If your constraint block contains multiple constraints, you should separate it into multiple constraint blocks. > block can have only one constraint, but you can use multiple constraint properties.Using MATLAB, you can write causal expressions in the M language using constraint blocks stereotyped with «ExpressionForMatlab», although calculation generally takes longer than when MAXIMA is used alone.PCE will invoke MAXIMA/MATLAB as a back-end process and communicate with them to resolve equations.Option #2 and #3 are only available to you if you have a MATLAB and/or MSMT installed.Output = x / 100 // laplace(x, 100, 100), note: we can use a comment Hence, evaluate the laplace using MAXIMA in advance, and replace the part of your constraint by the evaluated result like below: PCE cannot evaluate the following constraint: If you do not have MATLAB installed, a possible workaround would be to evaluate the unrecognized part of your expression using MAXIMA in advance, and replace the original expression with the evaluated result. Copy and pasting the exact code and recieve the following: syms xexpr - 2 x/ ( 1 +x 2 ) 2 F int (expr) Error using sym/subsindex (line 855) Invalid indexing or function definition. With MAXIMA alone, such constraint will not be recognized. Trialing the symbolic toolbox and attempting to run the Indefinite Integral of Univariate Expression example from the int function documentation. To be able to evaluate constraints containing fft or laplace, you should consider adopting either #2 or #3. Matlab's Symbolic Math Toolbox uses the Maple engine, so you can try the following: Physics:diff(L(t), ydot(t)), where L(t) is the Lagrangian that you want to differentiate with respect to the time derivative of coordinate y(t).

MATLAB (base) + MATLAB Symbolic Math Toolbox (MSMT).You can configure PCE to operate in the following 3 manners: MAXIMA and MATLAB (and Symbolic Math Toolbox) are only CAS tools that are currently supported. The PCE calls Computer Algebraic Systems (CAS) to solve equations for sets of attribute values, and monitoring the constraints you have defined.

Symbolic math toolbox error