posts ⨳ rkoopmann

Here’s some things I’ve written over the years; Some are good, some are okay, a lot are stupid.

2026

Jan 05 — caledger: calendar + ledger-cli ⨳ bash ⨳ ledger-cli ⨳

2024

Jun 16 — Thoughts from an Apple Vision Pro demo ⨳ Apple Vision Pro ⨳

Jun 04 — Text Player ⨳ SwiftUI ⨳ app ⨳ iOS ⨳ iPad ⨳

Apr 26 — Some Jekyll Tools ⨳ bash ⨳ json ⨳ meta ⨳

Mar 12 — (In|De)flation ⨳ SwiftUI ⨳ api ⨳ app ⨳ iOS ⨳ iPad ⨳

2023

Jan 02 — New (To Me) Music - 2022 ⨳ music ⨳

2022

Nov 05 — A Simple Card Trick ⨳ SwiftUI ⨳ app ⨳ iOS ⨳

Apr 08 — Text Permutations on iOS/macOS ⨳ SwiftUI ⨳ app ⨳ iOS ⨳ iPad ⨳ macOS ⨳ sas ⨳

2020

Jul 20 — A Function to Mask Strings ⨳ function ⨳ sql ⨳

Apr 07 — Setlist Events in Go ⨳ golang ⨳

2017

Aug 01 — Wallets ⨳ review ⨳

Jul 18 — Shifty Metadata ⨳ Excel ⨳ function ⨳ sas ⨳

2015

Mar 01 — Simplenote to Vesper ⨳ app ⨳

2014

Oct 29 — Current File Path ⨳ sas ⨳ snippet ⨳

Aug 26 — Finding Conventions, Establishing Standards ⨳ perl ⨳ sas ⨳

Aug 22 — We Blew It ⨳ rant ⨳ twitter ⨳

Aug 18 — getOption ⨳ sas ⨳ sas macro ⨳ system options ⨳

Jul 17 — Benchmarking the sasload Statement ⨳ benchmark ⨳ sas ⨳

Jul 14 — On Interruptions ⨳ analysis ⨳

Jul 09 — Rebuilding Wide Macros ⨳ sas ⨳ sas macro ⨳

May 19 — Last Week of Quarter ⨳ date values ⨳ sas ⨳

May 03 — Setting %array Values Through %do_over ⨳ sas ⨳ sas macro ⨳

Jan 28 — $329 Retina iPad Mini ⨳ iPad ⨳

2013

Dec 29 — A New Home ⨳ meta ⨳

Dec 26 — transactions.pl: A Mint Parser ⨳ gist ⨳ perl ⨳

Apr 30 — Convert to a [hhmmss-Type Integer to a] SAS Time - (SO) ⨳ sas ⨳ stack overflow ⨳ time values ⨳

Apr 01 — Pretty Note Blocks ⨳ sas ⨳ sas macro ⨳

Mar 29 — Setting the Price Early ⨳ apple ⨳ iPad ⨳

Feb 23 — In the Future, I'll Only Buy Memorex Optical Media ⨳ tip ⨳

Feb 01 — Writing Fractions in html ⨳ html ⨳ sas ⨳

2012

Nov 26 — SAS Global Forum 2013 ⨳ conference ⨳ sas ⨳ sas macro ⨳

Oct 30 — Blocks, Not Lines ⨳ debug ⨳ sas ⨳ sas macro ⨳

Oct 28 — Dates From Datetimes ⨳ date values ⨳ function ⨳ sas ⨳ technical debt ⨳

Oct 05 — Too Complex to Edit ⨳ meta ⨳ rant ⨳

Sep 25 — Classical SAS ⨳ music ⨳ sas ⨳

Sep 22 — The Non-Letterboxed Keyboard ⨳ iOS ⨳ rant ⨳

Sep 17 — resolve Function ⨳ function ⨳ sas ⨳

Sep 12 — The Paywall, the Backdoor, and Twitter ⨳ hack ⨳

Aug 02 — Western Users of SAS Software 2012 ⨳ conference ⨳ sas ⨳ sas macro ⨳ tracker ⨳

May 18 — Why I Look Forward to Collection Calls ⨳ rant ⨳

May 10 — Windows Environment Variables ⨳ sas ⨳ windows ⨳

Apr 26 — My SAS Global Forum 2012 Timeline ⨳ conference ⨳ sas ⨳

Apr 06 — Self-Purging Macros? ⨳ sas ⨳ sas macro ⨳

Apr 02 — Simulating Child's Play ⨳ array ⨳ do loop ⨳ sas ⨳ simulation ⨳

Mar 29 — Getting Feedback on Macro Parameters ⨳ sas ⨳ sas macro ⨳ tip ⨳

Mar 14 — Macros and the DATA Step ⨳ data step ⨳ sas ⨳ sas macro ⨳

Feb 27 — Clearing Out the Cruft ⨳ apple ⨳

Feb 19 — API Upgrades ⨳ api ⨳ sas ⨳

Jan 24 — A Small Portion of a Large Number… ⨳ rant ⨳

Jan 23 — Vending Machine Math ⨳ array ⨳ sas ⨳

Jan 20 — My k'nex iPhone Stand ⨳ diy ⨳ iOS ⨳

Jan 05 — The Positive Side of Keeping All Your Eggs in One Basket ⨳ sas ⨳ tip ⨳

2011

Dec 11 — Tweetbot ⨳ iOS ⨳

Dec 04 — Free App Idea ⨳ iOS ⨳

Oct 12 — Western Users of SAS Software 2011 ⨳ api ⨳ conference ⨳ sas ⨳ sas macro ⨳

Sep 22 — Dates in Datetime Fields ⨳ date values ⨳ sas ⨳

Sep 14 — Continue-Looping ⨳ do loop ⨳ sas ⨳

Sep 06 — Returning a Well-Formatted Date-Time ⨳ bash ⨳ date ⨳ macOS ⨳

Apr 25 — The vvalue Function--Like a Quick PUT Function ⨳ sas ⨳ tip ⨳

Mar 07 — Label Carryover ⨳ sas ⨳ tip ⨳

Feb 08 — Month of Quarter Variable ⨳ date values ⨳ format ⨳ sas ⨳

Jan 26 — How Do I Read a File's Creation Date? ⨳ file system ⨳ sas ⨳

2010

Feb 15 — The Vertical App Listing ⨳ iOS ⨳

Feb 04 — prxparse(dates) ⨳ date values ⨳ quatch ⨳ regex ⨳ sas ⨳

2009

Nov 09 — The Utility of Generic Macros ⨳ quatch ⨳ sas ⨳ sas macro ⨳

Oct 20 — An mmddyyyy hhmmss Informat. Kinda. ⨳ date values ⨳ informats ⨳ quatch ⨳ sas ⨳

Jul 15 — Random Dates ⨳ date values ⨳ do loop ⨳ quatch ⨳ sas ⨳

Jul 10 — Calculating Average Time (Duration) ⨳ datetime values ⨳ quatch ⨳ sas ⨳

Jul 08 — %d: A Handy Little Macro For Dynamic Dating ⨳ date values ⨳ function ⨳ quatch ⨳ sas ⨳ sas macro ⨳

Jun 01 — Encoding Data Points for Use With Google Charts API Calls ⨳ api ⨳ data visualization ⨳ quatch ⨳ sas ⨳

May 19 — Reading Overlapping Text Segments ⨳ quatch ⨳ sas ⨳ web scraping ⨳

May 11 — Reading Non-Standard Datetime Values ⨳ datetime values ⨳ quatch ⨳ sas ⨳

May 06 — Reading ISO Dates and Datetimes ⨳ date values ⨳ datetime values ⨳ quatch ⨳ sas ⨳

Apr 28 — Frustrations With Dashboarding in SAS 9.1.3 ⨳ dashboard ⨳ quatch ⨳ sas ⨳

Apr 23 — A Sudden Spike ⨳ meta ⨳ quatch ⨳

Mar 22 — SAS Global Forum 2009 ⨳ conference ⨳ sas ⨳ sas macro ⨳

Feb 25 — %expExcel ⨳ Excel ⨳ quatch ⨳ sas ⨳ sas macro ⨳

Jan 25 — SAS Variable Lists ⨳ quatch ⨳ tip ⨳

Jan 14 — Scraping the SAS Training Pages ⨳ quatch ⨳ regex ⨳ web scraping ⨳

2008

Dec 07 — PROC PWDECODE ⨳ hack ⨳ sas ⨳

Sep 14 — SAS on an iPhone ⨳ iOS ⨳ quatch ⨳ sas ⨳

Aug 06 — The Missing Format: QYY ⨳ format ⨳ quatch ⨳ sas ⨳

Jun 19 — Introducing meandfreq ⨳ quatch ⨳ sas ⨳ sas macro ⨳

Jun 18 — Wiping USB Drives ⨳ quatch ⨳ sas ⨳ tip ⨳

Mar 16 — SAS Global Forum 2008 ⨳ conference ⨳ sas ⨳ sas macro ⨳

Jan 24 — Autosave My Day ⨳ quatch ⨳ sas ⨳ tip ⨳

Jan 16 — The Ugly Truth About Call Execute ⨳ quatch ⨳ sas ⨳ sas macro ⨳

2007

Dec 22 — Let That Be a Lesson to 'Ya! ⨳ quatch ⨳ sas ⨳ tip ⨳

Dec 21 — Converting YYYYMMDD-Type Integer to SAS Date Values ⨳ date values ⨳ quatch ⨳ sas ⨳

Nov 14 — SAS, SVN, and Google Code ⨳ quatch ⨳ sas ⨳

Nov 09 — What's the Point of This? ⨳ array ⨳ do loop ⨳ quatch ⨳ rant ⨳ sas ⨳

Nov 08 — iTunes XML Parser ⨳ quatch ⨳ sas ⨳ xml ⨳

Oct 07 — SAShboards = Dashboards in SAS? ⨳ dashboard ⨳ quatch ⨳ sas ⨳ tutorial ⨳

Oct 06 — Calculating Period-to-Period Changes in SAS ⨳ date values ⨳ quatch ⨳ sas ⨳

Oct 05 — Comp'd at the Palace ⨳ conference ⨳ quatch ⨳ sas ⨳ travel ⨳

Oct 04 — What was quatch? ⨳ quatch ⨳

Sep 17 — Pacific Northwest SAS Users Group 2007 ⨳ conference ⨳ sas ⨳ sas macro ⨳

Sep 14 — ZipsNear ⨳ sampling ⨳ sas ⨳ sas macro ⨳

2006

Mar 26 — SAS User Group International 31 ⨳ conference ⨳ sas ⨳

2005

May 01 — Using the ACT to Predict College Graduation ⨳ research ⨳ statistics ⨳

2002

Oct 01 — Science, Technology, & Engineering Preview Summer 2002 ⨳ research ⨳

Sep 01 — UW-Stout Journal of Student Research Volume 2 ⨳ research ⨳

Apr 26 — UW-Stout Research Day ⨳ research ⨳

Apr 01 — UW-Stout Journal of Student Research Volume 1 ⨳ research ⨳

2000

Dec 01 — The Relationship Between Job Satisfaction and Job Performance ⨳ research ⨳