Defining User Variables
15-2
Using the LI-6400
15
OPEN provides a method of extending the quantities computed beyond the
set of system variables described in the previous chapter. The user can define
variables (or constants) that can be viewed, logged and plotted, just like the
system variables can. This chapter explains how.
The ComputeList File
A ComputeList is simply a list of the variables and constants that you wish to
define. ComputeLists take the form of a file. These files are generally stored
in the
“/User/Configs/Comps”
directory.
Where Do They Come From?
There is a default ComputeList that implements the equations for photosyn-
thesis, conductance, and other useful quantities listed in
on page 1-7. This file is named
“/User/Configs/Comps/Default”
. There are two ac-
tions that will cause other ComputeList files to appear, besides the default
one:
¥
Creating a configuration from the Installation Menu
Some items have special ComputeLists associated with them, such as the
6400-09 Soil Flux Chamber, and the 6400-05 Conifer Chamber, so installing
those items will cause a new file to appear in the
/User/Configs/Comps
directory.
Also, just building a configuration for a more conventional chamber will, if
you choose to use energy balance for leaf temperature, create an energy bal-
ance version of
“Default”
named
“Default using EB”
or
“Clear bottom EB”
.
¥
Editing a ComputeList file, and saving under a new name
You can directly make a ComputeList file by editing an existing one (or start-
ing from scratch), and storing under a new name. You might do this to add a
computation that is not included in the default, or to change an equation,
should you not like the formula we used in the default.
ComputeList files can be specified as part of a configuration by using the
ComputeList=
Summary of Contents for LI-6400
Page 1: ...Using the LI 6400 Portable Photosynthesis System ...
Page 15: ...Part I The Basics ...
Page 16: ......
Page 174: ...Making Measurements Answers to Questions 4 56 Using the LI 6400 4 ...
Page 175: ...Part II Useful Details ...
Page 176: ......
Page 200: ...Standard Tools Power ON Hooks 5 24 Using the LI 6400 5 ...
Page 214: ...Real Time Data Real Time Graphics 6 14 Using the LI 6400 6 ...
Page 234: ...Environmental Control Light Control 7 20 Using the LI 6400 7 ...
Page 244: ...Light Sensor Considerations Gallium Arsenide Phosphide GaAsP Sensor 8 10 Using the LI 6400 8 ...
Page 288: ...Data Logging Making Your Own AutoPrograms 9 44 Using the LI 6400 9 ...
Page 289: ...Part III Working With Files ...
Page 290: ......
Page 312: ...The LPL File System Troubleshooting 10 22 Using the LI 6400 10 ...
Page 340: ...Downloading Files Using a Data Capture Program 11 28 Using the LI 6400 11 ...
Page 375: ...Part IV Configuration Issues ...
Page 376: ......
Page 420: ...Defining User Variables Old Style vs New Style 15 18 Using the LI 6400 15 ...
Page 454: ...Using an Energy Balance Further Reading 17 12 Using the LI 6400 17 ...
Page 455: ...Part V Maintenance Troubleshooting ...
Page 456: ......
Page 572: ...Troubleshooting Useful Information 20 46 Using the LI 6400 20 ...
Page 593: ...Part VI Programming ...
Page 594: ......
Page 622: ...Programming with LPL Compiler Directives 22 28 Using the LI 6400 22 ...
Page 846: ...Index I 16 Using the LI 6400 ...