XPATH math:exp

exp

Signature

 xsd:double  EXP (numeric)

The result is the mathematical constant e raised to the power of $arg, as defined in the [IEEE 754-2008] specification of the exp function applied to 64-bit binary floating point values.

This function is the same as math:exp.

ASK {FILTER(EXP(1.0) >= "2.718281828459045"^^xsd:double)}
ASK {FILTER(EXP(1.0) <= "2.718281828459046"^^xsd:double)}
ASK {FILTER(EXP(0) = "1.0e0"^^xsd:double)}
ASK {FILTER(EXP(2.0) = "7.38905609893065e0"^^xsd:double)}
ASK {FILTER(EXP(2) = "7.38905609893065e0"^^xsd:double)}
ASK {FILTER(EXP(-1) = "0.36787944117144233e0"^^xsd:double)}
ASK {FILTER(EXP(PI()) = "23.140692632779267e0"^^xsd:double)}

Should return true

exp() called without a variable/value should be a parse error.

exp() cast with a numeric should have an attempted cast to the xsd:double.

Note that EXP has an approximate answer for common test values e.g. the 1.0