How to generate string without space at the beginning?

FieldsLetter = repmat('Item_',16,1);
FieldsDigit = num2str(transpose(2:2:16),'%1d');
Fields = strcat(FieldsLetter, FieldsDigit);

The result from above code is Fields =

Item_ 2

Item_ 4

Item_ 6

Item_ 8

Item_10

Item_12

Item_14

Item_16

But what I want is Fields =

Item_2

Item_4

Item_6

Item_8

Item_10

Item_12

Item_14

Item_16

So how to generate string by using num2str without the space at the beginning? Thank you.

Answer 1

[Kelly Kearney]

Easier, you can just add the string part to the num2str format:

Fields = num2str((2:2:16)', 'Item_%d');

Of course, this right-justifies the final results, which may or may not matter to you. If you're looking to get a cell array of strings eventually, you can quickly trim the extra whitespace:

Fields = strtrim(cellstr(num2str((2:2:16)', 'Item_%d')))

Answer 2

[Star Strider]

Change '%1d' to '%-1d'. The ‘-’ in front of the format descriptor left-justifies it.

FieldsLetter = repmat('Item_',8,1);
FieldsDigit = num2str(transpose(2:2:16),'%-1d');
Fields = strcat(FieldsLetter, FieldsDigit);

Answer 3

[per isakson]

num2str creates a rectangular character array. The "extra" space can be moved to the end of the string. If that's ok

Replace

    FieldsDigit = num2str(transpose(2:2:16),'%1d');

by

    FieldsDigit = num2str(transpose(2:2:16),'%-2d');

And read the documentation on num2str. Note:

    '–'   Left-justify. Example: %-5.2f

An alternative is to insert a leading zero

    FieldsDigit = num2str(transpose(2:2:16),'%02d');