Add next and previous business date of each date in array row

Dear MATLAB experts,

I have a table named 'events', which contains many unique dates and I want to get the previous and next business dates of each date (row) included in this table. If one row were t, then I would like to get t-1 and t+1 (in business days), without these newly created rows replacing already existing ones, but creating one new row for each one of the newly created dates. I have thought of the code below, but it doesn't work so far:

% Create array
eventsWindow3 = table2array(events);
% Iterate through previous and next business date
for i=1:length(eventsWindow3)
    eventsWindow3(i-1,:) = busdate(eventsWindow3(i,:), -1);
    eventsWindow3(i+1,:) = busdate(eventsWindow3(i,:), 1);
end

You can find 'events' attached to this table.

I would really appreciate your help, thank you in advance.

Answer 1

[C B]

@chiefjia will this work?

% Create array
EventsArray = [datetime('today') datetime('yesterday') datetime('tomorrow')]
newArray = [];
% Iterate through previous and next business date
for i=1:length(EventsArray)
    newArray{end+1} = EventsArray(i)-1;
    newArray{end+1} = EventsArray(i);
    newArray{end+1} = EventsArray(i)+1;
end
newArray

EventsArray = 
  1×3 datetime array
   08-Oct-2021   07-Oct-2021   09-Oct-2021
newArray =
  1×9 cell array
  Columns 1 through 5
    {[07-Oct-2021 00:00:00]}    {[08-Oct-2021]}    {[09-Oct-2021 00:00:00]}    {[06-Oct-2021 00:00:00]}    {[07-Oct-2021]}
  Columns 6 through 9
    {[08-Oct-2021 00:00:00]}    {[08-Oct-2021 00:00:00]}    {[09-Oct-2021]}    {[10-Oct-2021 00:00:00]}

[chiefjia]

Hi Chetan,

thanks a lot for your response, this works. I've also adapted your suggestion to my code and this is what I got:

% Create array to iterate through previous and next business date
eventsWindow = table2array(events); % For setting up different event windows
eventsWindow3 = [];

% For loop that adds a row for each one of the business dates
for i=1:length(eventsWindow)
    eventsWindow3{end+1} = cellstr(datetime(busdate(eventsWindow(i), -1), 'ConvertFrom', 'datenum'));
    eventsWindow3{end+1} = eventsWindow(i);
    eventsWindow3{end+1} = cellstr(datetime(busdate(eventsWindow(i), 1),'ConvertFrom', 'datenum'));
end

[C B]

Nice to see you worked it out.

Answer 2

[KSSV]

d = datetime('today')

d = datetime
   08-Oct-2021

d0 = d-day(1)

d0 = datetime
   07-Oct-2021

d1 = d+day(1)

d1 = datetime
   09-Oct-2021

[chiefjia]

Hi KSSV,

I need to do this for each one of the rows in the table eventsWindow3. Also, when calculating the previous and next business date of the row being taken into account, a row would need to be added above the current date with the previous business date and another row below the current date with the next business date.

Your suggestion does not solve the problem

[KSSV]

You are running a loop for each event right? Then you have the date.

[chiefjia]

Yes, I am running a loop for each event, which is a row of the array eventsWindow3, but still I can't apply your solution