# A compact way to find single digit numbers (i.e. numbers between 0 and 9) and replace them with two digit numbers

5 次查看（过去 30 天）
Sim 2022-8-9

A compact way to find single digit numbers (i.e. numbers between 0 and 9) and replace them with two digit numbers ?
For example, from:
a = [ 8
12
15
76
3
99
0];
I would like to add a zero in front of the single digit numbers:
b = [08
12
15
76
03
99
00];
##### 9 个评论显示隐藏 8更早的评论
Sim 2022-8-11
I did not think to cause such a fuss :-) ....but the conversation is very interesting, thanks!

### 采纳的回答

John D'Errico 2022-8-9

In MATLAB, you CANNOT store a number in a numeric format as one that has a leading zero.
If you want to convert the numbers to character form, then it is trivial. One line is sufficient.
a = [ 8
12
15
76
3
99
0];
d = dec2base(a,10)
d = 7×2 char array
'08' '12' '15' '76' '03' '99' '00'
The result is no longer usable as a number though. It is effectively only a picture of a number at that point, or perhaps I should say a caricature, if you can stand the pun.
##### 1 个评论显示隐藏 无
Sim 2022-8-9
Thanks a lot! I would like to accept both of your answers!!!

### 更多回答（1 个）

dpb 2022-8-9
For what purpose and in what context? You will only be able to show the leading zeros if you convert the numeric values to some form of text in which case it's trivial
>> compose('%02d',a)
ans =
7×1 cell array
{'08'}
{'12'}
{'15'}
{'76'}
{'03'}
{'99'}
{'00'}
>>
Well, there is one other way --
>> categorical(ans)
ans =
7×1 categorical array
08
12
15
76
03
99
00
>>
but if you want a straight, ordinary double array to appear that way at the command line, just not possible.
##### 1 个评论显示隐藏 无
Sim 2022-8-9
Thanks a lot! I would like to accept both of your answers!!!

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!