ajout des sources

.gitignore

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+.Rproj.user
+.Rhistory
+.RData
+.Ruserdata

1-Architecture.Rmd

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+---
+title: "Architecture"
+author: "Timothée Tabouy & Félix Cheysson & Mathieu Carmassi"
+date: "20 juillet 2018"
+output: 
+  ioslides_presentation:
+    css: styles.css
+    widescreen: true
+---
+
+<style>
+.forceBreak { -webkit-column-break-after: always;
+              break-after: column; }
+</style>
+
+# What are the architectural differences between R and C++?
+
+## From source code to binary
+
+- High level language : the statistician understands and writes "english".
+- Low level language: the CPU reads and runs binary (or machine) codes only.
+
+<center>![](images/compiler1.jpg)</center>
+
+## From source code to binary
+
+We need a translator (compiler or interpreter) to go from source to binary code.
+
+<center>![](images/compiler2.jpg)</center>
+
+***
+
+<center>![](images/Compilering-process-intro.png)</center>
+
+## Compiler versus interpreter
+
+---------------------------------------------------------------------------------------------------
+         The __Compiler__                             The __Interpreter__
+-------- -------------------------------------------- ---------------------------------------------
+Input    takes the __entire program__ and translates  takes __one statement at a time__.
+         it as a whole into machine code.
+
+Workload runs once and only needs to be called again  runs each time the code needs to be executed.
+         for re-translation.   
+
+Errors   generates the error message only after       continues translating the program until the 
+         scanning the whole program: debugging is     first error is met, in which case it stops: 
+         hard.                                        debugging is easy.
+
+Sharing  harder to share: binary may not be read by   easy to share: just pass the source code.
+         different OS, source code must be 
+         re-compiled.      
+---------------------------------------------------------------------------------------------------
+
+## Compiled language: memory allocation
+
+<div class="columns-2">
+  Because at "compile time", the compiler needs to know exactly what objects are, use of variables is less flexible:
+
+```{c eval=FALSE}
+int x;      // Construction: allocate 
+            // memory to the object.
+            
+x = 15;     // Initialisation of 
+            // the object.
+            
+x = x + 1;  // Do stuff.
+
+~x;         // Destruction: clear memory. 
+            // Usually implicit.
+```
+
+  <img src="images/memory.png" width=545 height=474>
+</div>
+
+
+
+
+# How Rcpp goes from C++ to R
+
+***
+
+<div align="center">
+<img src="images/rcpp1.png" width=963 height=528>
+</div>
+
+***
+
+<div align="center">
+<img src="images/rcpp2.png" width=963 height=528>
+</div>
+
+***
+
+<div align="center">
+<img src="images/rcpp3.png" width=963 height=528>
+</div>
+
+***
+
+<div align="center">
+<img src="images/rcpp4.png" width=963 height=528>
+</div>
+
+***
+
+<div align="center">
+<img src="images/rcpp5.png" width=963 height=528>
+</div>
+
+***
+
+<div align="center">
+<img src="images/rcpp6.png" width=963 height=528>
+</div>
+