spice

v1 1 0 v
y1 0 1 {1/r}

v2 2 0 v
y2 0 2 {1/r}

.param v=-1
.param r=1

.list

.print dc i(v*)
.dc r 1 2 1
.dc y1 1 2 1

.dc r 1 2 1
.dc y1 1 2 1

.print dc i(y*)
.dc r 1 2 1
.dc y1 1 2 1

.end