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# datefind

Indices of date numbers in matrix

## Syntax

```Indices = datefind(Subset, Superset, Tolerance)
```

## Arguments

 Subset Subset matrix of date numbers used to find matching date numbers in Superset. These date numbers must be a nonrepeating subset of those in Superset. Superset Superset matrix of nonrepeating date numbers whose elements are sought. Tolerance (Optional) Tolerance (+/-) for matching the date numbers in Superset. A positive integer. Default = 0.

## Description

Indices = datefind(Subset, Superset, Tolerance) returns a vector of indices to the date numbers in Superset that are present in Subset, plus or minus the Tolerance. If no date numbers match, Indices = [].

Although this function was designed for use with sequential date numbers, you can use it with any nonrepeating integers.

## Examples

expand all

### Return a Vector of Indices to Date Numbers

This example shows how to return a vector of indices to date numbers.

```Superset = datenum(1999, 7, 1:31);
Subset = [datenum(1999, 7, 10); datenum(1999, 7, 20)];
Indices = datefind(Subset, Superset, 1)
```
```Indices =

9
10
11
19
20
21

```