EvalEquation

This function can be used to evaluate an (list of) equation(s) written as string (char-array). It is based on the Shunting-yard algorithm
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Actualizado 13 Aug 2018

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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);

Citar como

Dirk-Jan Kroon (2024). EvalEquation (https://www.mathworks.com/matlabcentral/fileexchange/68458-evalequation), MATLAB Central File Exchange. Recuperado .

Compatibilidad con la versión de MATLAB
Se creó con R2018a
Compatible con cualquier versión
Compatibilidad con las plataformas
Windows macOS Linux
Categorías
Más información sobre String Parsing en Help Center y MATLAB Answers.

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Versión Publicado Notas de la versión
1.0.7

Fixed bug in parsing a number like -1.e-31

1.0.6

Added text

1.0.5

Added the missing file..

1.0.4

Added multi-line support in EvalEquationScript

1.0.3

Now explicit support of arrays as value of an input variable.
Also made compatible with Matlab Coder

1.0.2

Support for more operators and functions

1.0.1

Added supported functions: sqrt abs sin cos tan asin acos atan exp

1.0.0