topic unable to understand output values of variables in SAS Programming

unable to understand output values of variables

Darpnew — Thu, 02 Jul 2015 11:01:49 GMT

Dear SAS users,

Could you please help me understand output of below program?

data work.passengers1;

if origpassengers = . then origpassengers =100;

transpassengers = 100;

origpassengers = totlapassengers = sum( origpassengers, transpassengers) + 0 ;

run;

proc print data = work.passengers1;

title 'check-1';

run;

output is:

origpassengers =0

transpassengers =100

totlapassengers = .

What i understand is that when pdv initialize all variables to missing, then we get first condition tset to true, hence origpassenger =100, then transpas is set to 100, but then how come value of totalpass is coming out to be missing (.) and why origpass has been set to 0.

Appreciate your help as always

Re: unable to understand output values of variables

Darpnew — Thu, 02 Jul 2015 11:08:06 GMT

again, i just realised that totalpass value should also have been 200 instead of 100. Please explain with bit detail.

Re: unable to understand output values of variables

Steelers_In_DC — Thu, 02 Jul 2015 11:46:59 GMT

I don't understand what you are trying to do here but this is where your problem is:

origpassengers = totlapassengers = sum( origpassengers, transpassengers) + 0 ;

If you give an example of data and your desired solution I can help more.

data step1;

infile cards;

input orig ;

cards;

500

160

;

run;

data passengers1;

set step1;

if orig = . then orig =100;

trans = 100;

total = sum( orig, trans);

run;

If you are adding the original in hopes to sum that's different, let me if this helps.

data passengers2;

set step1;

if orig = . then orig =100;

trans = 100;

total = sum(orig,trans);

sum + total;

run;

Re: unable to understand output values of variables

Darpnew — Thu, 02 Jul 2015 13:53:07 GMT

It is a problem i came through while preparing for base sas certification, so I am not bringing this problem from any practicle reference / problem. But, I concede that there is some important concept which I am missing and I need to understand that.