@rmacarthur wrote:
Thank you very much, the code works properly now, which is great !.
What I still do not understand is this line :
%do time=&start %to &end %by &incr;
Is time a temporary variable of some kind?
It does not appear in the PROC SGPlot procedure, or in the source dataset. But it controls how many images are produced by the PROC SGPlot procedure, for the .GIF file.
Thanks again!
TIME is a MACRO VARIABLE.
In this code it is use as the iterator variable for the macro %DO loop.
Inside the %DO loop it is used to generate part of this SAS statement:
where t_days le &time/&divisor;
So when TIME has the value 1250 and DIVISOR has the value 1000 the following SAS statement is generated and run.
where t_days le 1250/1000;
You should modify the definition of the macro %SERIES() to define TIME as a LOCAL macro variable. That will prevent the %SERIES() macro from modify any existing macro variable named TIME that might be used by the program that is calling %SERIES().
%macro Series(start=, end=, incr=,divisor=1);
%local time;
%do time=&start %to &end %by &incr;
proc sgplot data = Sample_2_con;
where t_days le &time/&divisor;
title "C vs T";
/* each image has two time series */
series x = t_days y = Cp_tot;
series x = t_days y = Cp_tot_2;
/* set common axes */
xaxis integer values = (0 to 7);
yaxis min = 0 max = 120 grid;
run;
%end;
%mend Series;
Note that the parameters of the %SERIES() macro [ START, END, INCR and DIVISOR ] are all LOCAL macro variables also.
