Mathematica Make Value a Variable Again
How to | Clear My Definitions
When you set a value to a symbol, that value volition be used for the symbol for the unabridged Wolfram System session. Since symbols no longer in apply can introduce unexpected errors when used in new computations, clearing your definitions is very desirable.
Assign values to two symbols (x and y) and observe their sum:
Use Clear to articulate the definitions for x and y:
Observe that x and y no longer have values associated with them and are treated as symbols without definitions:
This command clears all the definitions fabricated during the electric current Wolfram System session:
Use ClearAll to clear not merely the values and definitions of symbols but also the attributes and messages associated with them.
Start with a part to output a range from 0 to some positive integer:
Detect that f returns an error when a list is given every bit the argument:
Now set f to be Listable, then that f maps over lists when lists are given as arguments:
Notice that afterwards f is cleared, the attribute Listable nonetheless remains:
Utilize ClearAll to clear attributes and messages as well:
Utilise ClearAttributes to clear only the attributes of a function and retain its definition.
Redefine f and ready it to be Listable as earlier:
Now use ClearAttributes and notice that while the definition of f remains, the Listable attribute is no longer present:
You can also use Unset (=.) to clear any values or definitions made to a symbol:
Remove volition remove a symbol completely until it is referenced again:
Referring to x volition bring it back into the Wolfram System session:
In the case of locally defined symbols, which shop values ready but for a specified portion of a program, definitions are cleared automatically subsequently use. Symbols can be locally defined by using Cake or Module.
Source: https://reference.wolfram.com/language/howto/ClearMyDefinitions.html
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