filtering out two months with a code

Question

AA 2017-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/364445-filtering-out-two-months-with-a-code

回答： dpb 2017-11-1

dateless = Dates(nomatch);
datelike = Dates(~nomatch);
dateliketime=datetime(datelike);
liatime=dateliketime.Month == 10;
datelike1= datelike(liatime,1);

Here I select the month November from the group that is available. What if I want to select two months, i.e. November and October? Is there any way to display this?

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Answer 1

dpb 2017-11-1

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Month1 == 10;   % make variables instead of hardcoded
Month2 == 11;   % "magic" numbers
datelike1= datelike(iswithin(dateliketime.Month,Month1,Month2));

where iswithin is my "syntactic sugar" utility

function flg=iswithin(x,lo,hi)
% returns T for values within range of input
% SYNTAX:
%  [log] = iswithin(x,lo,hi)
%      returns T for x between lo and hi values, inclusive
    flg= (x>=lo) & (x<=hi);

If you convert your dates to datetime class, there is a "veritable plethora" of functions specifically for handling dates, date arithmetic and logic, including isbetween

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Answer 2

Cam Salzberger 2017-11-1

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In this code snippet, liatime will be a logical array, with true anywhere dateliketime.Month is 10, and false anywhere it isn't. So a good place to start looking would probably be under MATLAB's logical operations.

For your specific question, the logical OR operator (non-short-circuit version) should be sufficient:

liatime = dateliketime.Month == 10 | dateliketime.Month == 11;

-Cam