There are two answers, one positive and one negative. Mac users: There seems to be an increasing number of students using Mac computers, and the question is whether they are compatible with the software in our books. And if you are creating your own models (or models in any Excel add-in), there is no need to type the symbols if they appear later, just ignore them. It appears that the best practice, at least for now, is to leave these symbols alone but to ignore them. The whole issue is complex, but the following document, borrowed (with permission) from a Palisade website, provides more explanation: Dynamic Arrays and Add-In Functions.docx. Unfortunately, even though most of us don’t use dynamic arrays, the symbols can affect all of us. In short, they can, depending on the version of Excel you are using, appear next to “user-defined functions” (UDFs) in any Excel add-in.) Where did these symbols come from? Are they necessary? Should you delete them? After talking at length with a key programmer at Palisade, I learned that these symbols are Microsoft’s attempt to deal with a new feature, dynamic arrays. (They can also appear next to Palisade’s PrecisionTree functions, Palisade’s StatTools functions, and even my RandGen functions such as Normal_, discussed on my Free_downloads page.
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