How do you add a 0 in front of single digit numbers in a numerical array?

I later want to convert 2 numerical arrays into a string array and then back to a numerical array to combine a series of numbers. HOWEVER - to do this the numbers need to have the same amount of integers otherwise I get an empty matrix.

So my question is, how would I tell matlab to put a 0 in front a singular numbers in a 1x56 numerical array so all the numbers have the same amount of digits?

[James Tursa]

Please show a small example of input(s) and desired output(s).

[per isakson]

"put a 0 in front a singular numbers in a 1x56 numerical array so all the numbers have the same amount of digits" That's not possible with a numerical array.

[Marissa Holden]

The string array changes each time I run a scrip and will contain different numbers. at the moment the string variable has 14.1, 13.22, 12.1, 1.3. I would want it to out put into a numerical variable 14.01, 13.22, 01.03

[per isakson]

"I would want it to out put into a numerical variable 14.01, 13.22, 01.03" As I said that is not possible.

However, "I would want it to out put into a character/string variable '14.01, 13.22, 01.03'" would have been possible.

[Marissa Holden]

Could I make another string variable that put a 0 in front of the single digits and then put that into a numerical array?

[per isakson]

There is no such thing as leading zeros when it comes to numerical variables. Leading zeros in the string variable will vanish when "put that into a numerical".

Try to formulate your question/problem in other words.

Answer 1

[Rik]

num2str, fprintf and sprintf all have options to specify a format when converting a numeric value to a string.

a=num2cell(1:10);
b=cellfun(@(x) sprintf('%02d',x),a,'UniformOutput',false);

[Jan]

Or the undocumented:

b = sprintfc('%02d', a);

[Rik]

Cool, that's even 20 times faster. Not strange, as you remove a lot of overhead.