
is defined. Choosing the step size Dt is generally a trade-off between the accuracy of
the approximate solution and the computational effort required to obtain the approximate
solution values.
Generally speaking, an assessment of whether the numerical value selected for Dt is reasonable
cannot be made on the basis of compa ring the approximate solution with the exact solution to the
continuous-time model. Analytical solutions are rare due to the complexity of most real-world
system models. A logical approach to finding an acceptable step size is to obtain approximate
solutions with different step sizes (an order of magnitude apart) and comparing the ...