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cln |
Function (ROM Call 0x147) |
Complex natural logarithm (base e).
cln calculates the natural logarithm w = ln(z) of the complex
number which real and imaginary parts are z_re and
z_im, and stores real and imaginary part of the result
in floating point destinations pointed to by w_re and
w_im. The complex logarithm is defined by
ln(z) = log(abs(z)) + i arg(z)
where abs(z) = sqrt(z_re^2+z_im^2), arg(z) = atan2(z_im, z_re)
and log is the real natural logarithm. See
also sqrt and atan2.
Uses: atan2, fabs, is_inf, is_nan, log, _bcd_math
Used by: clog10, push_exponentiate