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# Re: [libreoffice-users] Calc: Calculate number of days until yesterday IE TODAY-1 to assist in array determination for COUNTIF?

Morning Brian,

On 2018/04/27 20:20, Brian Barker wrote:
At 18:04 27/04/2018 +0200, Hylton Conacher wrote:
I am running LibreOffice 5.4.6.2 and am using a spreadsheet to enable me to draw graphs based on rainfall received per year, up until the date prior to today. The figures also allow me to compare current rainfall to date to the same period in a previous year. I agree I should probably use Base but I do not think it would have solved the issue.

**Example Data***
,,,,,
Month,Day,M/D,2016,2017,2018,Average('16->'17)
Apr,1.04/01,3,0,1,1.5
Apr,2,04/02,0,8,0,4
,,,,,,
,,,,,,
,,,,,,
Apr,26,04/26,0,0,20,0

Assuming today is Apr 2nd, a formula to count how many days of rain there were in the current month would be =COUNTIF(\$F\$2:\$F2,">0").

Surely not? Rather something like =COUNTIF(\$F\$94:\$F94,">0").

Correctly extrapolated to the real data set as opposed to the example data set. Sorry, I just checked the example data set and I seemed to have mucked it up.

The Total amount of rain that fell on that number of days, being 1, was 1mm, ...

If we are talking 2018, that seems to be zero in your data.

You are correct and have extrapolated the formula to the REAL data set correctly.

... or taking it further 60% of the average rainfall to date for the month.

I don't know what fraction zero is of zero - as I'm not allowed to divide by zero. Does your mathematics allow this?

:) Apologies. 0 of 0 is still 0. I was using the example data so folk did not have to download the spreadsheet.

Assuming today is Apr 27, a formula to count how many days of rain there were in the current month is unknown, ...

Surely not? The current month (I think it's still 2018, unless some catastrophe has happened without my knowing) has apparently had six rainy days in your data.

Again you are correct, just using a different data set.

... especially as there are undoubtedly values in the other un-shown 81 cells i.e. 3yrs and 27 remaining days?

Where are these "unshown" cells - somewhere else, and not in this spreadsheet at all? And how can the "current month" - surely April 2018 - contain over three years' worth of days?

Disregard as I was referring to my example data as instead if writing values for 26/27 days across three years. You are looking at the REAL data set and there are NO missing values.

Basically take the starting cell reference \$F\$2 ...

Perhaps \$F\$3?
Again wrong data set. The F3 was based on the example data not REAL data.

Take the starting cell reference as you correctly identified as \$F94...

... and add the number of events that were ">0" to get the end reference for the COUNTIF formula.

Now you've lost me ...
If my starting reference is F94 SUM onto 94 the number of rows in column F those rows that are ">0", but only add them if the date is between the date of F94 i.e. 2018-04-01 and Yesterday's date.

=COUNTIF(\$F\$2:Add number of items ">0" to the starting line reference 2, to get the end of the COUNTIF range) i.e. being Apr 27, whilst there may be 26 days between the beginning of Apr and today i.e. Today()-1, there are only two instances in the above table where ">0" for a particular year, ...

Are you working with the current month - one month? Or with all the Aprils in three years - three non-contiguous months? Or with the period from 1 January 2016 up to yesterday? Or what?
I am working in a month for a year i.e. April in 2018

... thus making 2 the number of days it rained, ...

Correct

... to receive the SUM of the 2018 rainfall being 21mm

Er, 67 mm?
Correct

Incidentally, you have the value 119 in L2 to indicate yesterday's row number, but this has evidently been added manually and also must be updated so. It should be fairly easy to establish this automatically, and even to embed any such calculation in any formula.

Now this sounds promising. Can I reference a cell with a manually entered line number i.e. L2 on the REAL data has a value of 120 and use that value to complete a formula i.e. COUNTIF(\$F\$94:F(Value in L2), ">0") i.e. COUNTIF(\$F\$94:F120, ">0")

Sorry for the confusion. Next time I raise a query I am only going to refer to my REAL data.

Regards
Hylton

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