Feb 10, 2013 · I'm trying to return the number of appointments a person has (including if they have zero). Appointment contains the person_id and there is a person_id per appointment. So COUNT(person_id) is a sensible approach. The query: SELECT person_id, COUNT(person_id) AS "number_of_appointments" FROM appointment GROUP BY person_id;

I need to count the number of zero elements in numpy arrays. I'm aware of the numpy.count_nonzero function, but there appears to be no analog for counting zero elements. My arrays are not very large (typically less than 1E5 elements) but the operation is performed several millions of times.

Nov 7, 2011 · Note that we're taking advantage of the fact that COUNT() will only count non-NULL values to get a 0 COUNT result for those result set records that are made up only of data from the new ProjectYears table. Alternatively, you might only one 0 count record to be returned per project (or maybe one per financial_year). You would modify the above ...

Nov 8, 2012 · Major issue is on the base case we have here indented base case to count number 0 as one 1 no. of zeros, if we keep only either n==0 or n==1 as the base case then in case of n==0 the number 0 will be considered as 0 no. of zeros which is wrong also if we keep n==1 then it will add 1 extra while returning count

May 3, 2016 · df.groupby(['Symbol','Year']).count() I get . Action Symbol Year AAPL 2001 2 BAC 2002 2 I desire this (order does not matter) Action Symbol Year AAPL 2001 2 AAPL 2002 0 BAC 2001 0 BAC 2002 2 I want to know if its possible to count for zero occurances

Oct 3, 2013 · You can use countNonZero to count the number of pixels that are not black (>0) in an image. If you want to count the number of black (==0) pixels, you need to subtract the number of pixels that are not black from the number of pixels in the image (the image width * height).

First, COUNTIF returns 0 (zero), not "0". Get out of the habit of putting quotes around numeric values. That might be part of your problem. Second, if you use the TRIM and CLEAN functions, they do indeed return text. But that does not say whether or not the original values are text. Use ISTEXT or ISNUMBER to distinguish the type of value.

There is a way to count the number of columns that have zeros. This one uses dplyr . First, data.frame operation mode needs to be rowwise() then, columns must be subset with c_across() which returns a vector, that can be used in any function that takes vectors.

Nov 18, 2024 · For arbitrary-length integers, bin(n).count("1") is the fastest I could find in pure Python. I tried adapting Óscar's and Adam's solutions to process the integer in 64-bit and 32-bit chunks, respectively.

Jul 10, 2020 · Excel Count function returns "0" I have a very simple spreadsheet with one column showing values between 1 and 5. I used count to show how many cells had a value in them. the answer is an incorrect 0.