ABS
| Returns the absolute value of X. |

CEIL
| Returns the closest integer greater than or equal to X. |

CIR_3PNT
| Returns radius and center of circle, given 3 points. |

DIAG_MATRIX
| Constructs a diagonal matrix from an input vector, or if given a matrix, then extracts a diagonal vector. |

DIST
| Creates array with each element proportional to its frequency. |

EXP
| Returns the natural exponential function of given expression. |

FLOOR
| Returns closest integer less than or equal to argument. |

IDLUNIT
| Performs basic dimensional analysis, conversions, and mathematical operations, all while factoring units. |

ISHFT
| Performs integer bit shift. |

MATRIX_MULTIPLY
| Calculates the IDL matrix-multiply operator (#) of two (possibly transposed) arrays. |

MATRIX_POWER
| Computes the product of a matrix with itself. |

PNT_LINE
| Returns the perpendicular distance between a point and a line. |

POLY_AREA
| Returns the area of a polygon given the coordinates of its vertices. |

PRIMES
| Computes the first K prime numbers. |

PRODUCT
| Returns the product of elements within an array. |

ROUND
| Returns the integer closest to its argument. |

SPH_4PNT
| Returns center and radius of a sphere given 4 points. |

SQRT
| Returns the square root of X. |

VOIGT
| Calculates intensity of atomic absorption line (Voight) profile. |