**THOPT**, * Refopt*,

`REFORMTOL`

`NTABPOINTS`

`TEMPMIN`

`TEMPMAX`

`--`

`ALGO`

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`Refopt`

Matrix reform option.

**FULL**—

Use the full Newton-Raphson solution option (default). All subsequent input values are ignored.

**QUASI**—

Use a selective reform solution option based on

.`REFORMTOL`

`REFORMTOL`

Property change tolerance for Matrix Reformation (.05 default). The thermal matrices are reformed if the maximum material property change in an element (from the previous reform time) is greater than the reform tolerance. Valid only when

= QUASI.`Refopt`

`NTABPOINTS`

Number of points in Fast Material Table (64 default). Valid only when

= QUASI.`Refopt`

`TEMPMIN`

Minimum temperature for Fast Material Table. Defaults to the minimum temperature defined by the

**MPTEMP**command for any material property defined. Valid only when= QUASI.`Refopt`

`TEMPMAX`

Maximum temperature for Fast Material Table. Defaults to the maximum temperature defined by the

**MPTEMP**command for any material property defined. Valid only when= QUASI.`Refopt`

**--**Reserved field.

`ALGO`

Specifies which solution algorithm to apply:

**0**—

Multipass (default).

**1**—

Iterative.

Valid only when

= QUASI.`Refopt`

The QUASI matrix reform option is supported by the ICCG, JCG, PCG, and sparse solvers only (**EQSLV**).

For * Refopt* = QUASI:

Results from a restart may be different than results from a single run because the stiffness matrices are always recreated in a restart run, but may or may not be in a single run (depending on the behavior resulting from the

setting). Additionally, results may differ between two single runs as well, if the matrices are reformed as a result of the`REFORMTOL`

setting.`REFORMTOL`

Midside node temperatures are not calculated if 20-node thermal solid elements (SOLID90 or SOLID279) are used.

For more information, see Solution Algorithms Used in Transient Thermal Analysis in the *Thermal Analysis Guide*.