CALL SOFTMAX Routine

Returns the softmax value.

Category: Mathematical

Syntax

CALL SOFTMAX(argument<,argument,…> );

Required Argument

argument

is numeric.

Restriction The CALL SOFTMAX routine only accepts variables as valid arguments. Do not use a constant or a SAS expression because the CALL routine is unable to update these arguments.

Details

The CALL SOFTMAX routine replaces each argument with the softmax value of that argument. For example x j is replaced by
ε x j Σ i = 1 i = n ε x i
If any argument contains a missing value, then CALL SOFTMAX returns missing values for all the arguments. Upon a successful return, the sum of all the values is equal to 1.

Example

The following SAS statements produce these results.
SAS Statement
Result 
x=0.5;
y=-0.5;
z=1;
call softmax(x,y,z);
put x= y= z=;
 
 
x=0.3314989604 y=0.1219516523 z=0.5465493873
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