I’ve noticed that when “Mod” and “Which” are used to the same effect, they plot to slightly different results. Take the following example:

f[x_] = 2 x;

fmod[x_] = Mod[f[x], 1];

Plot[fmod[x], {x, 0, 1}]

fwhich[x_] = Which[x < 1/2, f[x], x > 1/2, f[x] – 1];

Plot[fwhich[x], {x, 0, 1}]

The output graphs are:

How can I graph Which without getting that connecting line?

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1 Answer

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As MarcoB already pointed out in the comments, Piecewise is probably the better alternative.

Additionally, we already have a related question with good answers where you can steal ideas from:

f[x_] = 2 x;

fmod[x_] = Mod[f[x], 1];

fwhich[x_] = Which[x < 1/2, f[x], x > 1/2, f[x] – 1];

Plot[fwhich[x], {x, 0, 1}, Exclusions -> {1/2}]