# DELTAX

## Purpose:

Returns the delta x increment of a series
or table, i.e. the inverse of the sample rate.

## Syntax:

DELTAX(series)

series |
- |
Optional. A series or table. Defaults to the
current Window. |

## Returns:

A scalar.

## Example:

deltax(gsin(20,.05))

returns 0.05, the inverse of the sampling
rate.

## Example:

W1: gnorm(1000, 1/1000)

W2: gnorm(length(w1), deltax(w1))

W2 contains a random series with the same
length and deltax as W1.

## Remarks:

When referencing a table, DELTAX returns
the delta x increment of the first column in the table.

Many series have X values that are monotonically
rising by a constant X increment such that:

A series with X values of this form is
referred to as an interval series.
Because any X value from an interval series can be computed with:

an interval series requires only the DELTAX
and XOFFSET values to determine
the X values. Thus, for an interval series, explicit X values are not
necessary, decreasing the data storage requirements by a factor of 2.
Also, because the X values for an interval series are regularly monotonic,
speed optimizations for plotting and computations are available.

See XY
to create a series with irregularly spaced X values.

## See Also:

DELTAY

RATE

SETDELTAX

SETDELTAY

SETXOFFSET

SETYOFFSET

XOFFSET

YOFFSET