vector containing strings in loop

Question

I want to create a vector containing strings in loop.

After creating the code my output should be a row matrix having 30 elements in a loop starting from 'Mon' ending on 'Tue'

My vector should contain these seven elements in a continuous loop 'Mon' , 'Tue' ,'Wed' , 'Thu' , 'Fri' , 'Sat' , 'Sun'

Please give me some idea

I would be bad in English as it's a second language for me so please try to bear grammatical errors.

rayryeng · Accepted Answer · 2015-05-26 16:25:44Z

4

You can't have these strings in a vector because each element in a vector is a single integral type, so a double, integer, character, etc. What you want is a set of characters per entry, and if you want that it's best to use a cell array.

You can first create a cell array of strings that contain Mon to Sun, then just index into it with a modulo operator:

>> A = {'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'};
>> B = A(mod(0:29, numel(A)) + 1)

B = 

  Columns 1 through 9

    'Mon'    'Tue'    'Wed'    'Thu'    'Fri'    'Sat'    'Sun'    'Mon'    'Tue'

  Columns 10 through 18

    'Wed'    'Thu'    'Fri'    'Sat'    'Sun'    'Mon'    'Tue'    'Wed'    'Thu'

  Columns 19 through 27

    'Fri'    'Sat'    'Sun'    'Mon'    'Tue'    'Wed'    'Thu'    'Fri'    'Sat'

  Columns 28 through 30

    'Sun'    'Mon'    'Tue'

I wouldn't use a loop here, but if you insist on using a loop, you can iterate over from 1 to 30 and use the same principle:

A = {'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'};
B = cell(1,30); %// Initialize empty cell array
for idx = 1 : 30 %// Going from 1 up to 30...
    index = mod(idx-1, numel(A)) + 1; %// Determine the right place to index into A
    B(idx) = A(index); %// Get corresponding day and place into output
end

You'll get the same answer as above.

edited May 26, 2015 at 16:25

answered May 26, 2015 at 16:20

rayryeng

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3 Comments

Santhan Salai Over a year ago

Wow! using mod here is clever!

rayryeng Over a year ago

@SanthanSalai - hehe thanks :) It just comes from experience. Usually when you populate elements in an array where elements repeat themselves or cycle back to the beginning from a smaller source array, mod is the way to go.

patrik Over a year ago

@AmmarNasser Note that pointers (c like languages) or references (eg. c++ or java) are not supported in matlab. Some types like Matlab cells use this built in, but, the developer cannot use pointers or references. Since a string is normally represented as an array of characters, this means that a vector of "strings" is really a vector of pointers, or references. This means that in a Matlab vector you can only have char. To have "strings", you need a type like cell, which store elements by its reference.

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