A chaotic character evaluating apparatus includes a processor for
predicting future variation in sequential data and a processing for
determining a degree of accuracy of the prediction, a processor for
predicting variation of the sequential data in reverse and a processor for
determining a degree of accuracy of the prediction, and a processing for
comparing the degrees of accuracy with each other. If the degrees of the
accuracy differ from each other, the variation of the sequential data is
determined to be attributable to chaos, while when the degrees of accuracy
are substantially equal to each other, the variation in the sequential
data is determined to be attributable to noise. Further, a control
apparatus for generating a control value from a feedback signal output
from an object under control and having chaotic components eliminated is
realized. Thus, it is possible to easily and accurately determine whether
variation in the sequential data is attributable to chaos or noise.
