Convert number to string problem

Question

Angus Wong 2019-4-10

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https://ww2.mathworks.cn/matlabcentral/answers/455502-convert-number-to-string-problem

编辑： Stephen23 2019-4-10

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.

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Alex Mcaulley 2019-4-10

What about str2double?

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Answer 1

madhan ravi 2019-4-10

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https://ww2.mathworks.cn/matlabcentral/answers/455502-convert-number-to-string-problem#answer_369952

编辑：madhan ravi 2019-4-10

在 MATLAB Online 中打开

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().

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Guillaume 2019-4-10

在 MATLAB Online 中打开

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 2019-4-10

编辑：madhan ravi 2019-4-10

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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Answer 2

Stephen23 2019-4-10

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https://ww2.mathworks.cn/matlabcentral/answers/455502-convert-number-to-string-problem#answer_369955

编辑：Stephen23 2019-4-10

在 MATLAB Online 中打开

>> 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'