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Anonymous
Not applicable

Alternate State - $:: versus P()

What is the difference between

$:: versus P() in alternate state.


I have tried this out but I am not able to see any difference between those. Can some one explain the difference with an example that would be very helpful:


By definition:

$:: - literally referring to the selection made in the field in the $state.

P() -  all possible (p) values of the field in the$ state


Thanks in advance


1 Reply
santiago_respane
Specialist
Specialist

Hi,

this is from the help file:

Set Modifiers with implicit field value definitions

In the above examples, all field values have been explicitly defined or defined through searches. There is however an additional way to define a set of field values by the use of a nested set definition.

In such cases, the element functions P() and E() must be used, representing the element set of possible values and the excluded values of a field, respectively. Inside the brackets, it is possible to specify one set expression and one field, e.g. P({1} Customer). These functions cannot be used in other expressions:

Examples:

sum( {$<Customer = P({1<Product={‘Shoe’}>} Customer)>} Sales )
returns the sales for current selection, but only those customers that ever have bought the product ‘Shoe’. The element function P( ) here returns a list of possible customers; those that are implied by the selection ‘Shoe’ in the field Product.

sum( {$<Customer = P({1<Product={‘Shoe’}>})>} Sales )
same as above. If the field in the element function is omitted, the function will return the possible values of the field specified in the outer assignment.

sum( {$<Customer = P({1<Product={‘Shoe’}>} Supplier)>} Sales )
returns the sales for current selection, but only those customers that ever have supplied the product ‘Shoe’. The element function P( ) here returns a list of possible suppliers; those that are implied by the selection ‘Shoe’ in the field Product. The list of suppliers is then used as a selection in the field Customer.

sum( {$<Customer = E({1<Product={‘Shoe’}>})>} Sales )
returns the sales for current selection, but only those customers that never bought the product ‘Shoe’. The element function E( ) here returns the list of excluded customers; those that are excluded by the selection ‘Shoe’ in the field P
roduct.


I think that the difference lies on that P() can do indirect searches, not just only the current selections.

Please let me know if this helps.

Kind regards,