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EXTRACT

Description

The EXTRACT function is an alternative method of accessing values in a dynamic array other than using the <n,n,n> syntax. It takes the general form:

EXTRACT(expression1, expression2 {, expression3 {, expression4}})

Where:

  • expression1 specifies the dynamic array to work with and will normally be a previously assigned variable, 
  • expression2 specifies the field to extract, 
  • expression3 the value to extract and ,
  • expression4 the subvalue to extract.

Note:

expressions 2 through 4 should all return a numeric value or a runtime error will occur and the program will enter the debugger.

An example of use is as:

  A = "0"; A<2> = "1"; A<3> = "2"
  CRT EXTRACT(A, 2)

to display the value "1".


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