fix typo

oscardssmith · oscardssmith · commit 5a4b4b32a2b1 · 2022-01-11T21:32:20.000-05:00
diff --git a/src/chebyshev.jl b/src/chebyshev.jl
@@ -6,7 +6,7 @@ function chbevl(x::Union{Float32, Float64}, coeff)
     for i in 2:length(coeff)
         b2 = b1
         b1 = b0
-        b0 = muladd(x, b1, b2) + coeff[i]
+        b0 = muladd(x, b1, -b2) + coeff[i]
     end
 
     return (b0 - b2)/2
