53 lines
1.3 KiB
ReStructuredText
53 lines
1.3 KiB
ReStructuredText
==============
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Special values
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==============
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NA values
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=========
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All OBITypes have an associated NA (Not Available) value.
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NA values are implemented by specifying an explicit NA value for each type, corresponding to the R standards:
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* For the types ``OBIInt_t``, ``OBIBool_t``, ``OBIIdx_t`` and ``OBITaxid_t``, the NA value is ``INT_MIN``.
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* For the type ``OBIChar_t``: the NA value is ``\0`` (?).
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* For the type ``OBIStr_t`` : the NA value is ``\0`` (?).
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* For the type ``OBIFloat_t``::
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typedef union
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{
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double value;
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unsigned int word[2];
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} ieee_double;
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static double NA_value(void)
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{
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volatile ieee_double x;
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x.word[hw] = 0x7ff00000;
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x.word[lw] = 1954;
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return x.value;
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}
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Minimum and maximum values for ``OBIInt_t``
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===========================================
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* Maximum value : ``INT_MAX``
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* Minimum value : ``INT_MIN(-1?)``
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Infinity values for the type ``OBIFloat_t``
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===========================================
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* Positive infinity : ``INFINITY`` (should be defined in ``<math.h>``)
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* Negative infinity : ``-INFINITY``
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NaN value for the type ``OBIFloat_t``
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=====================================
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* NaN (Not a Number) value : ``NAN`` (should be defined in ``<math.h>`` but probably needs to be tested)
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