Re: Comparing each record of a field and creating a new field
I do not know if this explanation helps, probably sunny can put it in simple words if this doesnt help !!!!
Peek() is a Inter record function where it pulls records from previously loaded data. So it accumulates the information from Text field and puts the field value into that TextAdded Field and reiterates record by record and appends with Text field.
See Peek() example from Reference manual.
peek(fieldname [ , row [ , tablename ] ] )
Returns the contents of the fieldname in the record specified by row in the internal table tablename. Data are fetched from the associative QlikView database.
Fieldname must be given as a string (e.g. a quoted literal).
Row must be an integer. 0 denotes the first record, 1 the second and so on. Negative numbers indicate order from the end of the table. -1 denotes the last record read.
If no row is stated, -1 is assumed.
Tablename is a table label, see Table Labels, without the ending colon. If no tablename is stated, the current table is assumed. If used outside the load statement or referring to another table, the tablename must be included.
peek( 'Sales' ) returns the value of Sales in the previous record read ( equivalent to previous(Sales) ).
peek( 'Sales', 2 ) returns the value of Sales from the third record read from the current internal table.
peek( 'Sales', -2 ) returns the value of Sales from the second last record read into the current internal table.
peek( 'Sales', 0, 'Tab1' ) returns the value of Sales from the first record read into the input table labeled Tab1.
Load A, B, numsum( B, peek( 'Bsum' ) ) as Bsum...; creates an accumulation of B in Bsum.