Halcyon Calc
Halcyon Calc Lite
Poll
What feature do you want in Halcyon Calc v4.1
Stats plotting
15%
Implement the FORM operation
31%
Built-in catalog of operations
8%
Built-in catalog of units
8%
Printing support
0%
iCloud support for user variables
23%
Other (add a comment)
15%
Total votes: 13
EXGET
Argument Types:
Real
Expression
Result Type(s):
Real
Complex
Symbol
Expression
Invertible:
No
Valid In Expression:
No
Stack Diagram:
| Expression1 | Real2 | → | Item3 |
The EXSUB operation is used to retrieve a portion of an expression. The real argument identifies the subexpression 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. If the item at this offset is a real number, complex number or symbol, then the subexpression is that item itself. If the item at this offset is an operation, then the subexpression is the operation and its arguments.
So, for the expression 'SIN(X+10)', the subexpressions are:
| Index | Subexpression |
|---|---|
| 1 | 'SIN(X+10)' Expression |
| 2 | Symbol X |
| 3 | 'X+10' Expression |
| 4 | Real Number 10 |
The result of EXSUB is a real number, complex number, symbol or expression depending on what the subexpression is at that index. In the example able, EXGET would return 'X+10' if you look for the third subexpression.