LI-COR LI-6400, Руководство пользователя

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Recomputing Data Files
Hints
13-14 Using the LI-6400
13
Hints
Suppressing a VariableÕs Recomputation
(OPEN 3.2 and above) Suppose you have a user defined variable that is based
on a mV signal from a sensor, but that mV signal was not stored in the file.
You would not want to recompute that variable, because all the new values
would be nonsense, since they would be based on that channel at the moment,
not the signals recorded during the original measurement. It is the Com-
puteList that controls whether or not a user defined variable can be skipped
over when recomputing. See
The ASSIGN() function on page 15-9.
Multiple (Appended) Files
If the source data file is actually a collection of multiple data sets (created by
specifying an existing file when opening the log destination, and choosing the
ÒAppendÓ option when notified that a file exists already), then there are some
constraints you should be aware of.
1 The program will recompute until the end of file is reached.
Blank lines, remarks, etc. will not stop it.
2 Only the first data header is considered
If you changed log formats, or compute lists, etc., they will not be taken into
consideration. If this is the case, you should split up the source file into mul-
tiple files, before recomputing.
3 Non-data lines:
(OPEN 3.01 and below). All lines that begin with a double quote are not re-
computed. Instead, they are copied as is to the destination. This means that
you cannot recompute data files that have a quoted string for the first data col-
umn.
(OPEN 3.2 and above). All lines that do not have enough data to meet the ex-
pected number of variables (string or numeric) are transferred as is to the des-
tination. The program will print out a Ò.Ó for each good data line, and a ÒxÓ
for any other line. Thus, if you see
.....x...xxxxxxxxx.....
It probably means if found a remark after 5 observations, and then after an-
other three observations, if found another data set appended on, with 4 obser-
vations. Or, someone logged nine remarks one after the other.