CASDIR Reserved Variables
The Computer Algebra System stored its reserved variables in a special directory called CASDIR.
Reserved Variable | What It Contains | Used By |
|
|
|
CASINFO | Graphic display temporary | |
| storage. |
|
ENVSTACK | Flags and current path. | PUSH, POP |
EPS | Maximum coefficient to | EPSX0 |
| round to zero. |
|
IERR | Error of integration | Numerical integration |
|
| operations |
MODULO | The current modulus. | MOD functions |
PERIOD | Period for periodic | Various CAS operations |
| operations. |
|
PRIMIT | Various CAS operations | |
| storage. |
|
REALASSUME | List of variables to treat as | Various CAS operations |
| real numbers in complex |
|
| mode. |
|
VX | Default variable for symbolic | Various CAS operations |
| operations. |
|
|
|
|
Contents of the CASDIR Reserved Variables
CASINFO
CASINFO provides temporary storage for the graphic display during
ENVSTACK
ENVSTACK is a variable stored in the CAS directory. It is used by PUSH and POP to save the status of flags and the current directory. (PUSH saves the data in ENVSTACK; POP restores it.)
EPS
EPS contains a real number specifying that coefficients in a polynomial smaller than this value are replaced with 0. It is used by the EPSX0 command. The default value is
IERR
IERR contains the error tolerance of integration during numeric integration.
Reserved Variables