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  1. darklich14

    Inverse trigonometric ratios (arcsin, arccos, arctan, etc.)

    I am calculating the distance in nautical miles between two lat and lon coordinates on the globe. The formula calls for the arccos of a bunch of things and I am unable to find an arccos function in the math library. Does anyone know of a way around this or if there is an arccos function but I'm...
  2. darklich14

    I have to put separators in strings from right to left

    I have an array of values such as aug2300.htm I need to add separators from right to left because from left to right, the month portion of the string could be 3 or 4 characters (aug, sept). The steps of the operation would be: 1: aug23.00.htm 2: aug.23.00.htm Note how they are added...
  3. darklich14

    Need to manipulate an array in php

    I have an array of filenames, but now I need to figure out someway how to get the files which are not .gif or .htm to be taken out of the array. the source is at http://www.roswellhigh.com/announcements/test/dirlist.phps and the actual output of the source at...

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