Question

How to use expm1() function to get the exp (2.7182818) raised to the power N - 1 in PHP

Answer 1

echo "expm1(-1) = " . expm1(-1) . "<br />";
echo "expm1(1) = " . expm1(1) . "<br />";
echo "expm1(0) = " . expm1(0) . "<br />";
echo "expm1(-0) = " . expm1(-0) . "<br />";
echo "expm1(5) = " . expm1(5) . "<br />";
echo "expm1(0.5) = " . expm1(0.5) . "<br />";
echo "expm1(100) = " . expm1(100) . "<br />";
echo "expm1(710) = " . expm1(710) . "<br />";

/*
run: 

expm1(-1) = -0.63212055882856
expm1(1) = 1.718281828459
expm1(0) = 0
expm1(-0) = 0
expm1(5) = 147.41315910258
expm1(0.5) = 0.64872127070013
expm1(100) = 2.6881171418161E+43
expm1(710) = INF

*/

 

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