How to set the number of digits in a .txt file?

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I have a question about readtable command. I use readtable command in order to read a .txt file. The problem is that The column in the .txt file has 6 numbers in each row, including zero as first numer of each row (e.g. 050305, 055625, 154625, 206478 etc.)
The proble is that after the readtable command use I observe that some numbers have 5 characters, "deleting" the zero of the first character (e.g. 50305, 55625, 154625, 206478 etc.).
Could you please help me in order to have 6 characters for all the numbers (as it is in the .txt file) ?

Accepted Answer

Adam Danz
Adam Danz on 28 Dec 2022
Edited: Adam Danz on 28 Dec 2022
If you're using these values as numeric values, then you don't need the leading 0 since 056 is the same as 56.
If you're using these values as categorical values or labels then you can read them in as strings or categoricals. Or read them in as numbers and then convert them to string or categorical using:
T.Var = string(compose('%06.0f',T.Var))
% or
T.Var = categorical(compose('%06.0f',T.Var))
where T is your table and Var is the table variable name.
Adam Danz
Adam Danz on 28 Dec 2022
Edited: Adam Danz on 28 Dec 2022
You can use the T = readtable(filename,opts) syntax where opts is created by delimitedtextimportoptions. Set variableTypes to specify whether you're reading in the data as string or categorical.
It's probably easier to read the values in as numeric and then convert them using the example in my answer.

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