topic Log scale yaxis in Graphics Programming

Log scale yaxis

muyi — Tue, 26 Mar 2013 03:18:36 GMT

Hi all,

I am a new SAS user and want to present the data in log scale for y (see data and code below). But it does not work. Did I miss something? how to show minor tick marks?

Thanks

Muyi

data a;
input x y;
datalines;
0 31
2 69.4
4 78.3
6 82.4
8 51.1
10 34.1
;
run;

proc sgplot data=a;
xaxis label='x' values=(0 to 10 by 2) minor;
yaxis label='y' type=log logbase=10 ;
series x=x y=y;
run;

Re: Log scale yaxis

Jay54 — Tue, 26 Mar 2013 03:55:40 GMT

Its working in my SAS 9.3 install. Here is the graph. Note the spacing of the values on the Y axis. Default LOGSTYLE is LINEAR. You can change that to LOGEXPAND or LOGEXPONENT. Log will work as long as all the values are > 0.

Minor only works for LOGEXPAND and LOGEXPONENT, and you need more data range. Here I scaled Y by 10:

Re: Log scale yaxis

muyi — Tue, 26 Mar 2013 13:38:20 GMT

thanks Sanjay!

I have a SAS 9.2, it works when including logstyle=logexpan, but how to show the y-axis scale range (e.g. from 0.1 to 100) and how to show the minor tick in the x-axis?

thanks

muyi

Re: Log scale yaxis

muyi — Tue, 26 Mar 2013 13:49:38 GMT

OK, it works now in my SAS 9.2 but the minor tick does not show in the x-axis, any suggestion?

data a;
input x y;
datalines;
0 31
20 694
40 783
60 824
80 511
100 341
;
run;

proc sgplot data=a;
xaxis label='x' values=(0 to 100 by 20) minor;
yaxis label='y' values=(1 to 1000) type=log logbase=10 logstyle=logexpand minor;
series x=x y=y;
run;

Re: Log scale yaxis

Jay54 — Tue, 26 Mar 2013 14:28:30 GMT

Minor only works with Log (LogExpand and LogExponent) and Time axis. Minor is not supported for linear axis in 9.2 and 9.3. It will be in 9.4.

Re: Log scale yaxis

ballardw — Tue, 26 Mar 2013 14:29:53 GMT

Documentation says, at least for my 9.2.3 install, that when the VALUES option is used then MINOR is ignored. You might try the MIN and MAX to control range of values displayed.

Re: Log scale yaxis

muyi — Tue, 02 Apr 2013 21:49:48 GMT

Thanks all for the hlep. I love this community.