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-rw-r--r--src/algebra/plot.spad.pamphlet2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/algebra/plot.spad.pamphlet b/src/algebra/plot.spad.pamphlet
index 8f4731b2..fdeeafed 100644
--- a/src/algebra/plot.spad.pamphlet
+++ b/src/algebra/plot.spad.pamphlet
@@ -284,7 +284,7 @@ Plot(): Exports == Implementation where
xDiff = 0 or yDiff = 0 => curve
l := lo tRange; h := hi tRange
(tDiff := h-l) = 0 => curve
--- if (EQL(yDiff, quietDoubleNaN()$Lisp)$Lisp) then yDiff := 1::F
+-- if (%sptreq(yDiff, quietDoubleNaN()$Lisp)$Foreign(Builtin)) then yDiff := 1::F
t := curve.knots
#t < 3 => curve
p := curve.points; f := curve.source