How to change directory name automaticly

[Moh]

hi folks - 

I have got the following directory and need to be changed automatically once I change the years.

%let dir2=M:\Lib\T9099H0103Y\T9099H0103Y_CO;

libname coeficents "&dir2"

%let DT=90;

%let UT=99;

%let DH=01;

%let UH=03;

To be clearer, I want by changing DT, UT,DH and UH  the directory path changes. thanks 

[Reeza]

I'm not following, please explain your problem further.

[Moh]

 For example I have got this dir path;

%let dir2=M:\Lib\T9099H0103Y;

libname coeficents "&dir2"

Now i want to change the path according to the following items

%let DT=91;

%let UT=97;

%let DH=02;

%let UH=05;

to have this new directory at the end;

%let dir2=M:\Lib\T9197H0205Y;

[Reeza]

I don't understand still...I guess you could use a macro.But how did the mapping occur? How do you know to switch from

Is it something like:

%let dir2= M:\Lib\&DT.&UT.H&DH.&UH.Y;

libname coeficents "&dir2"

[Moh]

Your question is not clear. I have the results of about 100 types of models which are developed using different training samples and will be tested on different holdout samples. So I need to arrange them in different folders and name the folders based on training sample (e.g. T9199 ) which mean 1991 to 1999 and holdout sample (e.g. H0105) which means 2001 to 2005. 

However, your answer helped me a lot. thanks 

[Reeza]

A libname can only be 8 characters, your current name is too long.

You don't need two macro variables as well, can use one directly.

%let DT=90;

%let UT=99;

%let DH=01;

%let UH=03;

libname mylib  "M:\Lib\T&DT.&UT.H&DH.&UH.Y;";

[Astounding · Accepted solution]

You will need to move the %LET statements so that they come before the directory path:

%let DT=90;

%let UT=99;

%let DH=01;

%let UH=03;

%let dir2=M:\Lib\T&DT.&UT.H&DH.&UH.Y_CO;

libname coeficents "&dir2";

It's not clear from your post whether these are the exact changes to make to the directory path, but this gives you the technique to apply.

Good luck.

[Moh]

It's not working !!!!

[Astounding]

This is a short enough program that you should be able to post your program and the log from it.

[Reeza]

That's too bad....but we have no idea what that means. 

[ballardw]

Did you change the LIBNAME to 8 characters?