Error Diagnostics

The VML mathematical functions incorporate the error handling mechanism, which is controlled by the following service functions:

 
vmlGetErrStatus, vmlSetErrStatus, vmlClearErrStatus

These functions operate with a global variable called VML Error Status. The VML Error Status flags an error, a warning, or a successful execution of a VML function.

vmlGetErrCallBack, vmlSetErrCallBack, vmlClearErrCallBack

These functions enable you to customize the error handling. For example, you can identify a particular argument in a vector where an error occurred or that caused a warning.

vmlSetMode, vmlGetMode

These functions get and set a VML mode. If you set a new VML mode using the vmlSetMode function, you can store the previous VML mode returned by the routine and restore it at any point of your application.

If both an error and a warning situation occur during the function call, the VML Error Status variable keeps only the value of the error code. See Table "Values of the VML Error Status" for possible values. If a VML function does not encounter errors or warnings, it sets the VML Error Status to VML_STATUS_OK.

If you use the Fortran interface, call the error reporting function XERBLA to receive information about correctness of input arguments (VML_STATUS_BADSIZE and VML_STATUS_BADMEM). See Table "Values of the VML Error Status" for details.

You can use the vmlSetMode and vmlGetMode functions to modify error handling behavoir. Depending on the VML mode, the error handling behavior includes the following operations:

Set Values of the errno Variable
Value of errno Description
0 No errors are detected.
EINVAL The array dimension is not positive.
EACCES NULL pointer is passed.
EDOM At least one of array values is out of a range of definition.
ERANGE At least one of array values caused a singularity, overflow or underflow.

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