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Solver Settings - Pattern for Jacobian

Settings → Solver → Pattern for Jacobian
Specifies as many as ten character strings that together establish the pattern for evaluating the Jacobian matrix during the modified Newton-Raphson solution for a dynamic, kinematic, or Initial conditions simulation. (To learn more about Newton-Raphson solutions, see the DEBUG statement in the Adams Solver online help.)
For each iteration, T or TRUE indicates that Adams Solver is to evaluate the Jacobian, and F or FALSE indicates that Adams Solver is not to evaluate the Jacobian, instead it is to use the previously calculated Jacobian matrix as an approximation of the current one. Therefore, cj determines whether or not Adams Solver is to evaluate the Jacobian at the jth iteration. If necessary, Adams Solver repeats the pattern of evaluations until it reaches the maximum number of iterations (set by the option Amaxit or Maxit).
 
For the option:
Do the following:
Category
Set to Pattern for Jacobian.
Integrator Pattern
Select a pre-defined pattern:
The default setting for Pattern varies base on the choice of integrator:
■Default: T:F:F:F:T:F:F:F:T:F (For GSTIFF and WSTIFF and for HHT/Newmark when FIXIT is specified)
■Default: F (For HHT/Newmark when FIXIT is not specified)
■Advanced - Indicates that you created a custom pattern by selecting More and setting options as explained below. Select More to see the custom pattern. Not available until you created a custom pattern.
Note: Selecting a pattern to request less frequent evaluations of the Jacobian matrix can decrease the computation time, decreasing the cost and improving the response time. However, infrequent evaluations could also be more expensive since the modified Newton-Raphson algorithm might require more iterations due to the slower convergence rates.
More
Select to create your own pattern.
Specify Pattern for
Set the type of solution for which you are setting the Jacobian pattern.
Number of Entries
Enter the number of TRUE's and FALSE's. The number of T’s or TRUE’s and F’s or FALSE’s together must be at least one and no more than 10.
Pattern
Click a box to set the pattern. A check mark indicates TRUE.