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/*
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 "meantools_deriv.h"
#include <stdio.h>
#include <stdlib.h>
#include "parse_file.h"
#include "cli_parser.h"
#include "istring.h"
#include "definitions.cpp"
#include "array.h"
#include "grouped_polynomial.h"
#define CP_FLAG_DERIVS 1
#define CP_FLAG_VARS 2
// read command line arguments
int tool_deriv_read_args(int argc, const char* argv[], Str_Array* str_args, Meantools_Options* opts){
// file to read the polynomial from in flow mode
const char* file="";
// whether a file was specified on the command-line
int exists_file=0;
// flag
int flag=0;
// buffer in which to read the variables
Char_Array buffer;
int i;
char* ptr;
// defaults
// derive once
(*opts).deriv_derivs=1;
// derive with respect to all variables
(*opts).deriv_vars.length=-1;
// loop over arguments
for(i=2;i<argc;i++){
// flag
if(argv[i][0]=='-'){
for(ptr=((char*)argv[i])+1;*ptr!='\0';ptr++){
switch(*ptr){
// number of derivatives
case 'd':
flag=CP_FLAG_DERIVS;
break;
case 'V':
flag=CP_FLAG_VARS;
break;
}
}
}
// number of derivatives
else if(flag==CP_FLAG_DERIVS){
sscanf(argv[i],"%d",&((*opts).deriv_derivs));
flag=0;
}
// variables
else if(flag==CP_FLAG_VARS){
// if the argument is "all" then derive wrt all variables
if(str_cmp((char*)argv[i],"all")){
(*opts).deriv_vars.length=-2;
}
else{
str_to_char_array((char*)argv[i], &buffer);
int_array_read(buffer,&((*opts).deriv_vars));
free_Char_Array(buffer);
}
flag=0;
}
// read file name from command-line
else{
file=argv[i];
exists_file=1;
}
}
read_config_file(str_args, file, 1-exists_file);
return(0);
}
// derive a flow equation
int tool_deriv(Str_Array str_args, Meantools_Options opts){
// index of the entry in the input file
int arg_index;
// flow equation
Grouped_Polynomial flow_equation;
// flow equation for the derivatives
Grouped_Polynomial flow_equation_deriv;
int i;
// parse flow equation
// if there is a unique argument, assume it is the flow equation
if(str_args.length==1){
char_array_to_Grouped_Polynomial(str_args.strs[0], &flow_equation);
}
else{
arg_index=find_str_arg("flow_equation", str_args);
if(arg_index<0){
fprintf(stderr,"error: no flow equation entry in the configuration file\n");
exit(-1);
}
else{
char_array_to_Grouped_Polynomial(str_args.strs[arg_index], &flow_equation);
}
// variables
// check they were not specified on the command line
if(opts.deriv_vars.length==-1){
arg_index=find_str_arg("variables", str_args);
if(arg_index>=0){
int_array_read(str_args.strs[arg_index],&(opts.deriv_vars));
}
}
}
// if variables length is negative then set the variables to all of the available ones
if(opts.deriv_vars.length<0){
init_Int_Array(&(opts.deriv_vars), flow_equation.length);
for(i=0;i<flow_equation.length;i++){
int_array_append(flow_equation.indices[i], &(opts.deriv_vars));
}
}
// compute derivatives
flow_equation_derivative(opts.deriv_derivs, opts.deriv_vars, flow_equation, &flow_equation_deriv);
grouped_polynomial_print(flow_equation_deriv,'%','%');
// free memory
free_Grouped_Polynomial(flow_equation);
free_Grouped_Polynomial(flow_equation_deriv);
free_Int_Array(opts.deriv_vars);
return(0);
}
// n first derivatives of a flow equation wrt to variables
int flow_equation_derivative(int n, Int_Array variables, Grouped_Polynomial flow_equation, Grouped_Polynomial* flow_equation_derivs){
Grouped_Polynomial dflow;
Grouped_Polynomial tmpflow;
Int_Array indices;
int i,j;
int_array_cpy(variables, &indices);
// output polynomial
grouped_polynomial_cpy(flow_equation, flow_equation_derivs);
for(j=0,dflow=flow_equation;j<n;j++){
// tmp flow contains the result of the previous derivative
grouped_polynomial_cpy(dflow, &tmpflow);
// derive
flow_equation_derivx(tmpflow, indices, &dflow);
// free
free_Grouped_Polynomial(tmpflow);
// add the derived indices as variables for the next derivative
for(i=0;i<variables.length;i++){
if(variables.values[i]>=0){
int_array_append((j+1)*DOFFSET+variables.values[i], &indices);
}
// constants have a negative index
else{
int_array_append(-(j+1)*DOFFSET+variables.values[i], &indices);
}
}
// add to flow equation
grouped_polynomial_concat(dflow, flow_equation_derivs);
}
if(n>0){
free_Grouped_Polynomial(dflow);
}
free_Int_Array(indices);
return(0);
}
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