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doing math on plots


How would one plot, for example, the difference between two vectors?
I tried this in a text box:

.save foo=(‘v(/input)-v(/output2)’)
.tran 10u 50m

but "foo" does not show up in the list of vectors to display in the plot window.

Another thing, I found that one can use parameters for values, for
example {Rx} for a resistor value and then add a textbox with ".param
Rx=100k". Would it be possible to simultaneous get plots for a set of
different values of Rx?


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