COMMENT(!MOD!zsh/mathfunc Standard scientific functions for use in mathematical evaluations. !MOD!) cindex(functions, mathematical) cindex(mathematical functions) The tt(zsh/mathfunc) module provides standard mathematical functions for use when evaluating mathematical formulae. The syntax agrees with normal C and FORTRAN conventions, for example, example((( f = sin(0.3) ))) assigns the sine of 0.3 to the parameter f. Most functions take floating point arguments and return a floating point value. However, any necessary conversions from or to integer type will be performed automatically by the shell. Apart from tt(atan) with a second argument and the tt(abs), tt(int) and tt(float) functions, all functions behave as noted in the manual page for the corresponding C function, except that any arguments out of range for the function in question will be detected by the shell and an error reported. The following functions take a single floating point argument: tt(acos), tt(acosh), tt(asin), tt(asinh), tt(atan), tt(atanh), tt(cbrt), tt(ceil), tt(cos), tt(cosh), tt(erf), tt(erfc), tt(exp), tt(expm1), tt(fabs), tt(floor), tt(gamma), tt(j0), tt(j1), tt(lgamma), tt(log), tt(log10), tt(log1p), tt(logb), tt(sin), tt(sinh), tt(sqrt), tt(tan), tt(tanh), tt(y0), tt(y1). The tt(atan) function can optionally take a second argument, in which case it behaves like the C function tt(atan2). The tt(ilogb) function takes a single floating point argument, but returns an integer. The function tt(signgam) takes no arguments, and returns an integer, which is the C variable of the same name, as described in manref(gamma)(3). Note that it is therefore only useful immediately after a call to tt(gamma) or tt(lgamma). Note also that `tt(signgam())' and `tt(signgam)' are distinct expresssions. The following functions take two floating point arguments: tt(copysign), tt(fmod), tt(hypot), tt(nextafter). The following take an integer first argument and a floating point second argument: tt(jn), tt(yn). The following take a floating point first argument and an integer second argument: tt(ldexp), tt(scalb). The function tt(abs) does not convert the type of its single argument; it returns the absolute value of either a floating point number or an integer. The functions tt(float) and tt(int) convert their arguments into a floating point or integer value (by truncation) respectively. Note that the C tt(pow) function is available in ordinary math evaluation as the `tt(**)' operator and is not provided here.