ngspice/examples/measure/meas_expression.cir

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* measurement examples with evaluating an expression 0.9*v(2)
* transient simulation of two sine signals with different frequencies
vac1 1 0 DC 0 sin(0 1 1.0k 0 0)
vac2 2 0 DC 0 sin(0 1.2 0.9k 0 0)
.tran 10u 5m
** evaluate '0.9*v(2)' in dot command
.measure tran yeval1 FIND v(2) WHEN v(1)=par('0.9*v(2)')
.control
run
** evaluate '0.9*v(2)' in control language command
let vint = 0.9*v(2)
meas tran yeval2 FIND v(2) WHEN v(1)= vint
plot V(1) v(2)
.endc
.end