Purpose

---

  Calculates the weighted mean of a set of measurements.

Category

---

  Statistics

Calling Sequence

---

  result = wmean(val, dval, [/nan, error = error])
 

Inputs

---

  val : A vector of data values
  dval: The error on each data value

Keyword Parameters

---

  nan: If set, treat NANs as missing data
  error: Set to a named variable to hold the error on the weighted
        mean
 

Outputs

---

  The weighted mean

Modification History

---

  April 2009 Written by Chris Beaumont
  April 23 2009 fixed integer truncation bug