v-delta-zahlen
hio/nwt-gus-hi/v-delta-zahlen
Calculates difference between current and past input values.
v-delta-zahlen
@/v-delta-zahlen
Calculates difference between current and past input values.
INnumber
Input value
UPDpulse
Update: trigger a calculation and store the current `IN` value as the new “past” value.
RSTpulse
Resets the stored past value to the current input value. Efficiently sets `OUT` to 0.
OUTnumber
The last difference value.
C++ implementation
#pragma XOD evaluate_on_pin disable
#pragma XOD evaluate_on_pin enable input_RST input_UPD
#pragma XOD dirtieness disable output_OUT
node {
Number refValue = 0;
void evaluate(Context ctx) {
auto inValue = getValue<input_IN>(ctx);
if (isInputDirty<input_RST>(ctx)) {
refValue = inValue;
emitValue<output_OUT>(ctx, 0);
return;
}
if (!isInputDirty<input_UPD>(ctx)) {
return;
}
auto outValue = inValue - refValue;
emitValue<output_OUT>(ctx, outValue);
refValue = inValue;
}
}Tabular tests
| IN | UPD | RST | OUT |
| 0 | no-pulse | no-pulse | 0 |
| 10 | pulse | no-pulse | 10 |
| 30 | no-pulse | no-pulse | 10 |
| 20 | no-pulse | pulse | 0 |
| 30 | pulse | no-pulse | 10 |
| 50 | pulse | no-pulse | 20 |
| 10 | pulse | no-pulse | -40 |
| 10 | pulse | pulse | 0 |
| 5 | pulse | no-pulse | -5 |