Offsets and multipliers in Igor Pro

A trace can be shifted and scaled for display without touching the data.

Function OffsetStack()
    String traces = TraceNameList("", ";", 1)
    Variable i, n = ItemsInList(traces)

    for (i = 0; i < n; i += 1)
        String name = StringFromList(i, traces)
        ModifyGraph offset($name)={0, i * 1.5}
        ModifyGraph muloffset($name)={0, 1}
    endfor

    SetAxis/A left
End

How it works

1. offset(trace)={dx, dy} moves it; muloffset scales it first.
2. The wave keeps its values; only the drawing changes.
3. That is how a stacked plot avoids making four copies of the data.

Keywords and builtins used here

• End
• Function
• ItemsInList
• ModifyGraph
• SetAxis
• String
• StringFromList
• TraceNameList
• Variable
• endfor
• for
• i

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Step 3 of 6 in Styling, step 8 of 19 in Graphs & presentation.

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