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- *** SYSTEM DATA ***
- Directly after the system data are inputed, one way or the other,
- poles, zeros, gains, numerator and denominator polynomials and for
- discrete systems the sample time, are assigned to determined vari-
- ables. These variables, and therewith the data, are available in the
- whole program. The system to which these data belong, is the active
- system. When the next system is made active, the former system is
- stored on a page in the scratch pad. The scratch pad has 5 of these
- pages. When the 6th system is offered to the scratch pad, the system
- that was input first is deleted and therefore lost. You may leaf
- through the scratch pad with <PageDown>. With <Enter> you may
- activate the visible system, which is then removed from the scratch
- pad. The up till then active system is written to the scratch pad.
- To distinguish between systems on the scratch pad we may give them a
- name.
- Systems used in the program part MATRIX are represented by their
- state equations. However these systems also have poles, zeros and
- polynomials. These poles, zeros and polynomials are either active
- or written on the scratch pad. Every scratch pad page therefore has
- 4 subpages for 4 different sets of state equations of the same
- system. The subpages can only be made visible in the MATRIX program
- part.
-
- Page arrangement of the scratch pad
- ───────────────────────────────────
- poles and zeros state equations
- ┌──────────┐ ┌────────┐
- │ name │ │ name.1 │
- │ ├────┤ ┌──────┴─┐
- │ │ │ │ name.2 │
- │ │ │ │ ┌──────┴─┐
- │ │ └─┤ │ name.3 │
- └─────┬────┘ │ │ ┌──────┴─┐
- │ └─┤ │ name.4 │
- │ │ │ │
- v └─┤ │
- 5 X │ │
- └────────┘
- Save
- ────
- System data can be stored in a permanent file by pressing F2. This
- applies to the system data poles, zeros, gains, sampling time and
- polynomials. State data are stored under the MATRIX program. The
- data files with poles, zeros, gains and polynomials automatically
- have the extension .DFL. You must choose the main part of the file
- name. With <Alt-D> you may select another directory for your *.DFL
- files. The directory selection remains the same for subsequent *.DFL
- file operations, until you select another directory.
-
-
-
-
- Change
- ──────
- With F6 you may change data of the active system. The system order
- cannot be changed. Also systems on the scratch pad cannot be chan-
- ged. Press F6 and in the lower right corner of the screen a menu
- will appear. Select whether you want changes in poles and zeros, or
- in the polynomials, or (for analog systems only) in the corner
- frequencies of the Bode plot. After the selection the data are
- shown. You may select the variable you want to change with the arrow
- keys. The new value is typed in and is terminated with <Enter>. As
- soon as a change has happened, the system has no name. You may then
- enter a new name. When all the changes are input, you return to
- the active screen with F6. The system that was active before the
- change is written to the scratch pad.
- In the poles and zeros presentation you cannot change from real
- poles and zeros to complex ones. The other way round can be done
- in 2 steps: first you make the imaginary parts zero, then you return
- to the active screen, then you select change again and you give the
- real parts the desired values. The same procedure applies to the
- corner-frequencies presentation although there you must start by
- making the damping factor one.
- Delete
- ──────
- A not-active system may be deleted from the scratch pad. Select the
- system by paging (<PageDown>) and press <Del>. The program asks if
- you really want to delete the system. If so you answer with <Y>.
- After that the system is deleted from the scratch pad and its place
- becomes available for another system.
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