topic Re: How to convert a group of numeric variables into character using an array? in SAS Programming

How to convert a group of numeric variables into character using an array?

Hello_there — Wed, 08 Mar 2023 17:16:12 GMT

Hi, this is a data manipulation exercise. Could you tell me what's wrong with my code for turning numeric variables into character using the following code?

i keep getting messages about undeclared array reference

data have; 
infile datalines dsd dlm=",";
	input id $ var1 var2 var3;
datalines;
a, 34, 45, 12
b, 41, 92, 14
c, 92, 29, 11
;
run;

data have1; set have;
	array var[3] _numeric_;
		do i=1 to dim[_numeric_];
			new[i]=strip(put(var[i], best.));
		end;
run;

Re: How to convert a group of numeric variables into character using an array?

PaigeMiller — Wed, 08 Mar 2023 17:14:47 GMT

You have not declared an array named NEW. So you can't assign values to it.

Also, you declare an array named VAR. Later you refer to an array as _VAR, not the same thing. So SAS doesn't like that either.

Re: How to convert a group of numeric variables into character using an array?

Hello_there — Wed, 08 Mar 2023 17:21:21 GMT

Could i please receive some help on how to do this?
I'm hitting a brick wall because usually when i do arrays i just use the same variable name as the ones i'm changing, but bc i can't use the same variable name because i'm converting numeric to characer, i don't understand what the solution is.

edit: i changed _var to var in the OP

Re: How to convert a group of numeric variables into character using an array?

Reeza — Wed, 08 Mar 2023 17:20:14 GMT

You can't use the method you have there. How will you know what the names of the new variables will be? They cannot be the same names? So your new array needs to have the names explicitly assigned somehow.

Re: How to convert a group of numeric variables into character using an array?

Hello_there — Wed, 08 Mar 2023 17:23:30 GMT

Hi Reeza, so i guess it's not possible to do it more efficiently?

I guess it would be better just to do it
the long way
new1=strip(put(var1));
....
new3=strip(put(var3));

Re: How to convert a group of numeric variables into character using an array?

Reeza — Wed, 08 Mar 2023 17:41:37 GMT

data have; 
infile datalines dsd dlm=",";
	input id $ var1 var2 var3;
datalines;
a, 34, 45, 12
b, 41, 92, 14
c, 92, 29, 11
;
run;

data want;
set have;
array _old(*) var1-var3;
array _new(*) new_var1-new_var3;

do i=1 to dim(_old);
    _new(i) = put(_old(i), best. -l);
end;

drop i;
run;

Re: How to convert a group of numeric variables into character using an array?

Hello_there — Wed, 08 Mar 2023 17:45:04 GMT

Thanks, Reeza!

What is the purpose of " -l" in the piece of code below?

_new(i) = put(_old(i), best. -l);

Re: How to convert a group of numeric variables into character using an array?

Reeza — Wed, 08 Mar 2023 17:53:32 GMT

left alignment for the character variable to avoid weird spacing issues.

See the documentation (PUT) for the other letters/alignments.