Setting Parameters To Subtract from other Parameters

[ccaudillo100]

Hello,  I am trying to see if there is a way to set Parameters based off of other Parameters. 

Currently I use:

%Let RY=23;

I would like to set 

%Let RY1 =22;

%Let RY2 =21;

etc. for 10 more years. 

but instead of manually changing every single one of them at the start of a new year, I was wanting to see if I could set it to be something like

%Let RY=23;

%Let RY1 = RY-1; so when it plugs in RY1 it will place 22.

Thanks in advanced!

[ballardw]

If you show more of what you are attempting it may help.

I would suggest that if the values you want are in sequence to use a macro with a loop.

%macro somename (start=, end=);
% do Ry=&start %to &end;

<other code- suffix final output if needed with value of &ry to distinguish>

%end;
%mend;

%somename (start=21, end=31)

You can use %eval function to force INTEGER arithmetic with macro values %let var = %eval(&othervar - 1); If the values are decimals the use %sysevalf.

[PaigeMiller · Accepted solution]

%let ry1=%eval(&ry-1);

However, as alluded to by @ballardw , it may be a better idea to discuss the context on how this will be used, as perhaps we can provide even better solutions if we know the broader context.