HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 164
List functions, Loop functions
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hp40g+.book Page 10 Friday, December 9, 2005 1:03 AM COSH SINH TANH ALOG EXP EXPM1 LNP1 Hyperbolic cosine COSH(value) Hyperbolic sine. SINH(value) Hyperbolic tangent. TANH(value) Antilogarithm (exponential). This is more accurate than 10^x due to limitations of the power function. ALOG(value) Natural exponential. This is more accurate than ex due to limitations of the power function. EXP(value) Exponent minus 1 : ex - 1 . This is more accurate than EXP when x is close to zero. EXPM1(value) Natural log plus 1 : ln(x+1). This is more accurate than the natural logarithm function when x is close to zero. LNP1(value) List functions These functions work on list data. See "List functions" on page 19-6. Loop functions The loop functions display a result after evaluating an expression a given number of times. ITERATE Repeatedly for #times evaluates an expression in terms of variable. The value for variable is updated each time, starting with initialvalue. ITERATE(expression, variable, initialvalue, #times) Example ITERATE(X2,X,2,3) returns 256 13-10 Using mathematical functions