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GNU Octave Manual Version 3
by John W. Eaton, David Bateman, Søren Hauberg
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3.1.2 Missing Data

It is possible to represent missing data explicitly in Octave using NA (short for “Not Available”). Missing data can only be represented when data is represented as floating point numbers. In this case missing data is represented as a special case of the representation of NaN.

Built-in Function: NA (x)
Built-in Function: NA (n, m)
Built-in Function: NA (n, m, k, ...)
Built-in Function: NA (..., class)
Return a matrix or N-dimensional array whose elements are all equal to the special constant used to designate missing values.

Mapping Function: isna (x)
Return 1 for elements of x that are NA (missing) values and zero otherwise. For example,

isna ([13, Inf, NA, NaN])
     => [ 0, 0, 1, 0 ]
ISBN 095461206XGNU Octave Manual Version 3See the print edition