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Linear: | Linear: | ||
| − | An example of an linear function is | + | An example of an linear function is <math>\ y(t) = 3x(t + 8)</math> |
| + | |||
| + | because the result of the 1st method above yields <math>\ 3ax(t + 8) + 3bx(t + 8)</math> | ||
| + | |||
| + | and the result of the 2nd method above yields <math>\ 3[ax(t + 8) + bx(t + 8)]</math>. Because they yield the same result the system is linear. | ||
Non-Linear: | Non-Linear: | ||
| − | An example of a non-linear function is <math>\ | + | An example of a non-linear function is <math>\ y(t) = e^{x(t)} </math> |
because the result of the 1st method above yields <math>\ e^{ax(t)} + e^{bx(t)}</math> | because the result of the 1st method above yields <math>\ e^{ax(t)} + e^{bx(t)}</math> | ||
and the result of the 2nd method above yields <math>\ e^{ax(t) + bx(t)}</math>, which is not equal to the first result. | and the result of the 2nd method above yields <math>\ e^{ax(t) + bx(t)}</math>, which is not equal to the first result. | ||
Latest revision as of 11:22, 12 September 2008
Definition
If Z(t) and W(t) in the following are equal the system is linear.
Examples
Linear:
An example of an linear function is $ \ y(t) = 3x(t + 8) $
because the result of the 1st method above yields $ \ 3ax(t + 8) + 3bx(t + 8) $
and the result of the 2nd method above yields $ \ 3[ax(t + 8) + bx(t + 8)] $. Because they yield the same result the system is linear.
Non-Linear:
An example of a non-linear function is $ \ y(t) = e^{x(t)} $
because the result of the 1st method above yields $ \ e^{ax(t)} + e^{bx(t)} $
and the result of the 2nd method above yields $ \ e^{ax(t) + bx(t)} $, which is not equal to the first result.
