Tim’s Blog
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Presentation on Linear Algebra in R
At our January meeting, I presented on Linear Algebra basics in R. I have been taking the Andrew Ng’s Stanford Machine Learning course. That course primarily uses Matlab (or Octave, and open source equivalent), and machine learning involves manipulating and calculating with matrices. Naturally, being an R person, I have been working with some of…
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Mapping Functions in R
I have been buffing up on some areas of Math that I felt rusty in. One of the tools I was using was my old TI-82 calculator I used in high school. I even got the TI Connect software working where I could download screenshots, etc. You can put in data sets (see screen cap…
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Removing Exif Data To Resolve IOS Issues
Related to my last post, I had a bug to fix. The images looked rotate 90 degrees locally, so I used Imagemagick’s convert command to rotate them 90 degrees. They looked right locally, and on the sight when viewed in chrome. However, iOS was showing the images over-rotated by 90 degrees. It turns out after…
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Resizing Images in Bulk
I help maintain a site for a craft business. One of the challenges is multiple sizes of images for new stock each year. I used to go through and resize each image manually with a program like Gimp. I finally got smart and installed ImageMagick. With a Rakefile, I can pass each image into the…
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Data-Driven vs the Dashboard
It is common for technical product companies to call themselves “data-driven” these days. The idea is that metrics are used to drive decisions. Sounds easy enough, and compatible with a technology landscape that is enamored with data science, etc. But something didn’t always feel right to me. Strange, right? If you follow this blog or…
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