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

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Arash Partow
2021-01-01 00:00:00 +00:00
committed by ArashPartow
parent 93a9f44f99
commit 17ba4d15e2
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readme.txt
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@ -59,7 +59,7 @@ arithmetic operations, functions and processes:
(05) Functions: abs, avg, ceil, clamp, equal, erf, erfc, exp,
expm1, floor, frac, log, log10, log1p, log2,
logn, max, min, mul, ncdf, nequal, root,
logn, max, min, mul, ncdf, not_equal, root,
round, roundn, sgn, sqrt, sum, swap, trunc
(06) Trigonometry: acos, acosh, asin, asinh, atan, atanh, atan2,
@ -124,7 +124,7 @@ The most recent version of the C++ Mathematical Expression Toolkit
Library including all updates and tests can be found at the following
locations:
(a) Download: http://www.partow.net/programming/exprtk/index.html
(a) Download: https://www.partow.net/programming/exprtk/index.html
(b) Repository: https://github.com/ArashPartow/exprtk
https://github.com/ArashPartow/exprtk-extras
@ -321,7 +321,7 @@ of C++ compilers:
+----------+---------------------------------------------------------+
| ncdf | Normal cumulative distribution function. (eg: ncdf(x)) |
+----------+---------------------------------------------------------+
| nequal | Not-equal test between x and y using normalised epsilon |
| not_equal| Not-equal test between x and y using normalised epsilon |
+----------+---------------------------------------------------------+
| pow | x to the power of y. (eg: pow(x,y) == x ^ y) |
+----------+---------------------------------------------------------+
@ -767,8 +767,8 @@ normally would in a program, and when the expression is evaluated the
current values assigned to the variables will be used.
typedef exprtk::symbol_table<double> symbol_table_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
symbol_table_t symbol_table;
expression_t expression;
@ -811,8 +811,8 @@ expansive discussion please review section [17 - Hierarchies Of
Symbol Tables]
typedef exprtk::symbol_table<double> symbol_table_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
symbol_table_t symbol_table0;
symbol_table_t symbol_table1;
@ -869,7 +869,7 @@ a false result due to one or more of the following reasons:
(2) Expression
A structure that holds an abstract syntax tree or AST for a specified
A structure that holds an Abstract Syntax Tree or AST for a specified
expression and is used to evaluate said expression. Evaluation of the
expression is accomplished by performing a post-order traversal of the
AST. If a compiled Expression uses variables or user defined
@ -1342,7 +1342,7 @@ noted:
Note: In example 6 from the above set, it is assumed the user defined
function foo has been registered as having a side_effect. By default
function foo has been registered as having a side-effect. By default
all user defined functions are assumed to have side-effects, unless
they are configured in their constructors to not have side-effects
using the 'disable_has_side_effects' free function. For more
@ -2322,8 +2322,8 @@ methods, composited functions and implicitly registering the functions
with the denoted symbol table.
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::function_compositor<T> compositor_t;
typedef typename compositor_t::function function_t;
typedef exprtk::function_compositor<T> compositor_t;
typedef typename compositor_t::function function_t;
symbol_table_t symbol_table;
@ -2351,11 +2351,11 @@ expression, an instance of each function needs to be registered with a
symbol_table that has been associated with the expression instance.
The following 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::parser<double> parser_t;
typedef exprtk::parser<double> parser_t;
typedef exprtk::function_compositor<double> compositor_t;
typedef typename compositor_t::function function_t;
typedef typename compositor_t::function function_t;
foo<double> f;
boo<double> b;
@ -2747,7 +2747,7 @@ expression that makes use of various elements of each symbol table is
then compiled and later on evaluated:
typedef exprtk::symbol_table<double> symbol_table_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::expression<double> expression_t;
// Setup global constants symbol table
symbol_table_t glbl_const_symbol_table;
@ -2908,8 +2908,8 @@ variables with the latter method using the 'unknown_symbol_resolver'
component.
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
symbol_table_t unknown_var_symbol_table;
@ -2981,8 +2981,8 @@ should raise a compilation error. The following example demonstrates a
simple user defined USR:
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
template <typename T>
struct my_usr : public parser_t::unknown_symbol_resolver
@ -3458,8 +3458,8 @@ redefined as a function taking degree input.
...
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
typedef typename parser_t::settings_store settings_t;
@ -3511,8 +3511,8 @@ expression will return normally.
" return [x, y, x + y, x - y, 'return-call 3'] ";
typedef exprtk::symbol_table<double> symbol_table_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
symbol_table_t symbol_table;
expression_t expression;
@ -3574,8 +3574,8 @@ itself to have the result variables be assigned the appropriate
values.
typedef exprtk::symbol_table<double> symbol_table_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
std::string expression_string =
" var x := 123.456; "
@ -3751,8 +3751,8 @@ expression's associated symbol table. In the following example, the
file I/O package is made available for the given expression:
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
exprtk::rtl::io::file::package<T> fileio_package;
@ -3980,9 +3980,9 @@ Simpson's rule. The integrate function has two overloads, where the
variable of integration can either be passed as a reference or as a
name in string form. Example usage of the function is as follows:
typedef exprtk::parser<T> parser_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
std::string expression_string = "sqrt(1 - (x^2))";
@ -4015,9 +4015,9 @@ where the variable of differentiation can either be passed as a
reference or as a name in string form. Example usage of the derivative
function is as follows:
typedef exprtk::parser<T> parser_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
std::string expression_string = "sqrt(1 - (x^2))";
@ -4054,9 +4054,9 @@ variable of differentiation can either be passed as a reference or as
a name in string form. Example usage of the second_derivative function
is as follows:
typedef exprtk::parser<T> parser_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
std::string expression_string = "sqrt(1 - (x^2))";
@ -4093,9 +4093,9 @@ variable of differentiation can either be passed as a reference or as
a name in string form. Example usage of the third_derivative function
is as follows:
typedef exprtk::parser<T> parser_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
std::string expression_string = "sqrt(1 - (x^2))";
@ -4310,7 +4310,7 @@ into account when using ExprTk:
of that symbol-table, otherwise the result will be undefined
behavior.
(10) Equal and Nequal are normalised-epsilon equality routines,
(10) Equal and not_equal are normalised-epsilon equality routines,
which use epsilons of 0.0000000001 and 0.000001 for double and
float types respectively.
@ -4517,9 +4517,9 @@ struct myfunc : public exprtk::ifunction<T>
int main()
{
typedef exprtk::symbol_table<double> symbol_table_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
typedef exprtk::parser_error::type error_t;
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
typedef exprtk::parser_error::type error_t;
std::string expression_str =
"z := 2 myfunc([4 + sin(x / pi)^3],y ^ 2)";