fixacos
Fixed point inverse cosine lookup table.
Description
This function finds the inverse cosine of a value using a lookup table. The
input value must be a fixed point radian. The inverse cosine is defined
only in the domain from `-1' to `1'. Outside of this input range, the
function will set `errno' to EDOM and return zero. Example:
fixed result;
/* Sets `result' to binary angle 128. */
result = fixacos(itofix(-1));
Returns the inverse sine of a fixed point value, measured as fixed point
binary format angle, or zero if the input was out of range. All return
values of this function will be in the range `0' to `128'.
Related Projects
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