# isValley

Syntax

isValley(X, [strict=true])

Arguments

X is a numeric vector/matrix/table.

strict is a Boolean value. The default value is true.

• If strict = true, the adjacent elements cannot be NULL and are strictly greater than the element;

• If strict = false, the adjacent elements cannot be NULL and are no smaller than the element.

Details

If X is a vector, check if each element in X is the valley.

If X is a matrix, perform the aforementioned calculations on each column and return a matrix of the same size as X.

If X is a table, only the numeric columns are involved in the calculations.

Examples

```\$ v = [3.1, 2.2, 2.2, 2.2, 1.3, 2.1, 1.2]
\$ isValley(v)
[0,0,0,0,1,0,0]

\$ v = [3.1, 2.2, 2.2, 2.2, 2.6, 1, 1.2]
\$ isValley(v)
[0,0,0,0,0,1,0]
\$ isValley(v, false)
[0,1,1,1,0,1,0]

// Perform the calculations on each column in a matrix
\$ m = matrix(5.3 5.8 5.6 NULL 5.7 1.2, 4.5 3.5 4.6 2.8 3.9 NULL)
\$ isValley(m)
```

#0

#1

0

0

0

1

0

0

0

1

0

0

0

0

```// Perform the calculations on the numeric columns in a table
\$ t = table(`01`01`00`01`02`00 as id, 2022.01.01 + 1..6 as date, 388.3 390.6 390.8 390.6 390.3 391.5 as price)
\$ isValley(t)
```

id

date

price

01

2022.01.02

0

01

2022.01.03

0

00

2022.01.04

0

01

2022.01.05

0

02

2022.01.06

1

00

2022.01.07

0

Related function: isPeak