From 5a986f2064cf0b2fbd94e636cc4fa56d9939ca42 Mon Sep 17 00:00:00 2001
From: Johannes Ranke <jranke@uni-bremen.de>
Date: Tue, 3 Nov 2020 05:08:25 +0100
Subject: C implementation of the SFO function

Only pays off for large time series with length >> 100
---
 NAMESPACE              |   1 +
 R/parent_solutions.R   |   6 ++----
 build.log              |  25 +++++++++++++++++++++----
 src/mkin.so            | Bin 0 -> 20920 bytes
 src/parent_solutions.c |  25 +++++++++++++++++++++++++
 src/parent_solutions.o | Bin 0 -> 10176 bytes
 6 files changed, 49 insertions(+), 8 deletions(-)
 create mode 100755 src/mkin.so
 create mode 100644 src/parent_solutions.c
 create mode 100644 src/parent_solutions.o

diff --git a/NAMESPACE b/NAMESPACE
index 9554a0d6..ca5fa4b1 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -123,3 +123,4 @@ importFrom(stats,update)
 importFrom(stats,var)
 importFrom(utils,getFromNamespace)
 importFrom(utils,write.table)
+useDynLib(mkin,SFO_solution)
diff --git a/R/parent_solutions.R b/R/parent_solutions.R
index 04226b73..bbdffc21 100644
--- a/R/parent_solutions.R
+++ b/R/parent_solutions.R
@@ -22,11 +22,9 @@
 #'
 #'   \dontrun{plot(function(x) SFO.solution(x, 100, 3), 0, 2)}
 #'
+#' @useDynLib mkin SFO_solution
 #' @export
-SFO.solution <- function(t, parent_0, k)
-{
-	parent = parent_0 * exp(-k * t)
-}
+SFO.solution <- function(t, parent_0, k) .Call(SFO_solution, as.double(t), as.double(parent_0), as.double(k))
 
 #' First-Order Multi-Compartment kinetics
 #' 
diff --git a/build.log b/build.log
index d101d06b..f82ccec6 100644
--- a/build.log
+++ b/build.log
@@ -1,9 +1,26 @@
 * checking for file ‘./DESCRIPTION’ ... OK
 * preparing ‘mkin’:
 * checking DESCRIPTION meta-information ... OK
+* cleaning src
 * installing the package to build vignettes
-* creating vignettes ... OK
-* checking for LF line-endings in source and make files and shell scripts
-* checking for empty or unneeded directories
-* building ‘mkin_0.9.50.4.tar.gz’
+* creating vignettes ... ERROR
+--- re-building ‘FOCUS_D.rmd’ using rmarkdown
+Quitting from lines 49-50 (FOCUS_D.rmd) 
+Error: processing vignette 'FOCUS_D.rmd' failed with diagnostics:
+replacement has 21 rows, data has 38
+--- failed re-building ‘FOCUS_D.rmd’
 
+--- re-building ‘FOCUS_L.rmd’ using rmarkdown
+--- finished re-building ‘FOCUS_L.rmd’
+
+--- re-building ‘mkin.rmd’ using rmarkdown
+--- finished re-building ‘mkin.rmd’
+
+--- re-building ‘twa.rmd’ using rmarkdown
+--- finished re-building ‘twa.rmd’
+
+SUMMARY: processing the following file failed:
+  ‘FOCUS_D.rmd’
+
+Error: Vignette re-building failed.
+Execution halted
diff --git a/src/mkin.so b/src/mkin.so
new file mode 100755
index 00000000..3d515096
Binary files /dev/null and b/src/mkin.so differ
diff --git a/src/parent_solutions.c b/src/parent_solutions.c
new file mode 100644
index 00000000..4881d708
--- /dev/null
+++ b/src/parent_solutions.c
@@ -0,0 +1,25 @@
+#include <R.h>
+#include <Rinternals.h>
+
+SEXP SFO_solution(SEXP t, SEXP parent_0_, SEXP k_) {
+
+  int n = length(t);
+
+  double parent_0 = asReal(parent_0_);
+  double k = asReal(k_);
+
+  double *pt, *pout;
+
+  SEXP out = PROTECT(allocVector(REALSXP, n));
+
+  pt = REAL(t);
+  pout = REAL(out);
+
+  for (int i = 0; i < n; i++) {
+    pout[i] = parent_0 * exp(- k * pt[i]);
+  }
+
+  UNPROTECT(1);
+
+  return out;
+}
diff --git a/src/parent_solutions.o b/src/parent_solutions.o
new file mode 100644
index 00000000..9ca88e7d
Binary files /dev/null and b/src/parent_solutions.o differ
-- 
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