EvalEquation
This function can be used to evaluate an equation written as string (char-array).
The basis of the function is the Shunting yard algorithm, as in the C#
example of: https://rosettacode.org/wiki/Parsing/Shunting-yard_algorithm
The shunting-yard algorithm is a method for parsing mathematical expressions
specified in infix notation to postfix notation.
Example
result = EvalEquation( '1+2/(2*3)');
disp(result)
1.3333
or with variables,
result = EvalEquation( 'y+x/(2*3)','x',2,'y',3);
disp(result)
3.3333
Supported operators: ^ * / + - ( ) > < == >= <=
Supported functions: sqrt abs sin cos tan asin acos atan exp sign round floor ceil
max(a,b) min(a,b)
Supported constants: pi
************************************************************************************************************************************
This function EvalEquationScript can be used to evaluate a list of equations
and finaly return one of the variables as result
result = EvalEquationScript(script, output_variable_name, variable1, value1, variable2, value2,....)
Example,
script = cell(5,1);
script{1}='a=1';
script{2}='b=a*2';
script{3}='%Calculate max of a,b time x';
script{4}='x=x+a';
script{5}='c=max(a,b)*x';
result = EvalEquationScript(script,'c','x',3);
引用
Dirk-Jan Kroon (2024). EvalEquation (https://www.mathworks.com/matlabcentral/fileexchange/68458-evalequation), MATLAB Central File Exchange. 取得済み .
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Start Hunting!バージョン | 公開済み | リリース ノート | |
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1.0.7 | Fixed bug in parsing a number like -1.e-31 |
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1.0.6 | Added text |
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1.0.5 | Added the missing file.. |
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1.0.4 | Added multi-line support in EvalEquationScript |
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1.0.3 | Now explicit support of arrays as value of an input variable.
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1.0.2 | Support for more operators and functions |
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1.0.1 | Added supported functions: sqrt abs sin cos tan asin acos atan exp
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1.0.0 |