IRIS Toolbox Reference Manual

## datcmp

Compare two IRIS serial date numbers

#### Syntax

    Flag = datcmp(Dat1,Dat2)

#### Input arguments

- `Dat1`, `Dat2` [ numeric ] - IRIS serial date numbers or vectors.

#### Output arguments

- `Flag` [ `true` | `false` ] - True for numbers that represent the same date.

#### Description

The two date vectors must either be the same lengths, or one of them must be scalar.

Use this function instead of the plain comparison operator, `==`, to compare dates. The plain comparision can sometimes give false results because of round-off errors.

#### Example

    d1 = qq(2010,1);
    d2 = qq(2009,1):qq(2010,4);
    datcmp(d1,d2)
    ans =
        0     0     0     0     1     0     0     0

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