In high school, the tutor had a calculator much like the TI-30XA. For scientific notation, there’s probably none better. What some people call the “normal” way to write a number, is also known as “float”. So 1.35×10-3 is 0.00135 in …

Scientific notation: toggling back and forth on the TI-30XA Read more »

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A lifetime ago, the tutor studied financial planning.  That’s when he got acquainted with the HP-10B. Of the financial calculators I know, the Hewlett-Packard HP-10B is potentially the easiest to use. One feature of particular value to anyone in financial …

Financial math: interest rate conversions on the HP-10B Read more »

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The tutor returns to the perl sort function. Back in my post on November 27 I introduced a perl program that finds the median of a list of numbers. It depends on perl’s built-in sort function to put the numbers …

Perl: alphabetizing a list of command line arguments Read more »

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