Convert number to string problem

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Angus Wong
Angus Wong on 10 Apr 2019
Edited: Stephen23 on 10 Apr 2019
I would like to ask if there is a way to output a number, which is stored as a variable, using simple commands, as shown in the following examples:
9 is converted to: 'The number is +9.'
6.54 is converted to: 'The number is +6.54.'
-7 is converted to: 'The number is -7.'
-9.2 is converted to: 'The number is -9.2.'
0 is converted to: 'The number is 0.'
I would like to display it in the command window and a message box (msgbox).
Please help. Thanks in advance.

Accepted Answer

madhan ravi
madhan ravi on 10 Apr 2019
Edited: madhan ravi on 10 Apr 2019
number = 10; % an example
if number>=0
sprintf('The number is : +%d',number)
else
sprintf('The number is : %d',number)
end
Assign a variable to sprintf() and then place it inside the command msgbox().
  5 Comments
Guillaume
Guillaume on 10 Apr 2019
Well, the first problem is that you use a different variable for each number instead of putting them all into a single array.
If the numbers were stored in a single array, your question is trivially solved in many ways. One way:
numbers = [9, 8, 0, -5, -6];
fprintf('The numbers are %s respectively.\n', strjoin(compose('%+d', numbers), ', '));
madhan ravi
madhan ravi on 10 Apr 2019
Edited: madhan ravi on 10 Apr 2019
Thank you Guillaume, Stephen’s solution looks good but anyways let me give my suggestion too, use logical indexing group according to positive and negative numbers and use sprintf() all at once.

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More Answers (1)

Stephen23
Stephen23 on 10 Apr 2019
Edited: Stephen23 on 10 Apr 2019
>> V = [9,8,0,-5,-6]; % your data should be in one array.
>> S = sprintf(', %+g',V(1:end-1));
>> S = sprintf('The numbers are%s and %+g respectively',S(2:end),V(end))
S = 'The numbers are +9, +8, +0, -5 and -6 respectively'
˜>> regexprep(S,'\+0([, ])','0$1') % if you don't like '+0'
ans = 'The numbers are +9, +8, 0, -5 and -6 respectively'

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