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In writing the user manual for a piece of software, I'm trying to communicate the relationship between a numerical control, which I'll call frob, and two properties, which I'll call foo and bar.

Currently I have something to the effect of:

When frob is set to zero, foo and bar are unaffected by step. As frob is increased, foo increases, and bar decreases; as frob is decreased, foo decreases and bar increases.

Is there a more concise and easier to parse way to communicate this relationship to a non-technical audience?

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    Define step. Are you trying to say that foo and bar are inversely related as a function of frob?
    – user57832
    Commented Oct 12, 2023 at 2:01
  • I think we need to know what the actual meanings of frob, foo, bar, and step are.
    – alphabet
    Commented Oct 12, 2023 at 4:06
  • You could look at english.stackexchange.com/questions/526360/a-decreases-with-b
    – Stuart F
    Commented Oct 12, 2023 at 9:34
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    In mathematics we would often just say that "foo is an increasing function of frob and bar is a decreasing function of frob". The inverse relationship between foo and bar is then implied.
    – Ubiquitous
    Commented Oct 12, 2023 at 12:59
  • You could use something like "vice versa when it's decreased".
    – Barmar
    Commented Oct 12, 2023 at 15:42

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I would say:

When frob is set to zero, foo and bar are unaffected by step. As frob increases or decreases, foo does the same while bar does the opposite.

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