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28.1.4 Deciphering error messages

The error messages are self explanatory. There are obtuse messages such as:

     WARNING cosxx1=1+0.0004 reset to 1.

These indicate that the roundoff error has accumulated to the point where a calculated cosine is greater than 1 (or less than -1), which, of course, will cause the ensuing arccosine function call to choke. As long as the value following the plus sign (or minus sign) is small w.r.t. 1 you're okay. If this number is large, it indicates a serious problem in the code, which should be brought to the developers' attention.