Array with random date find all the date belonging to the month of January using strfind.

Hi everyone, I have an array 800*7 and in the 7 column content various date of the year 2015, my goal is to classify and plot the number of cells belonging to each month of the year. All the date are of the format dd/mm/yyyy so my plan is to use the function string find such as '01/2015' for january and numel the column to calculate the exact number of cell belonging to the month of january but something is wrong with my code:

ship_table; %800*7 array.
idx = strfind(ship_table(:,7),'01/2015'); % gives me a the 800 cells with either 4 or [].
        jan = numel(idx);
        fprintf(jan);

Could someone help please :)

[Azzi Abdelmalek]

post three lines of your data

[Arthur Hajaali]

here's three line of the data and actually I would like to extract in a new array the row of each cell that matches my initial string condition '01/2015'

Answer 1

[Azzi Abdelmalek]

Why you don't use ismember

a={1 2 3 '01/2015';4 5 66 '01/2015';1 7 4 '02/2015'}
idx = ismember(a(:,4),'01/2015')  .

Answer 2

[Azzi Abdelmalek]

You can use datetime function. Look at this example

a={1 2 3 '01/2015';4 5 66 '01/2015';1 7 4 '02/2015'}
c4=a(:,4)
a=datetime(c4,'InputFormat','MM/yyyy')
id=month(a)