GraphIt
Selecting Observations
12-12
Using the LI-6400
12
For example
"Obs" > 10
will include only those lines for which the Obs value is greater than 10. More
complicated statements are possible with appropriate use of parentheses:
("Obs" > 10) AND ("Photo" < 5.2)
includes all lines of data for which Obs is greater than 10, and Photo is less
than 5.2. Note that variable names are always quoted, and must match a vari-
able (column label) in the data set.
Table 1 lists some useful symbols for use in logic statements:
For this logical expression, spaces donÕt matter, so, for example
Table 9-1.
LPL keywords for logical expressions
LPL
Action
+ - * /
Add, subtract, multiply, divide
< >
Less than, greater than,
<= >=
Less than or equal, greater than or equal
<> ==
Not equal, is equal
AND OR
Logical and, logical or
Logic for selecting observations.
Examples:
"Obs" > 10
("Obs" > 10) AND ("Photo" < 5.2)
DelLn
¨
ClrEnd
¨
DelChar
¨
CapLock
¨
AnyChar
_
Figure 12-10. Entering selection logic. Put data set variable names in quotes.
The keyboard entry
line is inverse video
+
Содержание LI-6400
Страница 1: ...Using the LI 6400 Portable Photosynthesis System ...
Страница 15: ...Part I The Basics ...
Страница 16: ......
Страница 174: ...Making Measurements Answers to Questions 4 56 Using the LI 6400 4 ...
Страница 175: ...Part II Useful Details ...
Страница 176: ......
Страница 200: ...Standard Tools Power ON Hooks 5 24 Using the LI 6400 5 ...
Страница 214: ...Real Time Data Real Time Graphics 6 14 Using the LI 6400 6 ...
Страница 234: ...Environmental Control Light Control 7 20 Using the LI 6400 7 ...
Страница 244: ...Light Sensor Considerations Gallium Arsenide Phosphide GaAsP Sensor 8 10 Using the LI 6400 8 ...
Страница 288: ...Data Logging Making Your Own AutoPrograms 9 44 Using the LI 6400 9 ...
Страница 289: ...Part III Working With Files ...
Страница 290: ......
Страница 312: ...The LPL File System Troubleshooting 10 22 Using the LI 6400 10 ...
Страница 340: ...Downloading Files Using a Data Capture Program 11 28 Using the LI 6400 11 ...
Страница 375: ...Part IV Configuration Issues ...
Страница 376: ......
Страница 420: ...Defining User Variables Old Style vs New Style 15 18 Using the LI 6400 15 ...
Страница 454: ...Using an Energy Balance Further Reading 17 12 Using the LI 6400 17 ...
Страница 455: ...Part V Maintenance Troubleshooting ...
Страница 456: ......
Страница 572: ...Troubleshooting Useful Information 20 46 Using the LI 6400 20 ...
Страница 587: ...Diagnostics and Utilities Sys Utility Programs Using the LI 6400 21 15 EBVpd t C guess EBSatVap _EBvap_kPa ...
Страница 593: ...Part VI Programming ...
Страница 594: ......
Страница 622: ...Programming with LPL Compiler Directives 22 28 Using the LI 6400 22 ...
Страница 846: ...Index I 16 Using the LI 6400 ...