Function to format number as currency?

I would like to format the number as a $xxx,xxx,xxx.xx currency, what is the easiest way to do this?

Answer 1

Or using java:

% Formatting according to locale

j = java.text.NumberFormat.getCurrencyInstance();
j.format(1000.3243)

% Different currency

curr = java.util.Locale.US;
j = java.text.NumberFormat.getCurrencyInstance(curr);
j.format(1000.3243)

For a list of java.util.Locale.*: http://docs.oracle.com/javase/1.3/docs/api/java/util/Locale.html

Answer 2

function S = Sep1000Str(N)
S = sprintf('$%.2f', N);
S(2, length(S) - 6:-3:2) = ',';
S = transpose(S(S ~= char(0)));

I like this. By far the most efficient MatLab-based answer.

Indeed. Nice answer!

Answer 3

Using SPRINTF is the way to go, but getting the commas right is tricky. I turned this into a question for Cody to see what folks suggest there. Problem 495. Formatting currency numbers.

Here's my clunky MATLAB answer, but I like Oleg's Java solution better.

function str = disp_currency(amt)
    str = fliplr(sprintf('%10.2f',abs(amt)));
    str = regexprep(str,' ','');
    str = str(sort([1:length(str) 7:3:length(str)]));
    str(7:4:length(str)) = ',';
    str = ['$' fliplr(str)];
    if amt<0
        str = ['(' str ')'];
    end   
end

Answer 4

Hehe, everyone's got a different function. I wrote a pretty inefficient tail-recursive solution, which might not be the "MatLab way"... Jan's seems the best that uses MatLab features, but Oleg's would be the most correct. Some locales interchange the dot and comma (and I think sprintf will follow the locale for the '%.2f' part), so everyone else's answer (including mine) is just a fun hack =)

% eg: num2currency( 123456.789 );
function [s] = num2currency (n, idx)
    if isnumeric(n)
        nstr = sprintf('$%.2f', n);
        s = num2currency( nstr, length(nstr) - 5 );
    elseif ~ischar(n) || nargin ~= 2
        error( 'Invalid parameters' );
    elseif idx < 3
        s = n;
    else
        s = num2currency( [n(1:idx-1) ',' n(idx:end)], idx-3 );
    end
end