Gnuplot Range Factor of Number

Question

For a lack of a better way to describe it, I want to apply a modulo to an rrange expression in Gnuplot 5.0 in order to ensure that the max is "rounded" to the nearest 10 units. I think that I'm on the right track, but am curious whether there is a more elegant method to accomplish this. For example, this yields what I want:

max_range = int(STATS_max)

if (max_range == 0) {
    max_range = 1
}

while (max_range % 10 != 0) {
    max_range = (max_range + 1)
}

So, for example, a STATS_max value of 13.2 yields a max_range of 20.

Thanks in advance, Dave

Just as a follow-up to @Christoph's excellent answer below. For my purposes, I still need to retain the code segment above that ensures that max_range does not equal zero. Applying ceil() to zero yields zero which, while accurate, is an illegal value for range max value. Error: "Can't plot with an empty y range!" — DaveL17
– DaveL17, Commented Jul 21, 2015 at 19:52

Christoph · Accepted Answer · 2015-07-21 15:34:28Z

3

First divide your max_range by 10, apply the ceil function (takes the next larger integer value) and multiply the result by 10:

max_range = ceil(STATS_max / 10.0) * 10.0

answered Jul 21, 2015 at 15:34

Christoph

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1 Comment

DaveL17 Over a year ago

Brilliant. Thanks very much Christoph!

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