Teacher2Teacher 
Q&A #7118 
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From: irvpost <irvpost@excite.com> To: Teacher2Teacher Public Discussion Date: 2007112018:18:30 Subject: Re: Re: what is an array? I do not tink any of the eamples are very good. They leave to much grey area. DEF The simplest term is a set of blocks that can contain data. They are usually defined by row and column. Think of a childs blocks stacked 2 high and three wide. This would be a 2x3 array. Sometimes refered to as a Matrix. Imagine a Sudoku puzzle. It consists of multiple arrays and 1 large array. You have 9 3x3 arrays, 9 1x9 arrays, 9 9x1 arrays, and 1 9x9 array, The reason these are considered arrays are because they function together. As we get more complex the array can become 3 dimensional. but I feel this is beyond the scope of this example. In computer science we have a similar but different view of arrays. DEF An array is a data structure consisting of a group of elements that are accessed by indexing. The main ingrediant of an arrya is an index to hold everything together. Imagine a 25x5 array. 25 rows and 5 columns. let the first column be last names, the 2nd being first name, 3rd being age, 4th would be favorite color and the 5th their home phone number. in order to be able to sort the data without possibly changing Sherrys favorite color from Red to Blue and giving her Tera's phone number is to have an index. The index in an array keeps everything from getting moved around. Excel is a perfect axample of arrays. Almost everything you put in exel becomes and array.
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