Block Category: Arithmetic, Fixed Point
Inputs: Real, complex, or fixed-point (scaled_int) scalars, or vectors or matrices.
Description: The -X block negates the input signal.
Label: Indicates a user-defined block label that appears when View > Block Labels is activated.
1. Negation of a scalar
Consider the equation y(t) = - sin(t) realized as:
A ramp block is used to access simulation time t, a sin block generates sin(t), and a -X block converts sin(t) to -sin(t). Both sin(t) and y(t) are plotted for comparison.
2. Negation of a vector
Consider the equation:
z = -x
where x = [-1 5.6 4] realized as:
A scalarToVector block generates a three-element vector from the constant values -1, 5.6, and 4. When the simulation runs, the -X block performs an element-by-element negate operation on the incoming vector.
3. Negation of a matrix
Consider the equation:
Z = -X
where 
realized as:
When the simulation runs, the -X block performs an element-by-element negate operation on the incoming matrix.