creating new number from two numbers
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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 ?
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Andrew Reibold
2014-12-2
编辑：Andrew Reibold
2014-12-2
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.
更多回答（2 个）
Guillaume
2014-12-2
Using conversion to string and back this is easy but maybe not fast:
repeat = 3;
number = 12;
repeatednumber = str2num(repmat(num2str(number), 1, repeat))
1 个评论
Guillaume
2014-12-2
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
2014-12-2
编辑：Andrei Bobrov
2014-12-2
sum(10.^(a-1:-1:0)*b)
or
polyval(b*ones(1,a),10)
add
polyval(b*ones(1,a),10^ceil(log10(b)))
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