Archive for November, 2007

Controlling what the wpgm command calls in Windows SAS

November 30, 2007 No comments

I was setting up a key mapping in SAS 8.1 such that the log and output windows are cleared and a SAS program run in the most recently used program editor window. The idea was that debugging would be easier and command was what you see below:

log; clear; output; clear; wpgm; submit

I was having trouble getting SAS to pick up the most recently used Enhanced Editor window and it was opening up an old style Program Editor window in its place. If I had wanted to use that, I would have used pgm and not wpgm. What was conspiring against me was a pesky system option. Pottering over to Tools > Options > Preferences and navigating to the Edit tab brought me to the cause of the problem: the Use Enhanced Editor check box was in the clear and fixing that set me on my way. SAS 9 could also be afflicted by the same irritation and that is where i got the screenshot that you see below where everything is hunky dory.

SAS 9 Edit Preferences

Programming, Software, Windows

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Correcting or updating blog posts

November 29, 2007 No comments

I have grown to notice that certain bloggers are not removing old content from a blog but merely striking it through using something like CSS. There is a place for this but it does strike me as overkill sometimes and can look untidy. Sometimes, that lack of neatness is a trade-off since the highlighting of a correction itself conveys a message. I have been know to tweak posts immediately after publishing without leaving the previous content on view but my changes generally are readability improvements more than anything else. Typos and spelling mistakes also get corrected like this; nobody needs them highlighted for all to see. I am not trying to fool anyone and, if I want to update the content, I either add another post or use another tactic that I have seen others use: updates at the bottom of the post that are denoted as such. It’s another transparent approach that preserves the authenticity of the piece.

Web 2.0, Web Tools

Append or update?

November 25, 2007 No comments

SAS can generate many types of output: plain text, XML, PDF, RTF, Excel, etc. With all of these and the SAS procedures like PROC REPORT, PROC TABULATE and so on, it might seem surprising for me to say that I have been generating output with data step PUT and FILE statements. There was, of course, a reason for this: creating text files for loading into a new database-driven software application. At one stage, I also did some data interleaving at the output stage and that’s when I discovered that the default behaviour for SAS FILE statements is to completely overwrite a file unless the MOD option was specified. Adding that switches on APPEND behaviour. The code below adds a header in one step while adding data below it in another. I know that there are slicker ways to achieve this like setting up your data as you want it or using _N_ to ensure that something only appears once but here’s another way. As per the Perl, there’s often more than one way to do something with SAS.

DATA _NULL_;
 FILE DS_DATA;
 PUT "FIELDTYPE;DATASETNAME;DATASETLABEL;DATASETLAYOUT;DATASETCLASS;DATASETSTANDARDVERSION";
RUN;

DATA _NULL_;
 SET DS_ISPEC;
 FILE DS_DATA MOD;
 LINE="DATASETSTANDARD;"||TRIM(MEMNAME)||";"||TRIM(MEMLABEL)||";;;"||TRIM(MEMVER);
 PUT LINE;
RUN;

Programming

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The irritation of a 4 GB file size limitation

November 20, 2007 No comments

I recently got myself a 500GB Western Digital My Book, an external hard drive in other words. Bizarrely, the thing is formatted using the FAT32 file system. I appreciate that backward compatibility for Windows 9x might seem desirable but using NTFS would be more understandable, particularly given that the last of the 9x line, Windows ME, is now eight years old (there cannot be anybody who still uses that, can there?). The result is that I got core dump messages from cp commands issued from the terminal on my Ubuntu system to copy files of size in excess of 4GB last night. It surprised me at first but it now seems to be a FAT32 limitation. The idea of formatting the drive as NTFS did occur to me but GParted would not do that, at least not with my current configuration. The ext3 file system is an option but I have a spare PC with Windows 2000 so that will be a step too far for now, unless I take the plunge and bring that into the Linux universe too.

Other than the 4GB irritation, the new drive works well and was picked up and supported by Ubuntu without any hassle beyond getting it out of the box, finding a place for it on my desk and plugging in a few cables. While needing judiciousness about file sizes, it played an important role while I converted a 320 GB internal WD drive from NTFS to ext3 and may yet be vital if my Windows 2000 box gets a migration to Linux. In interim, 500 GB is a lot of space and having an external drive that size is a bonus these days. That is especially the case when you consider that the 1 terabyte threshold is on the verge of getting crossed. It certainly makes DVD’s, flash drives and other multi-gigabyte media less impressive than they otherwise might appear.

Hardware, Linux, Operating Systems, Windows

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Do I still need serial numbers?

November 19, 2007 No comments

My spot of bad luck with Windows in August highlighted the importance of hanging on to serial numbers for software that I had purchased over the internet and downloaded. I could at the ones that I needed but they were retained in a motley mix of text files and emails; one even was rediscovered by pottering back to the website of the purveyor. The security of the installation files themselves was another matter of some concern but I was rather more organised in that regard. Both of these are things that need checking before Windows falls to pieces on you and needs to be reinstalled. Of course, human nature being what it is means that we often end up picking up the pieces after a calamity has struck when a spot of planning would have made things that bit easier.

Linux does make life easier on this front: commercial applications are anything but the dominant force that they are in the world of Windows. That means that serial numbers are few and far between and I only need the one for VMware Workstation. The mention of VMware brings me to my retention of Windows so knowing where serial numbers are located remains a good idea. Even so, I cloned my Windows VM so that any Windows restoration following a destructive crash should be a quicker affair. Now that I am a Linux user, Windows crashes should not encroach as much on my home computing any more and Linux should be more stable anyway…

Linux, Operating Systems, Software, Windows

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A different Firefox II: cross-platform font display issues

November 18, 2007 No comments

One of the things that I have been sorting out on this blog is how the fonts appear in Firefox running on Ubuntu. Even with the same fonts and the same browser, serif fonts were being displayed smaller and appeared more fuzzy in Linux than in Windows. And that’s even with the font sharpening that comes with turning on Ubuntu’s visual effects. So, there was a spot of swapping between Ubuntu and Windows (running on VMware) while I was increasing font sizes to make legibility better on the Linux side without things going all Blue Peter on Windows. Along the way, I added a mention of the Ubuntu font ae_AlArabiya in the CSS to further spruce up things. In my earlier web building efforts, I was having to make serif fonts bigger because of those serifs. From the on-screen legibility point of view, there’s a lot to be said for sans serif fonts and I may yet alter this blog’s theme to use them instead but I’ll ponder the idea a bit more before taking the plunge.

Linux, Operating Systems, Virtualisation, Web Development, Windows

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