Create array of all `NaN`

values

`X = NaN`

returns the scalar representation of
"not a number". Operations return `NaN`

when they have undefined numeric
results, such as `0/0`

or `0*Inf`

.

`X = NaN(`

returns an
`sz1,...,szN`

)`sz1`

-by-...-by-`szN`

array of `NaN`

values, where `sz1,...,szN`

indicate the size of each dimension. For
example, `NaN(3,4)`

returns a 3-by-4 matrix.

`X = NaN(___,`

returns an
array of `typename`

)`NaN`

values of data type `typename`

, which can
be either `'single'`

or `'double'`

.

`X = NaN`

returns the scalar, type`double`

, IEEE^{®}representation of "not a number". The exact bit-wise hexadecimal representation of this value is`fff8000000000000`

. MATLAB^{®}preserves the "not a number" status of alternate`NaN`

representations and treats all representations equivalently. In some special cases, due to hardware limitations for example, MATLAB does not preserve the exact bit pattern of the alternate representations during computation, and instead uses the canonical`NaN`

bit pattern previously described.`NaN`

values are not equal to each other. As a result, comparison operations involving`NaN`

return false, except for the not equal operator`~=`

. For example,`NaN == NaN`

returns logical 0 (`false`

) but`NaN ~= NaN`

returns logical 1 (`true`

).`NaN`

values in a vector are treated as different unique elements. For example,`unique([1 1 NaN NaN])`

returns the row vector`[1 NaN NaN]`

.Use the

`isnan`

or`ismissing`

function to detect`NaN`

values in an array. The`rmmissing`

function detects and removes`NaN`

values, and the`fillmissing`

function detects`NaN`

values and replaces them with non-`NaN`

values.