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- The following are limitations imposed by DAN:
-
- 1. The total number of characters in all strings (i.e. labeling and FILE
- names) must be less than 1024. The maximum length for a single
- string is 80 characters.
-
- 2. The maximum number of symbols (i.e. variables, constants,
- and sequential function calls) is 100.
-
- 3. The maximum number of simultaneously open files (i.e. number of
- different variables referenced in a statement or group of
- statements) is the number specified by the FILES= statement in
- your CONFIG.SYS file.
-
- 4. The first 16 characters of a variable name must be unique, and variable
- names must conform to DOS file naming rules. If the variable name
- matches the name of an existing file in the current directory, then the
- contents of that file will be replaced if the variable name appears
- on the left side of the equals sign in an assignment statement.
- +
- 5. The maximum number of internal instructions (i.e. length of Pseudo
- Code table created during compilation phase) is 1024. This
- corresponds to about 250 statements as the maximum length
- algorithm; but this of course depends on the complexity of the
- expressions in the algorithm.
-
- 6. ERASE, HARDCOPY, and PAUSE statements should not be grouped
- with any statement that contains a variable; otherwise the
- erase/hardcopy/pause will occur for each step time in the implicit
- loop.
-
- 7. Scaling and labeling information used for plots (YMIN, etc.) is taken
- from the values current at the time the first PLOT statement after an
- ERASE is executed. Hence statements which set these values should not
- be grouped with the PLOT statement.
-
- 8. WRITE statements must not be grouped with other WRITE statements.
- +
- 9. Only one ASCII data file can be processed with the READ function at a
- time. Grouped READ function calls correspond to multiple data fields
- within the same record (there must be one READ for each data field).
-
- 10.The maximum number of traces on a plot that can be properly
- labeled is 25.
-
- 11.If the OPER variable is used in a statement, and, during execution, the
- operator terminates his input before all steps in the implicit loop
- have been executed (by entering a Control-Z), then the last value
- entered by the operator will be used for all subsequent references to
- OPER; including those in subsequent statements. This is not true if
- the operator enters a value for each step time. Thus, given a = OPER;
- b = OPER; 'b' will be filled with the last value entered for 'a' if the
- operator terminates 'a' input by entering a Control-Z.
- +
- 12.DAN maintains the data for only the most recent FFT or inverse FFT. Do
- not use the FFTRE, FFTIM, FFTMAG, or FFTPHS functions in expressions
- that are input to the FFT or IFT procedures.
-
- 13.SMOOTHing is only applied to Pre-existing or Temporary variables (i.e.
- non-ASCII data files).
-
- 14.3D plots must use solid line segments and be drawn from front to back
- (i.e. from smaller Z axis values to larger Z axis values).
-
- 15.DAN's text editor only handles files up to 30000 characters in length.
-