# creating new number from two numbers

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Alex on 2 Dec 2014
Edited: Andrei Bobrov on 2 Dec 2014
if i need to create a new number from two given numbers for example : a=4 b=9 new number should be a times b (9999). is there a command to do that ?

Andrew Reibold on 2 Dec 2014
Edited: Andrew Reibold on 2 Dec 2014
Judging by your example, I believe you mean b repeated a times. Not a times b.
Yes there is a command for that.
repmat(b,1,a)
The first number is what is to be repeated. The second number is how many rows to be repeated across. The third number is how many columns to be repeated across.
Edit : This actually doesn't combine them into one number but puts it into a matrix. Combine after repeating? Not sure how to do in one step. Maybe another approach out there. If you don't mind turning the result into a string, combining them, then turning it to a number, that's what I would do.
##### 2 CommentsShowHide 1 older comment
Alex on 2 Dec 2014
i figured it out. tnx. i can print it out as i needed it using fprintf

Guillaume on 2 Dec 2014
Using conversion to string and back this is easy but maybe not fast:
repeat = 3;
number = 12;
repeatednumber = str2num(repmat(num2str(number), 1, repeat))
Guillaume on 2 Dec 2014
Or staying exclusively numeric:
repeat = 3;
number = 12;
temp = repmat(number, 1, repeat);
repeatednumber = sum(temp .* 10.^((numel(temp)-1:-1:0)*(1+floor(log10(number)))))

Andrei Bobrov on 2 Dec 2014
Edited: Andrei Bobrov on 2 Dec 2014
sum(10.^(a-1:-1:0)*b)
or
polyval(b*ones(1,a),10)
polyval(b*ones(1,a),10^ceil(log10(b)))

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