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

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

Answer 1

[MathWorks Support Team]

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)

The resulting answer is:

 
ans =
123,456,778

Answer 2

[Toshiaki Takeuchi]

Using pattern

vec = 123456789;
txt = string(vec);
pat1 = lookBehindBoundary(digitsPattern); % (?<=\d)
pat2 = asManyOfPattern(digitsPattern(3),1); % (\d{3})+
pat3 = lookAheadBoundary(pat2+lineBoundary("end")); % (?=(\d{3})+$)
pat4 = pat1+pat3; % (?<=\d)(?=(\d{3})+$)
replace(txt,pat4,",") 

ans = "123,456,789"

[Stephen23]

vec = 1234.56789;
txt = string(vec);
pat1 = lookBehindBoundary(digitsPattern); % (?<=\d)
pat2 = asManyOfPattern(digitsPattern(3),1); % (\d{3})+
pat3 = lookAheadBoundary(pat2+lineBoundary("end")); % (?=(\d{3})+$)
pat4 = pat1+pat3; % (?<=\d)(?=(\d{3})+$)
replace(txt,pat4,",") 

ans = "1234.5,679"