# PITCH

The PITCH function computes the second angle, in radians, of a body-3 Yaw-Pitch-Roll rotation sequence.

PITCH(I, J)

## Description

Given two coordinate systems, I and J, which are initially having the same orientation, this rotation sequence is defined as follows:
• First, rotate in a counterclockwise direction about the z-axis of the I coordinate system [YAW].
• Second, rotate counterclockwise about the negative y-axis of the I coordinate system [PITCH].
• Third, rotate counterclockwise about the x-axis of the I coordinate system [ROLL].

The first argument, marker I, must be specified. The second argument, marker J, is optional.

## Arguments

I
The marker whose rotational displacement is to be computed.
J
The marker with respect to which the rotational displacement is to be computed. This argument is optional. If omitted, it defaults to the ground coordinate system.

## Example

<Post_Request
comment   = "Vehicle Orientation (degress)"
id        = "70000256"
type      = "EXPRESSION"
expr1     = "NULL"
expr2     = "YAW(30301010,30101010)*RTOD"
expr3     = "PITCH(30301010,30101010)*RTOD"
expr4     = "ROLL(30301010,30101010)*RTOD"
/>

## Comments

The figure below shows the physical meaning of the Yaw-Pitch-Roll rotation sequence.