User-Defined Units

 

You can assign your own units to a series. Again, keep in mind that DADiSP can more reliably determine the proper unit for complex results with internally-defined units than with user-defined units. During series operations, the horizontal (time axis) units are maintained if the horizontal units of the operands are the same. If the horizontal units are not the samefor example, Seconds for W1 and UNKNOWN for W2then the resulting horizontal units are UNKNOWN for all cases involving W1 and W2.

 

Calculus operations change the y-axis units. In general, the DERIV functions yield y-axis units that are the original y-axis units divided by the original x-axis units. The INTEG function yields units of the original y-axis units multiplied by the original x-axis units.

 

DADiSP understands fundamental relationships between units: if you multiply Amps by Voltage, for instance, the resulting units will be Watts (Power).

 

Use the DEFUNITS function to define a new unit in terms of other fundamental units. For example.

 

defunits("Webers", "V*s", "Wb")

 

defines a new unit Weber with the abbreviation of Wb. Any series with units of V*s will be reduced to Webers.

 

W1: 1..100;setvunits("V")

W2: integ(w1)

getvunits(w2)

 

GETVUNITS now returns Webers.