Is there a format in MATLAB to display numbers such that commas are automatically inserted into the display?

For large numbers, it helps for reading purposes if the digits are separated by commas. For example, I would like MATLAB to display one billion as

1,000,000,000

rather than

1000000000

Answer 1

[MathWorks Support Team]

The ability to automatically format a number to display it with the commas inserted at the right places for easy reading is not available in MATLAB.

To work around this issue, the number needs to be converted to a string. Then, commas can be inserted between the string characters. The following function achieves this purpose:

function [str]=num2bank(num)
   str = arrayfun(@(x) num2bankScalar(x) , num, 'UniformOutput', false) 
end

function [str]=num2bankScalar(num)
   num=floor(num*100)/100
   str = num2str(num)
   k=find(str == '.', 1)

   if(isempty(k))
       str=[str,'.00']
   end
  
       
   FIN = min(length(str),find(str == '.')-1)
   for i = FIN-2:-3:2
   str(i+1:end+1) = str(i:end)
   str(i) = ','
   end
end

[tmozdzen]

Ugh! Sorry - not to your solution, but to Matlab not supporting this format style naturally.

Answer 2

[Ted Shultz]

A simple way is to add this two line function:

function numOut = addComma(numIn)
   jf=java.text.DecimalFormat; % comma for thousands, three decimal places
   numOut= char(jf.format(numIn)); % omit "char" if you want a string out
end

Hope that helps! --ted

[Robert Hartman]

Worked great!

Answer 3

[amir soheil]

function strnumnew=addvilgole2(num)
if isnumeric(num)==1
    strnum=num2str(num);
    strnum2=regexprep(fliplr(strnum),' ','');
else
    if ischar(num)==1
        if sum(ismember(num,','))==0
        strnum2=regexprep(fliplr(num),' ','');
        end
    end
end

if isempty(str2num(strnum2))==0

strnum3=[];
for i=1:size(strnum2,2)
    iv=logical(abs(double(logical(i-fix(i/3)*3))-1));
    if iv
        if i~=size(strnum2,2)
            strv=[strnum2(1,i) ','];
        else
            strv=strnum2(1,i);
        end
    else
        strv=strnum2(1,i);
    end

      strnum3=[strnum3 strv];
  end
  strnumnew=fliplr(strnum3);
  else
  strnumnew=num;    
  end

%end function

example

addvilgole2(22222)

ans =

22,222

addvilgole2('22222')

ans =

22,222

addvilgole2('b222222')

ans =

b222222