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authorNick Hollinghurst <nick.hollinghurst@raspberrypi.com>2023-12-06 17:27:43 +0000
committerKieran Bingham <kieran.bingham@ideasonboard.com>2024-01-09 15:39:02 +0000
commite71d63ce1bfa9784e18852fec264357bda5e3671 (patch)
tree0f609ccc032c363d9fee9a9020a36151ea47bb94 /src/ipa/rpi/controller
parent12fb8ed5cbcd064de860928ede30abc9273fb743 (diff)
ipa: rpi: Allow the mean of an empty histogram interval
Don't assert when taking the weighted mean of a zero-width or zero-weight interval; return its upper bound. That is certainly correct in the zero-width case, and plausible otherwise. Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Reviewed-by: Naushir Patuck <naush@raspberrypi.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'src/ipa/rpi/controller')
-rw-r--r--src/ipa/rpi/controller/histogram.cpp10
1 files changed, 8 insertions, 2 deletions
diff --git a/src/ipa/rpi/controller/histogram.cpp b/src/ipa/rpi/controller/histogram.cpp
index 0a27ba2c..78116141 100644
--- a/src/ipa/rpi/controller/histogram.cpp
+++ b/src/ipa/rpi/controller/histogram.cpp
@@ -47,7 +47,7 @@ double Histogram::quantile(double q, int first, int last) const
double Histogram::interBinMean(double binLo, double binHi) const
{
- assert(binHi > binLo);
+ assert(binHi >= binLo);
double sumBinFreq = 0, cumulFreq = 0;
for (double binNext = floor(binLo) + 1.0; binNext <= ceil(binHi);
binLo = binNext, binNext += 1.0) {
@@ -57,13 +57,19 @@ double Histogram::interBinMean(double binLo, double binHi) const
sumBinFreq += bin * freq;
cumulFreq += freq;
}
+
+ if (cumulFreq == 0) {
+ /* interval had zero width or contained no weight? */
+ return binHi;
+ }
+
/* add 0.5 to give an average for bin mid-points */
return sumBinFreq / cumulFreq + 0.5;
}
double Histogram::interQuantileMean(double qLo, double qHi) const
{
- assert(qHi > qLo);
+ assert(qHi >= qLo);
double pLo = quantile(qLo);
double pHi = quantile(qHi, (int)pLo);
return interBinMean(pLo, pHi);