When SAS encounters an uninitialized variable, it will output a note to the log that looks like this:
NOTE: Variable not_in_data is uninitialized.
Is it possible to have SAS output that message as a warning or an error instead?
In computing, an uninitialized variable is a variable that is declared but is not set to a definite known value before it is used. It will have some value, but not a predictable one. As such, it is a programming error and a common source of bugs in software.
"Uninitialized variables contain some value" is a incorrect statement which unfortunately is teached. A program who access an uninitialized variable has Undefined Behavior, which means it can have any behavior.
An uninitialized variable has an undefined value, often corresponding to the data that was already in the particular memory location that the variable is using. This can lead to errors that are very hard to detect since the variable's value is effectively random, different values cause different errors or none at all.
An uninitialized variable is a variable that has not been given a value by the program (generally through initialization or assignment). Using the value stored in an uninitialized variable will result in undefined behavior.
Yes (in 9.4 or later):
option varinitchk = error;
Default value is note
, other possible values are nonote
and warning
.
There is also undocumented feature that changes certain notes to errors. You can either set the option using option dsoptions = note2err
; or by adding / note2err
to a data statement. I found a list on SAS-L of the notes this option changes to errors:
19 Variable %*v is uninitialized.
97 Missing values were generated as a result of
98 Division by zero detected at %2q.
99 Mathematical operations could not be performed
108 Invalid numeric data, '%*s' , at %2q.
109 Invalid character data, %f , at %2q.
110 Invalid %sargument to function %b at %2q.
139 Argument to function %*s is not a known variable name: %*v.
140 Argument to function %*s is not a valid variable name: %*s.
205 Invalid argument(s) to the exponential operator "**" at %2q.
208 Invalid numeric data, %*s='%*s' , at %2q.
209 Invalid character data, %*s=%f , at %2q.
223 A number has become too large at %2q. %w%*s
224 A number has become too large during the compilation phase.
225 Division by zero detected during the compilation phase.
242 Invalid argument(s) to the exponential operator "**".
258 Invalid argument to function %*b at %2q.
259 Invalid first argument to function %*b at %2q.
260 Invalid second argument to function %*b at %2q.
261 Invalid third argument to function %*b at %2q.
262 Invalid fourth argument to function %*b at %2q.
267 Argument %d to function %*b at %2q is invalid.
356 The SUBSTR pseudo-variable function does not allow character
424 Character values have been converted to numeric
425 Numeric values have been converted to character
429 A number has become too large during the compilation phase,
430 Division by zero detected during the compilation phase,
484 Format %*b was not found or could not be loaded.
485 Informat %*b was not found or could not be loaded.
Source
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