1 files changed, 128 insertions, 0 deletions
diff --git a/src/flow_mpfr.c b/src/flow_mpfr.c
new file mode 100644
index 0000000..e03c130
--- /dev/null
+++ b/src/flow_mpfr.c
@@ -0,0 +1,128 @@
+/*
+Copyright 2015 Ian Jauslin
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include "flow_mpfr.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+// define MPFR_USE_VA_LIST to enable the use of mpfr_inits and mpfr_clears
+#define MPFR_USE_VA_LIST
+// define MPFR_USE_FILE to enable the use of mpfr_printf
+#define MPFR_USE_FILE
+#include <mpfr.h>
+#include "tools.h"
+#include "math.h"
+#include "definitions.cpp"
+#include "number.h"
+#include "array.h"
+#include "coefficient.h"
+#include "flow.h"
+#include "rcc_mpfr.h"
+
+
+
+// compute flow numerically
+int numerical_flow_mpfr(Grouped_Polynomial flow_equation, RCC_mpfr init, Labels labels, int niter, int display_mode){
+  // running coupling contants
+  RCC_mpfr rccs=init;
+  int i,j;
+
+  if(display_mode==DISPLAY_NUMERICAL){
+    // print labels
+    printf("%5s  ","n");
+    for(j=0;j<rccs.length;j++){
+      print_label(rccs.indices[j], labels);
+    }
+    printf("\n\n");
+
+    // print initial values
+    printf("%5d  ",0);
+    for(j=0;j<rccs.length;j++){
+      mpfr_printf("% 14.7Re  ",rccs.values[j]);
+    }
+    printf("\n");
+  }
+
+  for(i=0;i<niter;i++){
+    // compute a single step
+    step_flow_mpfr(&rccs, flow_equation);
+    // convert ls to alphas
+    if(display_mode==DISPLAY_NUMERICAL){
+      // print the result
+      printf("%5d  ",i+1);
+      for(j=0;j<rccs.length;j++){
+	mpfr_printf("% 14.7Re  ",rccs.values[j]);
+      }
+      printf("\n");
+    }
+  }
+
+  if(display_mode==DISPLAY_NUMERICAL){
+    // print labels
+    printf("\n");
+    printf("%5s  ","n");
+    for(j=0;j<rccs.length;j++){
+      print_label(rccs.indices[j], labels);
+    }
+    printf("\n\n");
+  }
+
+  if(display_mode==DISPLAY_FINAL){
+    RCC_mpfr_print(rccs);
+  }
+
+  return(0);
+}
+
+// single step in the flow
+int step_flow_mpfr(RCC_mpfr* rccs, Grouped_Polynomial flow_equation){
+  int i;
+  mpfr_t* res;
+
+  // security: this function assumes that the length of the rcc and the flow_equation are the same
+  if((*rccs).length!=flow_equation.length){
+    fprintf(stderr,"error: mismatch in the size of the flow equation and the rccs");
+    exit(-1);
+  }
+  
+  res=calloc((*rccs).length,sizeof(mpfr_t));
+
+  // compute the constants first
+  for(i=0;i<flow_equation.length;i++){
+    if(flow_equation.indices[i]<0){
+      evalcoef_mpfr(*rccs, flow_equation.coefs[i], res[i]);
+      mpfr_set((*rccs).values[i], res[i], MPFR_RNDN);
+    }
+  }
+
+  // for each equation
+  for(i=0;i<flow_equation.length;i++){
+    if(flow_equation.indices[i]>=0){
+      evalcoef_mpfr(*rccs, flow_equation.coefs[i], res[i]);
+    }
+  }
+
+  // set new rccs
+  for(i=0;i<flow_equation.length;i++){
+    mpfr_set((*rccs).values[i], res[i], MPFR_RNDN);
+    mpfr_clear(res[i]);
+  }
+
+  // free memory
+  free(res);
+  return(0);
+}