How do I input a variable that contains a previous variable?

The input for my function requires a letter "d" after a variable that I calculate, as shown below. I can't get it to work because I don't know the syntax for the code.

function [S0,S1,S2,S3] = calcStokes(n)
full_name = fullfile('I0R', n);
full_name2 = full_named;
I0value = I0(full_name2,full_name);
disp(I0value)

Above is the code that requires 2 inputs, one with the a name "n" and one with a name "nd"

Answer 1

[Walter Roberson]

full_name = fullfile('I0R', sprintf('%d', n));
full_name2 = [full_name 'd'];

But considering your other postings I suggest you are probably looking for something more like

base = sprintf('%d',n);
full_name = fullfile('IOR', [base '.bmp']);
full_name2 = fullfile('IOR', [base 'd.bmp']);

[Sulaiman Alvi]

Thanks, you are awesome.

Answer 2

[Azzi Abdelmalek]

Define nd as peristent variable. Look at this example

function y=myfcn(n)
persistent nd
if isempty(nd)
  nd=0
end
y=2*n+nd
nd=n

[Sulaiman Alvi]

I'm sorry, I didn't explain myself properly. I want to be able to input 0 as n, and load in two files from the folder: 0 and 0d. This means that 0d is an actual file name.

[Azzi Abdelmalek]

This is not clear

[Sulaiman Alvi]

Edited for clarity.