APLX Help : Help on APL language : Errors : Error Messages
Error Messages
The various error messages that APLX will generate are shown below:
Message Problem and corrective action ─────── ─────────────────────────────
AXIS ERROR The axis used is incorrect or the operator is
not defined with axis or the axis specification
contains invalid characters.
BUFFER FULL Input line too long.
Action: interrupt the display and shorten the
line.
COMPONENT NOT IN FILE The file does not contain the specified
component, or the function was not found in
the shared library.
COPY BUFFER FULL Name list of )COPY command is too long.
Action: shorten name list.
DATA DAMAGED Error detected in the internal format of a
variable.
DEFN ERROR When using ∇ to create function:
- function name duplicates name of an object
already in the workspace, invalid header
Action: change name of either, or erase
object, correct the header.
- the name you have used is invalid or locked.
When using ∇ to edit a function:
- you've included the argument names with
the function name when attempting to edit
an existing function.
- the function is locked.
- the function is pendant. (see the section on
Error Handling)
When editing body of function:
- improper attempt at function line editing,
for example a [, a number, but no closing ].
DISK FULL File dataspace is full
DOMAIN ERROR You've used an APL function, but the
arguments you have supplied are outside the
domain of that function. For example:
- You've tried to divide by zero.
- You've tried to use one of the arithmetic
functions (+ - × ÷) with characters
- You've used fractional numbers with
functions which require whole numbers (e.g.
monadic ⍳ or ?)
FILE ALLOCATION EXCEEDED The file has reached its maximum allowed size
FILE IN EXISTENCE Attempt to rename a file to an I.D. which
already exists
FILE I/O ERROR The host operating system has signalled to APL
an error in some disc-related operation
FILE LOCKED An incorrect file password has been used
FILE NOT IN SYSTEM The file that is being accessed does not exist
FILE OR COMPONENT HELD The operation cannot be performed due to an
outstanding file or component hold by another
user
INCORRECT COMMAND You've typed a command starting with ), but
the remainder of the command is not correct or
not recognised.
INDEX ERROR When carrying out an indexing operation, you
have used an invalid index. For example:
- You have asked for element [5] of a 4
element vector
INTERRUPT User interrupt.
I/O ERROR APL encountered an error during input/output.
Probably hardware failure or illegal ⎕MOUNT
table.
LENGTH ERROR Arguments are of unequal lengths, or the axes
where the lengths of the arguments must
match are unequal. For example:
2 3 + 3 4 5
LOGICAL UNIT NOT FOUND The logical unit requested does not exist,
or the shared library was not found, or the
external class was not found.
NONCE ERROR The expression you have typed is syntactically
correct, but the interpreter does not support
it at the moment.
NO SPACE Not enough disc space to perform )COPY or
)SAVE command
NOT COPIED.... Attempt to )PCOPY an object which exists in the
active workspace.
NOT ERASED.... The objects shown were not found by the )ERASE
operation.
NOT FOUND..... Workspace does not contain the object.
Action: check spelling of workspace or object
name.
NOT GROUPED,NAME IN USE Variable or function already has the name;
Action:change name of group or erase conflicting
object
NOT SAVED: THIS WS IS WSID Normally occurs on attempt to save a
workspace using a name which is not that of
the active workspace and which duplicates the
name of a workspace in the library. You have
used the )SAVE command in the form
)SAVE NAME
to rename and SAVE the workspace.
Action: rename the active workspace using
)WSID, then save.
NOT SAVED, WS LOCKED Occurs on attempt to save an active workspace
with the same name as, but a different
password from, a workspace already in the
library. A locked workspace cannot be loaded,
dropped, copied or saved-over without
knowing the correct password. To change a
password on a saved workspace, )LOAD the
workspace, )DROP the workspace, then resave
with a new password.
Action: change the password of the active
workspace using )WSID.
NOT WITH OPEN DEFINITION The command cannot be processed while you
are editing a function.
Action: close the definition with ∇ and re-
issue the command.
RANK ERROR Function not defined for data of this structure
or arguments are of incompatible rank.
Action: provide argument of correct structure
(single number/character, vector, matrix, etc)
SI DAMAGE A pendant or suspended function has been
replaced or removed by )COPY or )ERASE. Label
lines of a suspended function have been
edited. A function not at the top of the SI
list has been edited, erased or copied. A
function on the SI list has had its header
edited.
Action: clear the state indicator by )SICLEAR.
STRUCTURED CONTROL ERROR A Structured Control keyword has been encountered
but the context is wrong. For example, an :End
may have been encountered but there is no current
block active, or you have branched into an
indented block.
Action: Check the block structure keywords
match up.
SYMBOL TABLE FULL Too many names in use for the current symbol
table size.
Action: )SAVE the current workspace, )CLEAR the
active workspace, increase the size of the
symbol table using )SYMBOLS, )COPY the saved
workspace back into the active workspace.
SYNTAX ERROR Ill-formed expression, or incorrect number of
arguments for a function. For example:
- You have used a one argument function
without a right argument.
- You have unbalanced parentheses
SYSTEM ERROR An internal hardware or software problem
such as a memory fault. After this error a
clear workspace is loaded automatically.
SYSTEM LIMIT One of the system limits has been exceeded, for
example the rank of an array.
UNAUTHORISED FILE ACCESS The file's access matrix does not allow the
operation from this user number.
Action: modify access matrix
USER ALLOCATION EXCEEDED User has too many files or the aggregate size
of the file exceeds the user's quota.
VALENCE ERROR A function has been used with too many or too
few arguments - for example a left argument for
a monadic function or a right argument only for
a dyadic function.
VALUE ERROR The name you've asked for does not exist, or
you have referred to the result of a function
which does not return a result.
WS FULL Insufficient workspace. The active workspace
cannot contain all the objects requested.
During a )COPY command no objects are copied.
Action: erase some variables or functions to
make more space. Clear the state indicator
using )SICLEAR.
WS LOCKED You have used an incorrect password for a
workspace that was saved with a password.
WS NOT FOUND The workspace requested is not in the
specified library or logical unit.
Action: check the location of the workspace
and the spelling of the workspace name.
APLX Help : Help on APL language : Errors : Error Messages