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A basic question about vex

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rcyl4
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Joined: 5月 2023
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I want the previous point on the curve to always be higher than the next one,I don't know what's wrong with the code.But I found that reading the P attribute of i-1 is always a fixed value

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viklc
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Joined: 5月 2017
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When running over detail you can use a for loop:
for (int i = 0; i < npoints(0); ++i)
{
    vector prev_pos = point(0, 'P', i - 1);
    setpointattrib(0, 'prev_pos', i, prev_pos, 'set');
}

As run over points you dont need to iterate again over all points:
v@prev_pos = point(0, 'P', @ptnum - 1);

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