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fix(transforms): avoid NaN at CurveInterpolator's lowest sample point #1005

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Merged
mairas merged 1 commit into from
Jun 16, 2026
Merged

fix(transforms): avoid NaN at CurveInterpolator's lowest sample point #1005

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8 changes: 7 additions & 1 deletion src/sensesp/transforms/curveinterpolator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,13 @@ void CurveInterpolator::set(const float& input) {
if (it != samples_.end()) {
float x1 = it->input_;
float y1 = it->output_;
output_ = (y0 * (x1 - input) + y1 * (input - x0)) / (x1 - x0);
if (x1 == x0) {
// Exact hit on a sample point (e.g. the lowest one, where the search
// never advances past begin()) — avoid a zero-width interval divide.
output_ = y1;
} else {
output_ = (y0 * (x1 - input) + y1 * (input - x0)) / (x1 - x0);
}
} else {
// Hit the end of the table with no match, calculate output using the
// gradient from the last two points
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