How do I write a function to convert numerical month of the year to the name of that month?

Question

Jim Hamill 2014-11-19

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https://ww2.mathworks.cn/matlabcentral/answers/163443-how-do-i-write-a-function-to-convert-numerical-month-of-the-year-to-the-name-of-that-month

编辑： Adam Danz 2020-1-27

I am knew to matlab and am required to write and test a function that converts numerical month of the year to the name of that month(Assuming 1=January to 12=December). I have to do 3 variations of this, one with "if", one with "else if" and the other with "switch". I would just like to know which function would be suitable to perform this operation.

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Answer 1

Image Analyst 2014-11-19

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Hints (probably too much of a hint):

months = {'January', 'February', 'March', 'April', 'May', 'June', ...
  'July', 'August', 'September', 'October', 'November', 'December'};
monthNumber = 3;  % Whatever .. use inputdlg() to ask user.
if monthNumber > 1 && monthNumber < length(months)
  theMonth = months{monthNumber}
end
switch monthNumber
  case {1,2,3,............. You finish it!
    fprintf('You picked month %s\n', months..... You finish it!
  otherwise
    fprintf('Invalid month number of %d', monthNumber);
end

You're going to have to finish/fix it and add the elseif to the "if" case to alert user to the invalid month. If you want to do it with 11 elseif's and check every number from 1 to 12 individually, you can do that, but it's really completely unnecessary since you can get the month with a simple index into the months array.

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Jim Hamill 2014-11-20

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    I have given this a go but still do not think I have quite got it. I have to then Write a test script called TestMonths which uses a for loop, to display all the names from each function month2nameA, month2nameB, month2nameC. 
    The name of each month should appear together 3 times (I.e. once for each 
    function, then move to the next month in the list/loop). I have written my first function as follows:
function [months] = month2nameA (MonthNumber)
months = {'January', 'February', 'March', 'April', 'May', 'June', ...
  'July', 'August', 'September', 'October', 'November', 'December'};
monthNumber = 3; %I'm not sure how to use inputdlg() correctly, is there  
                 %another way of prompting the number or is this the only way
if monthNumber > 1 && monthNumber < length(months)
  theMonth = months{monthNumber}
end
My second function is:
function [months] = month2nameB (MonthNumber)
months = {'January', 'February', 'March', 'April', 'May', 'June', ...
  'July', 'August', 'September', 'October', 'November', 'December'};
monthNumber = ;
if monthNumber > 1 && monthNumber < length(months)
  theMonth = months{monthNumber};
elseif monthNumber == 1
    theMonth = 'January';
elseif monthNumber == 12
    theMonth = 'December';
else
    theMonth = 'Invalid Month Number'
end
end

I assumed the elseif functions would be for returning the correct number for 1 and 12 as the monthNumber is between 1 and 12 but do not think this is the correct way to display it

The third function I am still very unsure about, I know it is not correct but is it somewhere along the lines of this:

function [months] = month2namec (MonthNumber)
switch (monthNumber);
  case {1,2,3,4,5,6,7,8,9,10,11,12};
    fprintf('You picked month %s\n', months{'January', 'February'...
            'March', 'April', 'May', 'June', 'July', 'August', 'September'...
            'October', 'November', 'December'});
  otherwise
    fprintf('Invalid month number of %d', monthNumber);
end
end

Any help with this would be greatly appreciated, thanks

Image Analyst 2014-11-20

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Try

fprintf('You picked month %s\n', months{monthNumber});

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Answer 2

Adam Danz 2020-1-27

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编辑：Adam Danz 2020-1-27

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Another method to return month names given month numbers using datetime and month,

monthNames = month(datetime(1, 1:6, 1), 's')
%      month numbers go here   ^^^^
% monthNames =
%   1×6 cell array
%     {'Jan'}    {'Feb'}    {'Mar'}    {'Apr'}    {'May'}    {'Jun'}