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* Don't add a header line to the file, Cumulus expects all lines to be data lines.
=== Editing daily summary in Cumulus ===
'''This section applies to Cumulus 1.x.y only - Cumulus MX v3.0.0 (checked at build 3043) does not provide an editor'''
The last command in '''Edit''' [[Cumulus_Screenshots#File.2FEdit.2FHelp_Menu |menu]] is ''dayfile.txt''. ''This is how you view'' the dayfile.txt from within Cumulus. This is a text editor, so you can type new values over those currently displayed, insert and delete rows, and it works best when at full screen.
Click the ''Help'' button for detailed instructions. Cumulus Help is comprehensive.
If a particular day does not exist as a row on the daily summary log, then 'create missing' can search the observations in the relevant monthly log, and calculate approximate highs, lows and totals to insert as an exta row in the daily summary log. These are approximate because the actual highs and lows for that day are quite likely to have occurred at moments in-between those that were logged.
If there is an error in ''dayfile.txt'', then it is most likely to be found when you are viewing its data on one of the screens for editing the monthly, annual or all-time extremes. Cumulus will illuminate its ''Error'' light if it finds an error in such cases and tell you the line/row number of the first found error, together with some details of the error it found. For example, if a row is blank, a row is duplicated, a field is corrupted, a field does not have an acceptable value, or a field is missing so subsequent fields are to the left of where they should be.
You can use this editor as follows:
*use '''insert''' key to add one or more missing rows (complete days) manually,
*correct individual values by over-typing,
*use '''delete''' key to remove an entire day (e.g. if you get a 'duplicate' error message),
*use '''Create missing''' button to insert missing rows (complete days) by reading from [[Monthly_log_files]] and automatically calculating the best approximations for each field for those missing days.
If you do have a 'duplicate' error, you need to decide which row to ''delete'', and whether to copy any values from that row into the row you are keeping to ensure the correct extremes are retained.
As an alternative to manual line ''insert'', you may wish to use a procedure for importing, and processing, pre-Cumulus observations into [[Monthly_log_files]]. Once there is data for required days in monthly logs, ''Create missing'' can insert the new rows for those days previously missing in dayfile.txt.
For ''Create missing'' a list of inserted records is produced in [[dayfileeditlog.txt]]. If just some fields are wrong in a particular row (meteorological day) on day file, then there is a [[Monthly_log_files#Using_Monthly_logs_to_deal_with_shorter_.28or_incomplete.29_dayfile.txt_records_for_particular_dates | workaround]] as at all current versions (up to 1.9.4) you can only use 'Create missing' to read from the [[Monthly_log_files]] if the whole day (a row starting with a date) is missing in ''dayfile.txt''.
=== Read this if you are not using the latest release of Cumulus ===
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