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LabVIEW
Function and VI
Reference Manual
LabVIEW Function and VI Reference Manual
VI Reference Overview
May 1997 EditionPart
Number 321526A-01
© Copyright 1997 National Instruments Corporation. All rights reserved.

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©
National Instruments Corporation v LabVIEW Function and VI Reference Manual
Contents
About This Manual
Organization of the Product User Manual .......................................................................xxiii
Conventions Used in This Manual...................................................................................xxiv
Related Documentation....................................................................................................xxv
Related Online Documentation........................................................................................xxvi
Customer Communication...............................................................................................xxvi
Chapter 1
Introduction to the LabVIEW Functions and VIs
Locating the G Functions and VIs...................................................................................1-1
Function and VI Overviews.............................................................................................1-2
Structures...........................................................................................................1-2
Numeric Functions ............................................................................................1-3
Boolean Functions.............................................................................................1-3
String Functions.................................................................................................1-3
Array Functions.................................................................................................1-3
Cluster Functions...............................................................................................1-4
Comparison Functions.......................................................................................1-4
Time and Dialog Functions ...............................................................................1-4
File I/O Functions..............................................................................................1-4
Advanced Functions..........................................................................................1-4
DAQ ..................................................................................................................1-5
Instrument I/O ...................................................................................................1-5
Communication .................................................................................................1-5
Analysis VIs ......................................................................................................1-5
Select A VI... .....................................................................................................1-6
Tutorial ..............................................................................................................1-6
Instrument Driver Library .................................................................................1-6
User Library.......................................................................................................1-7

Contents
LabVIEW Function and VI Reference Manual vi
©
National Instruments Corporation
Section One: G Functions and VIs
Chapter 2
G Function and VI Reference Overview
G Functions Overview..................................................................................................... 2-2
Introduction to Polymorphism......................................................................................... 2-2
Polymorphism................................................................................................... 2-2
Unit Polymorphism........................................................................................... 2-2
Numeric Conversion ......................................................................................... 2-3
Overflow and Underflow .................................................................................. 2-5
Wire Styles........................................................................................................ 2-5
Chapter 3
Structures
Structures Overview........................................................................................................ 3-2
Chapter 4
Numeric Functions
Polymorphism for Numeric Functions............................................................................4-2
Polymorphism for Trig Functions..................................................................... 4-3
Polymorphism for Logarithmic Functions........................................................ 4-3
Polymorphism for Conversion Functions ......................................................... 4-4
Polymorphism for Complex Functions............................................................. 4-4
Arithmetic Function Descriptions ................................................................................... 4-4
Conversion Functions Descriptions................................................................................. 4-9
Trigonometric Functions Descriptions............................................................................ 4-14
Logarithmic Functions Descriptions ............................................................................... 4-18
Complex Function Descriptions...................................................................................... 4-20
Additional Numeric Constants Descriptions................................................................... 4-22
Chapter 5
Boolean Functions
Polymorphism for Boolean Functions............................................................................. 5-1
Boolean Function Descriptions ....................................................................................... 5-2
Chapter 6
String Functions
Overview of Polymorphism for String Functions ........................................................... 6-1
Polymorphism for String Functions.................................................................. 6-2
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