OBGET

Member Of Menu: 
Algebra
Argument Types: 
Real
Expression
Result Type(s): 
List
Invertible: 
No
Valid In Expression: 
No
Stack Diagram: 
Expression1 Real2 → List3

The OBGET operation is used to retrieve a portion of an expression and return it as an item in a list. The real argument identifies the component in the expression to retrieve. An expression is a sequence of real numbers, complex numbers, symbols and operations. If you read your expression from left to right, the left most item in that sequence is 1 and each item after that is the next number in the sequence.

So, for the expression 'SIN(X+10)', the components are:

Index Component
1 SIN Operation
2 Symbol X
3 + Operation
4 Real Number 10

To use OBGET on this expression, you would specify a number from 1 to 4 depending on which component you wanted to retrieve.

If you executed OBGET on index 3 on the above expression, the list { + } would be returned since the third item is the addition operation.