std (MathScript RT Module Function)
Owning Class: statistics
Requires: MathScript RT Module
Syntax
y = std(x)
y = std(x, w)
y = std(x, w, d)
Description
Returns the standard deviation of a vector or matrix. This function works column-wise for matrices by default.
Inputs
| Name | Description | ||||
|---|---|---|---|---|---|
| x | Specifies a vector or matrix. | ||||
| w | Specifies a weight. w is a vector. | ||||
| d | Specifies the dimension of x across which to calculate the standard deviation if x is a matrix. d is a scalar that accepts the following values.
|
Outputs
| Name | Description |
|---|---|
| y | Returns the standard deviation of x. y is a scalar or vector. |
Details
w can be in one of the following three states:- If x is a vector, w is a vector of the same size as x. If x is a matrix, w is a vector of the same size as the dimension of x across which to calculate the standard deviation. All elements in w must be greater than 0. LabVIEW normalizes w so the sum of all the elements in w is equal to 1.
- w is a vector with only one element, 1. The input matrix has no weight. LabVIEW normalizes the output by the length of the input matrix.
- w is a vector with only one element, 0, or w is an empty matrix. The input matrix has no weight. LabVIEW normalizes the output by the length of the input matrix minus one.
Examples
X = [1, 2, 3, 4, 5, 6; 2, 4, 6, 8, 10, 12]
Y = std(X)