How to check your calculus integrals on a TI-84 Handheld Calculator

Integration is often a fairly arduous maths exercise, and we are prone to making silly algebra errors when doing them. Wouldn’t it be nice if we had an easy way of checking our solutions? Checking integrals, especially indefinite integrals, is not always a straightforward thing to do on a handheld calculator. Fortunately, there are some […]

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Magento: Add attribute columns in ‘Manage Products’ grid

Magento does not provide us with the ability to choose which attributes are included as columns in the Manage Products grid but it’s fairly simple to make the necessary code changes. The code that generates the Manage Products grid is at /app/code/core/Mage/Adminhtml/Block/Catalog/Product/Grid.php. The first thing you need to do is copy Grid.php into to the […]

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Magento: Programmatically Updating SKUs in Bulk

Magento does not make it easy to change SKUs in bulk. Try to do it via the import/export or dataflow profiles and you run into all kinds of problems. There is, however, a fairly easy way to do it and it simply involves adding a php script to your server and a CSV file of […]

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Posted in Web Development | Tagged as: , , | 27 Comments

Dell Inspiron 1545, Time of Day Clock Stopped Error, Replacing Clock Battery

Recently a friend’s laptop stopped working. The screen would go black and display only the message; “Time-of-day clock stopped”. The error occurred before the start-up sequence reached the boot options. After some research I discovered that it’s actually a common problem for the Dell Inspiron. I also learned that a little coin cell battery needs […]

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Posted in Other Stuff | Tagged as: , , | 15 Comments

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