How can I return numbers into days of a specific month

Hello everyone, I have a matrix with size of 2688*2, each cell contains a number that represents a day in the month, for example from 1 to 31, but each number is repeated like 96 times or sometimes less or more, the matrix looks like something close to 1 1 1 1 1 1 1 (96 times) then 2 2 2 2 2 (90 times) and so on until 31 or 30 or 28 depending on the month, this month is January of 2007, how can i please return those numbers into day names, for example the first day which is 1 in the matrix was Thursday in January 2007 .

Thank you in advance very much guys

[Walter Roberson]

What is the difference between this and your earlier https://www.mathworks.com/matlabcentral/answers/355773-how-to-convert-numbers-to-days-names#answer_280805 ?

If the issue is that you do not have explicit month numbers to work with, then I showed you how to adjust for that in https://www.mathworks.com/matlabcentral/answers/357613-how-can-i-select-specific-rows-and-sum-the-values-later#answer_282455

[MAHMOUD ALZIOUD]

yes Mr Walter I tried the thing you sent, but it keeps giving three days together in the same matrix, for example it gives friday with tuesday and thursday. i still dont know what to do Sir

[Walter Roberson]

My code line

     day_of_week = weekday( datenum(entry_date) );

would give one result for each row of your data. The line

   monday_data = YourData(day_of_week == 2, :);

is then needed to select down to just Mondays.

[MAHMOUD ALZIOUD]

ok Sir, this is what i got: Undefined function or variable 'entry_date'.

[MAHMOUD ALZIOUD]

and: Cannot parse date 01

[MAHMOUD ALZIOUD]

i will convert it now to numerical values rather than strings and i think it will work

[Stalin Samuel]

For better understanding kindly attach the data or specify the data format clearly

[MAHMOUD ALZIOUD]

yes sure, this is the data, i tried the above codes but it doesnt give the accurate date, for example this data is for january 2007 and monday has the dates (1, 8, 15, 22 and 29), but in the code i used from above, monday has the dates (3, 10, 17 and 31 ) whih is not right, how can i please fix this