# How do I insert the comma marker for thousands into large numbers while printing to file or Command Line in MATLAB 7.7 (R2008b)?

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MathWorks Support Team on 18 Jan 2010
Commented: Stephen23 on 14 Nov 2023
I would like my numbers to appear with comma markers for thousands. For instance, I would like to display the number 1200387 as 1,200,387

MathWorks Support Team on 28 May 2021
Edited: MathWorks Support Team on 28 May 2021
To add comma separators between groups of three numbers to indicate the thousands place of a large number, save the following code to a file called "ThousandSep.m":
function out = ThousandSep(in)
%THOUSANDSEP adds thousands Separators to a 1x1 array.
% Example:
% ThousandSep(1234567)
import java.text.*
v = DecimalFormat;
out = char(v.format(in));
Then you can use the ThousandSep function (as defined above), to obtain a string with comma separated digits using the following line of code:
ThousandSep(123456778)
ans =
123,456,778

Toshiaki Takeuchi on 14 Nov 2023
Using pattern
vec = 123456789;
txt = string(vec);
pat1 = lookBehindBoundary(digitsPattern); % (?<=\d)
pat2 = asManyOfPattern(digitsPattern(3),1); % (\d{3})+
pat4 = pat1+pat3; % (?<=\d)(?=(\d{3})+\$)
replace(txt,pat4,",")
ans = "123,456,789"
Stephen23 on 14 Nov 2023
vec = 1234.56789;
txt = string(vec);
pat1 = lookBehindBoundary(digitsPattern); % (?<=\d)
pat2 = asManyOfPattern(digitsPattern(3),1); % (\d{3})+
pat4 = pat1+pat3; % (?<=\d)(?=(\d{3})+\$)
replace(txt,pat4,",")
ans = "1234.5,679"

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