean Patrick Cox<br>
<b>Subject:</b><span class="x_apple-converted-space"> </span>Re: [Developers] Template functions and documentation</span></div>
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Hi Mark, Alex, Carolina</div>
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Attached is a pretty comprehensive book on using template classes and template functions in C++. Its a great way to fall asleep at night.</div>
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There is a lot of things you can do with templates, but from my naive perspective its a great way to reduce the need for function overloading and only have a single copy of the function to maintain. The primary thing to remember is that the compiler will write
the actual code that gets implemented; therefore, the function templates are usually found in the header file (.h or .htp, or .hpp).</div>
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One thing to be aware of is return types that differ from the types passed to the function arguments. For example:</div>
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in the vonb.hpp file:</div>
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template<typename t1, typename t2></div>
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return(linf*(1.-exp(-vonbk*age)));</div>
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in your tpl file:</div>
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age.fill_seqadd(1,1);</div>
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len = vonB(age,linf,vbk);</div>
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In this case, the function returns a dvector, but assigns it to a dvar_vector. And this will be problematic.</div>
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On Jun 27, 2014, at 11:05 A</div>
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M, Mark Maunder <<a href="mailto:mmaunder@iattc.org" style="color:purple; text-decoration:underline"><span style="color:purple">mmaunder@iattc.org</span></a>> wrote:</div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">Hi developers,</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">I am in the process or putting together a model that will be used to evaluate several growth equations so I thought I better try to use the ADMB project “approved” approach for writing the functions.
Below is a template function and documentation for the von Bertalanffy growth equation. I would appreciate any advice on doing this “correctly”.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">Thanks,</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">\defgroup CONTRIB Contributed libraries</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">#include <admodel.h></span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">/** von Bertalanffy growth equation; constant objects.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> \ingroup CAPAM</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> \brief Calculate the length from a given age based on the von Bertalanffy equation. Written by Mark Maunder.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> \param age age of individual, \f$a\f$.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> \param Linf asymptotic length, \f$L_inf\f$.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> \param K growth rate, \f$K\f$.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> \param t0 age at zero length, \f$t_0\f$.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> \return length predicted length of individual. \f$L_inf*(1-exp(-K*(a-t0)))\f$.</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> */</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> </span></p>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">template <typename type1, typename type1></span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">//can have multiple types so that they are used below in variable definitions, they can differ between function calls, but remain the same within a function call</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">//type1 is probably a long</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">//type2 is probably a dvariable (either a model parameter (Linf K t0) or a derived variable (length))</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">//may need a type3, which is a dvar_vector if age and length are vectors, where type 1 will be a vector</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">type1 vonB(const type1 &age, const type2 &Linf, const type2 &K, const type2 &t0)</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">{</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> type2 length = Linf*(1.-mfexp(-K*(age-t0)));</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> return (length);</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">} </span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> </span></p>
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<span style="font-size:11pt; font-family:Calibri,sans-serif"> </span></p>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">//is length a bad word to use</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">//do we use ingroup for both groups and subgroups in doxygen documentation</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">//should we use mfexp?</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">//what if age and length are vectors, but age is a vector and length is a dvar_vector, do we need to overload the type with one with three variable types</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">//I couldn't work out how to put in the detailed description</span></div>
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<span style="font-size:11pt; font-family:Calibri,sans-serif">//The equations did not work on my computer</span></div>
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<pre>_______________________________________________
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