Merge pull request #3 from DragonGhost7/feature/trig_functions

added cot,sec, and csc trig functions
zahash · Oct 27, 2023 · 5b369c4 · 5b369c4
2 parents 7d62834 + 1e1fda8
commit 5b369c4
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/src/eval.rs b/src/eval.rs
@@ -170,6 +170,18 @@ impl<'text> Eval<'text> for PostfixExpr<'text> {
                 ("tanh", [rad]) => Ok(rad.eval(state)?.tanh()),
                 ("atan", [rad]) => Ok(rad.eval(state)?.atan()),
                 ("atanh", [rad]) => Ok(rad.eval(state)?.atanh()),
+                ("cot", [rad]) => Ok(rad.eval(state)?.tan().recip()),
+                ("coth", [rad]) => Ok(rad.eval(state)?.tanh().recip()),
+                ("acot", [rad]) => Ok(std::f64::consts::FRAC_PI_2 - rad.eval(state)?.atan()),
+                ("acoth", [rad]) => Ok(0.5 * ( 2.0 /(rad.eval(state)? - 1.0)).ln_1p()),
+                ("sec", [rad]) => Ok(rad.eval(state)?.cos().recip()),
+                ("sech", [rad]) => Ok(rad.eval(state)?.cosh().recip()),
+                ("asec", [rad]) => Ok((rad.eval(state)?.recip()).acos()),
+                ("asech", [rad]) => Ok((rad.eval(state)?.recip() + ((rad.eval(state)?).powi(-2) - 1.0_f64).sqrt()).ln()),
+                ("csc", [rad]) => Ok(rad.eval(state)?.sin().recip()),
+                ("csch", [rad]) => Ok(rad.eval(state)?.sinh().recip()),
+                ("acsc", [rad]) => Ok((rad.eval(state)?.recip()).asin()),
+                ("acsch", [rad]) => Ok((rad.eval(state)?.recip() + ((rad.eval(state)?).powi(-2) + 1.0_f64).sqrt()).ln()),
                 _ => Err(EvalError::InvalidFnCall(format!("{}", self))),
             },
         }