SAS subtraction

[robertrao]

Hello, 

I have columns in Excel which have blank values. After importing to SAS they all now have a dot as shown below in the "have "dataset. Now the requirement is to subtract all these variables from 4 as shown. After performing the calculation to my surprise i still have missing values instead of 4. Did i miss anything?

data have

PAL1 PAL2 PAL3 PAL4

  .           .     .         .

run;

data Want;

set have;

paL1_=4-pal1;

pal2_=4-pal2;

pal3_=4-Pal3;

pal4_=4-pal4;

run;

Thank you

[Kurt_Bremser]

Simple calculations involving missing values will result in missing values; the log (Maxim 2) alerts you to that.

The sum() function will count missing values as zero, so you can use it here:

data have;
input pal1-pal4;
cards;
. . . .
;
run;

data want;
set have;
pal1_ = sum(4,-pal1);
pal2_ = sum(4,-pal2);
pal3_ = sum(4,-pal3);
pal4_ = sum(4,-pal4);
run;

proc print data=want noobs;
run;

Result:

pal1    pal2    pal3    pal4    pal1_    pal2_    pal3_    pal4_

  .       .       .       .       4        4        4        4