Adding Interactive Data Language (IDL) support.

samples/IDL/mg_acosh.pro

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+; docformat = 'rst'
+
+;+
+; Inverse hyperbolic cosine. Uses the formula:
+; 
+; $$\text{acosh}(z) = \ln(z + \sqrt{z + 1} \sqrt{z - 1})$$
+;
+; :Examples:
+;    The arc hyperbolic sine function looks like::
+;
+;       IDL> x = 2.5 * findgen(1000) / 999. + 1.
+;       IDL> plot, x, mg_acosh(x), xstyle=1
+;
+;    This should look like:
+;
+;    .. image:: acosh.png
+;
+; :Returns:
+;    float, double, complex, or double complex depending on the input
+;
+; :Params:
+;    z : in, required, type=numeric
+;       input
+;-
+function mg_acosh, z
+  compile_opt strictarr
+  
+  return, alog(z + sqrt(z + 1) * sqrt(z - 1))
+end