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C++ Mathematical Expression Library (ExprTk) http://www.partow.net/programming/exprtk/index.html

This commit is contained in:
Arash Partow 2014-05-31 07:38:57 +10:00
parent 6b86ec0deb
commit 1bf1073cd8
8 changed files with 145 additions and 38 deletions
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6
Makefile
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@ -36,6 +36,7 @@ BUILD_LIST+=exprtk_simple_example_09
BUILD_LIST+=exprtk_simple_example_10 BUILD_LIST+=exprtk_simple_example_10
BUILD_LIST+=exprtk_simple_example_11 BUILD_LIST+=exprtk_simple_example_11
BUILD_LIST+=exprtk_simple_example_12 BUILD_LIST+=exprtk_simple_example_12
BUILD_LIST+=exprtk_simple_example_13
all: $(BUILD_LIST) all: $(BUILD_LIST)
@ -81,6 +82,9 @@ exprtk_simple_example_11: exprtk_simple_example_11.cpp exprtk.hpp
exprtk_simple_example_12: exprtk_simple_example_12.cpp exprtk.hpp exprtk_simple_example_12: exprtk_simple_example_12.cpp exprtk.hpp
$(COMPILER) $(OPTIONS) exprtk_simple_example_12 exprtk_simple_example_12.cpp $(LINKER_OPT) $(COMPILER) $(OPTIONS) exprtk_simple_example_12 exprtk_simple_example_12.cpp $(LINKER_OPT)
exprtk_simple_example_13: exprtk_simple_example_13.cpp exprtk.hpp
$(COMPILER) $(OPTIONS) exprtk_simple_example_13 exprtk_simple_example_13.cpp $(LINKER_OPT)
pgo: exprtk_test.cpp exprtk_benchmark.cpp exprtk.hpp pgo: exprtk_test.cpp exprtk_benchmark.cpp exprtk.hpp
$(COMPILER) $(BASE_OPTIONS) -O3 -march=native -fprofile-generate -o exprtk_benchmark exprtk_benchmark.cpp $(LINKER_OPT) $(COMPILER) $(BASE_OPTIONS) -O3 -march=native -fprofile-generate -o exprtk_benchmark exprtk_benchmark.cpp $(LINKER_OPT)
./exprtk_benchmark ./exprtk_benchmark
@ -101,6 +105,7 @@ strip_bin:
strip -s exprtk_simple_example_10 strip -s exprtk_simple_example_10
strip -s exprtk_simple_example_11 strip -s exprtk_simple_example_11
strip -s exprtk_simple_example_12 strip -s exprtk_simple_example_12
strip -s exprtk_simple_example_13
valgrind_check: valgrind_check:
valgrind --leak-check=full --show-reachable=yes --track-origins=yes --log-file=exprtk_test_valgrind.log -v ./exprtk_test valgrind --leak-check=full --show-reachable=yes --track-origins=yes --log-file=exprtk_test_valgrind.log -v ./exprtk_test
@ -117,6 +122,7 @@ valgrind_check:
valgrind --leak-check=full --show-reachable=yes --track-origins=yes --log-file=exprtk_simple_example_10_valgrind.log -v ./exprtk_simple_example_10 valgrind --leak-check=full --show-reachable=yes --track-origins=yes --log-file=exprtk_simple_example_10_valgrind.log -v ./exprtk_simple_example_10
valgrind --leak-check=full --show-reachable=yes --track-origins=yes --log-file=exprtk_simple_example_11_valgrind.log -v ./exprtk_simple_example_11 valgrind --leak-check=full --show-reachable=yes --track-origins=yes --log-file=exprtk_simple_example_11_valgrind.log -v ./exprtk_simple_example_11
valgrind --leak-check=full --show-reachable=yes --track-origins=yes --log-file=exprtk_simple_example_12_valgrind.log -v ./exprtk_simple_example_12 valgrind --leak-check=full --show-reachable=yes --track-origins=yes --log-file=exprtk_simple_example_12_valgrind.log -v ./exprtk_simple_example_12
valgrind --leak-check=full --show-reachable=yes --track-origins=yes --log-file=exprtk_simple_example_13_valgrind.log -v ./exprtk_simple_example_13
clean: clean:
rm -f core.* *~ *.o *.bak *stackdump gmon.out *.gcda *.gcno *.gcnor *.gch rm -f core.* *~ *.o *.bak *stackdump gmon.out *.gcda *.gcno *.gcnor *.gch

11
exprtk.hpp
View File

@ -13030,7 +13030,11 @@ namespace exprtk
next_token(); next_token();
break; break;
} }
else if (!token_is(seperator))
bool is_next_until = peek_token_is(token_t::e_symbol) &&
peek_token_is("until");
if (!token_is(seperator) && is_next_until)
{ {
set_error( set_error(
make_error(parser_error::e_syntax, make_error(parser_error::e_syntax,
@ -15324,6 +15328,11 @@ namespace exprtk
return (lexer_.peek_next_token().type == ttype); return (lexer_.peek_next_token().type == ttype);
} }
inline bool peek_token_is(const std::string& s)
{
return (details::imatch(lexer_.peek_next_token().value,s));
}
template <typename Type> template <typename Type>
class expression_generator class expression_generator
{ {

2
exprtk_simple_example_01.cpp
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@ -36,7 +36,7 @@ void trig_function()
exprtk::parser<T> parser; exprtk::parser<T> parser;
parser.compile(expression_string,expression); parser.compile(expression_string,expression);
for (x = T(-5.0); x <= T(+5.0); x += 0.001) for (x = T(-5); x <= T(+5); x += T(0.001))
{ {
T y = expression.value(); T y = expression.value();
printf("%19.15f\t%19.15f\n",x,y); printf("%19.15f\t%19.15f\n",x,y);

22
exprtk_simple_example_04.cpp
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@ -32,12 +32,15 @@ void fibonacci()
compositor_t compositor; compositor_t compositor;
compositor compositor
.add("fibonacci_impl", .add("fibonacci",
"switch " " var w := 0; "
"{ " " var y := 0; "
" case x == 0 : 0; " " var z := 1; "
" case x == 1 : 1; " " switch "
" default : " " { "
" case x == 0 : 0; "
" case x == 1 : 1; "
" default : "
" while ((x -= 1) > 0) " " while ((x -= 1) > 0) "
" { " " { "
" w := z; " " w := z; "
@ -45,12 +48,7 @@ void fibonacci()
" y := w; " " y := w; "
" z " " z "
" }; " " }; "
"} ", " } ",
"x","y","z","w");
compositor
.add("fibonacci",
"fibonacci_impl(x,0,1,0)",
"x"); "x");
T x = T(0); T x = T(0);

38
exprtk_simple_example_10.cpp
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@ -39,29 +39,25 @@ void newton_sqrt()
compositor_t compositor(symbol_table); compositor_t compositor(symbol_table);
compositor
.add("newton_sqrt_impl",
"switch "
"{ "
" case x < 0 : -inf; "
" case x == 0 : 0; "
" case x == 1 : 1; "
" default: "
" ~{ "
" z := 100; "
" y := x / 2; "
" repeat "
" y := (1 / 2) * (y + (x / y)); "
" if (equal(y * y,x)) "
" break[y]; "
" until ((z -= 1) <= 0); "
" }; "
"} ",
"x","y","z");
compositor compositor
.add("newton_sqrt", .add("newton_sqrt",
"newton_sqrt_impl(x,0,0)","x"); " switch "
" { "
" case x < 0 : -inf; "
" case x == 0 : 0; "
" case x == 1 : 1; "
" default: "
" ~{ "
" var z := 100; "
" var y := x / 2; "
" repeat "
" y := (1 / 2) * (y + (x / y)); "
" if (equal(y * y,x)) "
" break[y]; "
" until ((z -= 1) <= 0); "
" }; "
" } ",
"x");
std::string expression_str = "newton_sqrt(x)"; std::string expression_str = "newton_sqrt(x)";

3
exprtk_simple_example_11.cpp
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@ -29,7 +29,7 @@ void square_wave2()
typedef exprtk::parser<T> parser_t; typedef exprtk::parser<T> parser_t;
std::string wave_program = std::string wave_program =
" r := 0; " " var r := 0; "
" for(i := 0; i < 1000; i += 1) " " for(i := 0; i < 1000; i += 1) "
" { " " { "
" r += (1 / (2i + 1)) * sin((4i + 2) * pi * f * t); " " r += (1 / (2i + 1)) * sin((4i + 2) * pi * f * t); "
@ -52,7 +52,6 @@ void square_wave2()
expression.register_symbol_table(symbol_table); expression.register_symbol_table(symbol_table);
parser_t parser; parser_t parser;
parser.enable_unknown_symbol_resolver();
parser.compile(wave_program,expression); parser.compile(wave_program,expression);

98
exprtk_simple_example_13.cpp Normal file
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@ -0,0 +1,98 @@
/*
**************************************************************
* C++ Mathematical Expression Toolkit Library *
* *
* Simple Example 13 *
* Author: Arash Partow (1999-2014) *
* URL: http://www.partow.net/programming/exprtk/index.html *
* *
* Copyright notice: *
* Free use of the Mathematical Expression Toolkit Library is *
* permitted under the guidelines and in accordance with the *
* most current version of the Common Public License. *
* http://www.opensource.org/licenses/cpl1.0.php *
* *
**************************************************************
*/
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <string>
#include "exprtk.hpp"
template<typename T>
void savitzky_golay_filter()
{
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
std::string gsfilter_program =
" var weight[9] := "
" { "
" -21, 14, 39, "
" 54, 59, 54, "
" 39, 14, -21 "
" }; "
" "
" var lower_bound := trunc(weight[] / 2); "
" var upper_bound := v_in[] - lower_bound; "
" "
" if (v_in[] >= weight[]) "
" { "
" for (i := lower_bound; i < upper_bound; i += 1) "
" { "
" v_out[i] := 0; "
" for (j := 0; j < weight[]; j += 1) "
" { "
" v_out[i] += weight[j] * v_in[i + j]; "
" }; "
" v_out[i] /= 231; "
" }; "
" } ";
const std::size_t n = 1024;
std::vector<T> v_in;
std::vector<T> v_out;
const T pi = T(3.141592653589793238462);
srand(time(0));
// Generate a signal with noise.
for (T t = T(-5); t <= T(+5); t += T(10.0 / n))
{
T noise = T(0.5 * (rand() / (RAND_MAX + 1.0) - 0.5));
v_in.push_back(sin(2.0 * pi * t) + noise);
}
v_out.resize(v_in.size());
symbol_table_t symbol_table;
symbol_table.add_vector("v_in" , v_in);
symbol_table.add_vector("v_out",v_out);
expression_t expression;
expression.register_symbol_table(symbol_table);
parser_t parser;
parser.compile(gsfilter_program,expression);
expression.value();
for (std::size_t i = 0; i < v_out.size(); ++i)
{
printf("%10.6f\t%10.6f\n",v_in[i],v_out[i]);
}
}
int main()
{
savitzky_golay_filter<double>();
return 0;
}

3
readme.txt
View File

@ -968,7 +968,7 @@ example defines a vararg function called 'boo':
For the above denoted custom functions to be used in an expression, an For the above denoted custom functions to be used in an expression, an
instance of each function needs to be registered with a symbol_table instance of each function needs to be registered with a symbol_table
that has been associated with the expression instance. The following that has been associated with the expression instance. The following
demonstrations how all the pieces are put together: demonstrates how all the pieces are put together:
typedef exprtk::symbol_table<double> symbol_table_t; typedef exprtk::symbol_table<double> symbol_table_t;
typedef exprtk::expression<double> expression_t; typedef exprtk::expression<double> expression_t;
@ -1242,6 +1242,7 @@ int main()
(14) exprtk_simple_example_10.cpp (14) exprtk_simple_example_10.cpp
(15) exprtk_simple_example_11.cpp (15) exprtk_simple_example_11.cpp
(16) exprtk_simple_example_12.cpp (16) exprtk_simple_example_12.cpp
(17) exprtk_simple_example_13.cpp