Abstract: The result of a first calculation may be determined by one of two alternative calculations. Each of the alternative calculations has an error associated therewith (due to factors such as measurement imprecision, rounding, etc.), and these errors propagate to the first calculation. However, there may also be error in the first calculation due to uncertainty about which of the alternative calculations applies. Such error can be taken into account based on the respective probabilities that the first and second calculations will apply, as well as the difference in the results produced by the two calculations.

Abstract: The result of a first calculation may be determined by one of two alternative calculations. Each of the alternative calculations has an error associated therewith (due to factors such as measurement imprecision, rounding, etc.), and these errors propagate to the first calculation. However, there may also be error in the first calculation due to uncertainty about which of the alternative calculations applies. Such error can be taken into account based on the respective probabilities that the first and second calculations will apply, as well as the difference in the results produced by the two calculations.

Abstract: A wheelchair swing away system for providing a wheelchair operator multiple joystick control locations. The wheelchair swing away system includes a first mounting rod attached to a wheel chair by a mounting bracket, a second mounting rod rotatably connected to the first mounting rod through a first pivot pin and a control mount rotatably connected to the second mounting rod through a second pivot pin. The mounting bracket attaches to existing structure of the wheelchair and allows the first mounting rod to slide and rotate within the mounting bracket. The second mounting rod is comprised of a second rod that is rotatably connected to a first rod, with the rods fixed together by a fastener when a desired orientation is obtained.