
(FPCore (x y z t) :precision binary64 (+ x (* (- y x) (/ z t))))
double code(double x, double y, double z, double t) {
return x + ((y - x) * (z / t));
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = x + ((y - x) * (z / t))
end function
public static double code(double x, double y, double z, double t) {
return x + ((y - x) * (z / t));
}
def code(x, y, z, t): return x + ((y - x) * (z / t))
function code(x, y, z, t) return Float64(x + Float64(Float64(y - x) * Float64(z / t))) end
function tmp = code(x, y, z, t) tmp = x + ((y - x) * (z / t)); end
code[x_, y_, z_, t_] := N[(x + N[(N[(y - x), $MachinePrecision] * N[(z / t), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
x + \left(y - x\right) \cdot \frac{z}{t}
\end{array}
Sampling outcomes in binary64 precision:
Herbie found 9 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (x y z t) :precision binary64 (+ x (* (- y x) (/ z t))))
double code(double x, double y, double z, double t) {
return x + ((y - x) * (z / t));
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = x + ((y - x) * (z / t))
end function
public static double code(double x, double y, double z, double t) {
return x + ((y - x) * (z / t));
}
def code(x, y, z, t): return x + ((y - x) * (z / t))
function code(x, y, z, t) return Float64(x + Float64(Float64(y - x) * Float64(z / t))) end
function tmp = code(x, y, z, t) tmp = x + ((y - x) * (z / t)); end
code[x_, y_, z_, t_] := N[(x + N[(N[(y - x), $MachinePrecision] * N[(z / t), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
x + \left(y - x\right) \cdot \frac{z}{t}
\end{array}
(FPCore (x y z t) :precision binary64 (fma (/ z t) (- y x) x))
double code(double x, double y, double z, double t) {
return fma((z / t), (y - x), x);
}
function code(x, y, z, t) return fma(Float64(z / t), Float64(y - x), x) end
code[x_, y_, z_, t_] := N[(N[(z / t), $MachinePrecision] * N[(y - x), $MachinePrecision] + x), $MachinePrecision]
\begin{array}{l}
\\
\mathsf{fma}\left(\frac{z}{t}, y - x, x\right)
\end{array}
Initial program 98.0%
lift-+.f64N/A
+-commutativeN/A
lift-*.f64N/A
*-commutativeN/A
lower-fma.f6498.0
Applied rewrites98.0%
(FPCore (x y z t)
:precision binary64
(let* ((t_1 (/ (* (- y x) z) t)))
(if (<= (/ z t) -2000000000.0)
t_1
(if (<= (/ z t) 2e-28) (+ (* y (/ z t)) x) t_1))))
double code(double x, double y, double z, double t) {
double t_1 = ((y - x) * z) / t;
double tmp;
if ((z / t) <= -2000000000.0) {
tmp = t_1;
} else if ((z / t) <= 2e-28) {
tmp = (y * (z / t)) + x;
} else {
tmp = t_1;
}
return tmp;
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
real(8) :: t_1
real(8) :: tmp
t_1 = ((y - x) * z) / t
if ((z / t) <= (-2000000000.0d0)) then
tmp = t_1
else if ((z / t) <= 2d-28) then
tmp = (y * (z / t)) + x
else
tmp = t_1
end if
code = tmp
end function
public static double code(double x, double y, double z, double t) {
double t_1 = ((y - x) * z) / t;
double tmp;
if ((z / t) <= -2000000000.0) {
tmp = t_1;
} else if ((z / t) <= 2e-28) {
tmp = (y * (z / t)) + x;
} else {
tmp = t_1;
}
return tmp;
}
def code(x, y, z, t): t_1 = ((y - x) * z) / t tmp = 0 if (z / t) <= -2000000000.0: tmp = t_1 elif (z / t) <= 2e-28: tmp = (y * (z / t)) + x else: tmp = t_1 return tmp
function code(x, y, z, t) t_1 = Float64(Float64(Float64(y - x) * z) / t) tmp = 0.0 if (Float64(z / t) <= -2000000000.0) tmp = t_1; elseif (Float64(z / t) <= 2e-28) tmp = Float64(Float64(y * Float64(z / t)) + x); else tmp = t_1; end return tmp end
function tmp_2 = code(x, y, z, t) t_1 = ((y - x) * z) / t; tmp = 0.0; if ((z / t) <= -2000000000.0) tmp = t_1; elseif ((z / t) <= 2e-28) tmp = (y * (z / t)) + x; else tmp = t_1; end tmp_2 = tmp; end
code[x_, y_, z_, t_] := Block[{t$95$1 = N[(N[(N[(y - x), $MachinePrecision] * z), $MachinePrecision] / t), $MachinePrecision]}, If[LessEqual[N[(z / t), $MachinePrecision], -2000000000.0], t$95$1, If[LessEqual[N[(z / t), $MachinePrecision], 2e-28], N[(N[(y * N[(z / t), $MachinePrecision]), $MachinePrecision] + x), $MachinePrecision], t$95$1]]]
\begin{array}{l}
\\
\begin{array}{l}
t_1 := \frac{\left(y - x\right) \cdot z}{t}\\
\mathbf{if}\;\frac{z}{t} \leq -2000000000:\\
\;\;\;\;t\_1\\
\mathbf{elif}\;\frac{z}{t} \leq 2 \cdot 10^{-28}:\\
\;\;\;\;y \cdot \frac{z}{t} + x\\
\mathbf{else}:\\
\;\;\;\;t\_1\\
\end{array}
\end{array}
if (/.f64 z t) < -2e9 or 1.99999999999999994e-28 < (/.f64 z t) Initial program 98.3%
Taylor expanded in t around 0
lower-/.f64N/A
*-commutativeN/A
lower-*.f64N/A
lower--.f6494.3
Applied rewrites94.3%
if -2e9 < (/.f64 z t) < 1.99999999999999994e-28Initial program 97.7%
Taylor expanded in y around inf
associate-*l/N/A
lower-*.f64N/A
lower-/.f6492.8
Applied rewrites92.8%
Taylor expanded in y around inf
*-commutativeN/A
associate-*l/N/A
lower-*.f64N/A
lower-/.f6497.1
Applied rewrites97.1%
Final simplification95.8%
(FPCore (x y z t) :precision binary64 (let* ((t_1 (/ (* (- y x) z) t))) (if (<= (/ z t) -5e-14) t_1 (if (<= (/ z t) 2e-28) (fma (/ y t) z x) t_1))))
double code(double x, double y, double z, double t) {
double t_1 = ((y - x) * z) / t;
double tmp;
if ((z / t) <= -5e-14) {
tmp = t_1;
} else if ((z / t) <= 2e-28) {
tmp = fma((y / t), z, x);
} else {
tmp = t_1;
}
return tmp;
}
function code(x, y, z, t) t_1 = Float64(Float64(Float64(y - x) * z) / t) tmp = 0.0 if (Float64(z / t) <= -5e-14) tmp = t_1; elseif (Float64(z / t) <= 2e-28) tmp = fma(Float64(y / t), z, x); else tmp = t_1; end return tmp end
code[x_, y_, z_, t_] := Block[{t$95$1 = N[(N[(N[(y - x), $MachinePrecision] * z), $MachinePrecision] / t), $MachinePrecision]}, If[LessEqual[N[(z / t), $MachinePrecision], -5e-14], t$95$1, If[LessEqual[N[(z / t), $MachinePrecision], 2e-28], N[(N[(y / t), $MachinePrecision] * z + x), $MachinePrecision], t$95$1]]]
\begin{array}{l}
\\
\begin{array}{l}
t_1 := \frac{\left(y - x\right) \cdot z}{t}\\
\mathbf{if}\;\frac{z}{t} \leq -5 \cdot 10^{-14}:\\
\;\;\;\;t\_1\\
\mathbf{elif}\;\frac{z}{t} \leq 2 \cdot 10^{-28}:\\
\;\;\;\;\mathsf{fma}\left(\frac{y}{t}, z, x\right)\\
\mathbf{else}:\\
\;\;\;\;t\_1\\
\end{array}
\end{array}
if (/.f64 z t) < -5.0000000000000002e-14 or 1.99999999999999994e-28 < (/.f64 z t) Initial program 98.4%
Taylor expanded in t around 0
lower-/.f64N/A
*-commutativeN/A
lower-*.f64N/A
lower--.f6493.9
Applied rewrites93.9%
if -5.0000000000000002e-14 < (/.f64 z t) < 1.99999999999999994e-28Initial program 97.6%
lift-+.f64N/A
+-commutativeN/A
lift-*.f64N/A
lift-/.f64N/A
clear-numN/A
associate-/r/N/A
associate-*r*N/A
*-commutativeN/A
lower-fma.f64N/A
associate-*l/N/A
*-lft-identityN/A
lower-/.f6493.8
Applied rewrites93.8%
Taylor expanded in y around inf
lower-/.f6495.3
Applied rewrites95.3%
(FPCore (x y z t)
:precision binary64
(let* ((t_1 (fma (/ y t) z x)))
(if (<= t -8.5e-173)
t_1
(if (<= t -4e-299)
(* y (/ z t))
(if (<= t 1e-267) (* (- x) (/ z t)) t_1)))))
double code(double x, double y, double z, double t) {
double t_1 = fma((y / t), z, x);
double tmp;
if (t <= -8.5e-173) {
tmp = t_1;
} else if (t <= -4e-299) {
tmp = y * (z / t);
} else if (t <= 1e-267) {
tmp = -x * (z / t);
} else {
tmp = t_1;
}
return tmp;
}
function code(x, y, z, t) t_1 = fma(Float64(y / t), z, x) tmp = 0.0 if (t <= -8.5e-173) tmp = t_1; elseif (t <= -4e-299) tmp = Float64(y * Float64(z / t)); elseif (t <= 1e-267) tmp = Float64(Float64(-x) * Float64(z / t)); else tmp = t_1; end return tmp end
code[x_, y_, z_, t_] := Block[{t$95$1 = N[(N[(y / t), $MachinePrecision] * z + x), $MachinePrecision]}, If[LessEqual[t, -8.5e-173], t$95$1, If[LessEqual[t, -4e-299], N[(y * N[(z / t), $MachinePrecision]), $MachinePrecision], If[LessEqual[t, 1e-267], N[((-x) * N[(z / t), $MachinePrecision]), $MachinePrecision], t$95$1]]]]
\begin{array}{l}
\\
\begin{array}{l}
t_1 := \mathsf{fma}\left(\frac{y}{t}, z, x\right)\\
\mathbf{if}\;t \leq -8.5 \cdot 10^{-173}:\\
\;\;\;\;t\_1\\
\mathbf{elif}\;t \leq -4 \cdot 10^{-299}:\\
\;\;\;\;y \cdot \frac{z}{t}\\
\mathbf{elif}\;t \leq 10^{-267}:\\
\;\;\;\;\left(-x\right) \cdot \frac{z}{t}\\
\mathbf{else}:\\
\;\;\;\;t\_1\\
\end{array}
\end{array}
if t < -8.4999999999999996e-173 or 9.9999999999999998e-268 < t Initial program 97.6%
lift-+.f64N/A
+-commutativeN/A
lift-*.f64N/A
lift-/.f64N/A
clear-numN/A
associate-/r/N/A
associate-*r*N/A
*-commutativeN/A
lower-fma.f64N/A
associate-*l/N/A
*-lft-identityN/A
lower-/.f6495.5
Applied rewrites95.5%
Taylor expanded in y around inf
lower-/.f6481.3
Applied rewrites81.3%
if -8.4999999999999996e-173 < t < -3.99999999999999997e-299Initial program 99.8%
lift-+.f64N/A
+-commutativeN/A
lift-*.f64N/A
*-commutativeN/A
lower-fma.f6499.8
Applied rewrites99.8%
Taylor expanded in y around inf
*-commutativeN/A
associate-*l/N/A
lower-*.f64N/A
lower-/.f6478.5
Applied rewrites78.5%
if -3.99999999999999997e-299 < t < 9.9999999999999998e-268Initial program 99.9%
lift-+.f64N/A
+-commutativeN/A
lift-*.f64N/A
*-commutativeN/A
lower-fma.f6499.9
Applied rewrites99.9%
Taylor expanded in t around 0
lower-/.f64N/A
*-commutativeN/A
lower-*.f64N/A
lower--.f6499.6
Applied rewrites99.6%
Taylor expanded in y around 0
Applied rewrites84.3%
Applied rewrites91.8%
Final simplification81.4%
(FPCore (x y z t) :precision binary64 (if (<= (/ z t) -5e-14) (* y (/ z t)) (fma (/ y t) z x)))
double code(double x, double y, double z, double t) {
double tmp;
if ((z / t) <= -5e-14) {
tmp = y * (z / t);
} else {
tmp = fma((y / t), z, x);
}
return tmp;
}
function code(x, y, z, t) tmp = 0.0 if (Float64(z / t) <= -5e-14) tmp = Float64(y * Float64(z / t)); else tmp = fma(Float64(y / t), z, x); end return tmp end
code[x_, y_, z_, t_] := If[LessEqual[N[(z / t), $MachinePrecision], -5e-14], N[(y * N[(z / t), $MachinePrecision]), $MachinePrecision], N[(N[(y / t), $MachinePrecision] * z + x), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;\frac{z}{t} \leq -5 \cdot 10^{-14}:\\
\;\;\;\;y \cdot \frac{z}{t}\\
\mathbf{else}:\\
\;\;\;\;\mathsf{fma}\left(\frac{y}{t}, z, x\right)\\
\end{array}
\end{array}
if (/.f64 z t) < -5.0000000000000002e-14Initial program 98.6%
lift-+.f64N/A
+-commutativeN/A
lift-*.f64N/A
*-commutativeN/A
lower-fma.f6498.6
Applied rewrites98.6%
Taylor expanded in y around inf
*-commutativeN/A
associate-*l/N/A
lower-*.f64N/A
lower-/.f6464.4
Applied rewrites64.4%
if -5.0000000000000002e-14 < (/.f64 z t) Initial program 97.7%
lift-+.f64N/A
+-commutativeN/A
lift-*.f64N/A
lift-/.f64N/A
clear-numN/A
associate-/r/N/A
associate-*r*N/A
*-commutativeN/A
lower-fma.f64N/A
associate-*l/N/A
*-lft-identityN/A
lower-/.f6493.1
Applied rewrites93.1%
Taylor expanded in y around inf
lower-/.f6483.4
Applied rewrites83.4%
Final simplification77.9%
(FPCore (x y z t) :precision binary64 (let* ((t_1 (- x (* (/ x t) z)))) (if (<= x -1e+26) t_1 (if (<= x 3.1e+86) (fma (/ y t) z x) t_1))))
double code(double x, double y, double z, double t) {
double t_1 = x - ((x / t) * z);
double tmp;
if (x <= -1e+26) {
tmp = t_1;
} else if (x <= 3.1e+86) {
tmp = fma((y / t), z, x);
} else {
tmp = t_1;
}
return tmp;
}
function code(x, y, z, t) t_1 = Float64(x - Float64(Float64(x / t) * z)) tmp = 0.0 if (x <= -1e+26) tmp = t_1; elseif (x <= 3.1e+86) tmp = fma(Float64(y / t), z, x); else tmp = t_1; end return tmp end
code[x_, y_, z_, t_] := Block[{t$95$1 = N[(x - N[(N[(x / t), $MachinePrecision] * z), $MachinePrecision]), $MachinePrecision]}, If[LessEqual[x, -1e+26], t$95$1, If[LessEqual[x, 3.1e+86], N[(N[(y / t), $MachinePrecision] * z + x), $MachinePrecision], t$95$1]]]
\begin{array}{l}
\\
\begin{array}{l}
t_1 := x - \frac{x}{t} \cdot z\\
\mathbf{if}\;x \leq -1 \cdot 10^{+26}:\\
\;\;\;\;t\_1\\
\mathbf{elif}\;x \leq 3.1 \cdot 10^{+86}:\\
\;\;\;\;\mathsf{fma}\left(\frac{y}{t}, z, x\right)\\
\mathbf{else}:\\
\;\;\;\;t\_1\\
\end{array}
\end{array}
if x < -1.00000000000000005e26 or 3.1000000000000002e86 < x Initial program 99.9%
Taylor expanded in y around 0
mul-1-negN/A
unsub-negN/A
lower--.f64N/A
associate-*l/N/A
lower-*.f64N/A
lower-/.f6489.0
Applied rewrites89.0%
if -1.00000000000000005e26 < x < 3.1000000000000002e86Initial program 96.9%
lift-+.f64N/A
+-commutativeN/A
lift-*.f64N/A
lift-/.f64N/A
clear-numN/A
associate-/r/N/A
associate-*r*N/A
*-commutativeN/A
lower-fma.f64N/A
associate-*l/N/A
*-lft-identityN/A
lower-/.f6490.7
Applied rewrites90.7%
Taylor expanded in y around inf
lower-/.f6483.2
Applied rewrites83.2%
(FPCore (x y z t) :precision binary64 (* y (/ z t)))
double code(double x, double y, double z, double t) {
return y * (z / t);
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = y * (z / t)
end function
public static double code(double x, double y, double z, double t) {
return y * (z / t);
}
def code(x, y, z, t): return y * (z / t)
function code(x, y, z, t) return Float64(y * Float64(z / t)) end
function tmp = code(x, y, z, t) tmp = y * (z / t); end
code[x_, y_, z_, t_] := N[(y * N[(z / t), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
y \cdot \frac{z}{t}
\end{array}
Initial program 98.0%
lift-+.f64N/A
+-commutativeN/A
lift-*.f64N/A
*-commutativeN/A
lower-fma.f6498.0
Applied rewrites98.0%
Taylor expanded in y around inf
*-commutativeN/A
associate-*l/N/A
lower-*.f64N/A
lower-/.f6445.1
Applied rewrites45.1%
Final simplification45.1%
(FPCore (x y z t) :precision binary64 (/ (* y z) t))
double code(double x, double y, double z, double t) {
return (y * z) / t;
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = (y * z) / t
end function
public static double code(double x, double y, double z, double t) {
return (y * z) / t;
}
def code(x, y, z, t): return (y * z) / t
function code(x, y, z, t) return Float64(Float64(y * z) / t) end
function tmp = code(x, y, z, t) tmp = (y * z) / t; end
code[x_, y_, z_, t_] := N[(N[(y * z), $MachinePrecision] / t), $MachinePrecision]
\begin{array}{l}
\\
\frac{y \cdot z}{t}
\end{array}
Initial program 98.0%
Taylor expanded in y around inf
associate-*l/N/A
lower-*.f64N/A
lower-/.f6440.1
Applied rewrites40.1%
Applied rewrites43.2%
(FPCore (x y z t) :precision binary64 (* (/ y t) z))
double code(double x, double y, double z, double t) {
return (y / t) * z;
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = (y / t) * z
end function
public static double code(double x, double y, double z, double t) {
return (y / t) * z;
}
def code(x, y, z, t): return (y / t) * z
function code(x, y, z, t) return Float64(Float64(y / t) * z) end
function tmp = code(x, y, z, t) tmp = (y / t) * z; end
code[x_, y_, z_, t_] := N[(N[(y / t), $MachinePrecision] * z), $MachinePrecision]
\begin{array}{l}
\\
\frac{y}{t} \cdot z
\end{array}
Initial program 98.0%
Taylor expanded in y around inf
associate-*l/N/A
lower-*.f64N/A
lower-/.f6440.1
Applied rewrites40.1%
(FPCore (x y z t)
:precision binary64
(let* ((t_1 (* (- y x) (/ z t))) (t_2 (+ x (/ (- y x) (/ t z)))))
(if (< t_1 -1013646692435.8867)
t_2
(if (< t_1 0.0) (+ x (/ (* (- y x) z) t)) t_2))))
double code(double x, double y, double z, double t) {
double t_1 = (y - x) * (z / t);
double t_2 = x + ((y - x) / (t / z));
double tmp;
if (t_1 < -1013646692435.8867) {
tmp = t_2;
} else if (t_1 < 0.0) {
tmp = x + (((y - x) * z) / t);
} else {
tmp = t_2;
}
return tmp;
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
real(8) :: t_1
real(8) :: t_2
real(8) :: tmp
t_1 = (y - x) * (z / t)
t_2 = x + ((y - x) / (t / z))
if (t_1 < (-1013646692435.8867d0)) then
tmp = t_2
else if (t_1 < 0.0d0) then
tmp = x + (((y - x) * z) / t)
else
tmp = t_2
end if
code = tmp
end function
public static double code(double x, double y, double z, double t) {
double t_1 = (y - x) * (z / t);
double t_2 = x + ((y - x) / (t / z));
double tmp;
if (t_1 < -1013646692435.8867) {
tmp = t_2;
} else if (t_1 < 0.0) {
tmp = x + (((y - x) * z) / t);
} else {
tmp = t_2;
}
return tmp;
}
def code(x, y, z, t): t_1 = (y - x) * (z / t) t_2 = x + ((y - x) / (t / z)) tmp = 0 if t_1 < -1013646692435.8867: tmp = t_2 elif t_1 < 0.0: tmp = x + (((y - x) * z) / t) else: tmp = t_2 return tmp
function code(x, y, z, t) t_1 = Float64(Float64(y - x) * Float64(z / t)) t_2 = Float64(x + Float64(Float64(y - x) / Float64(t / z))) tmp = 0.0 if (t_1 < -1013646692435.8867) tmp = t_2; elseif (t_1 < 0.0) tmp = Float64(x + Float64(Float64(Float64(y - x) * z) / t)); else tmp = t_2; end return tmp end
function tmp_2 = code(x, y, z, t) t_1 = (y - x) * (z / t); t_2 = x + ((y - x) / (t / z)); tmp = 0.0; if (t_1 < -1013646692435.8867) tmp = t_2; elseif (t_1 < 0.0) tmp = x + (((y - x) * z) / t); else tmp = t_2; end tmp_2 = tmp; end
code[x_, y_, z_, t_] := Block[{t$95$1 = N[(N[(y - x), $MachinePrecision] * N[(z / t), $MachinePrecision]), $MachinePrecision]}, Block[{t$95$2 = N[(x + N[(N[(y - x), $MachinePrecision] / N[(t / z), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]}, If[Less[t$95$1, -1013646692435.8867], t$95$2, If[Less[t$95$1, 0.0], N[(x + N[(N[(N[(y - x), $MachinePrecision] * z), $MachinePrecision] / t), $MachinePrecision]), $MachinePrecision], t$95$2]]]]
\begin{array}{l}
\\
\begin{array}{l}
t_1 := \left(y - x\right) \cdot \frac{z}{t}\\
t_2 := x + \frac{y - x}{\frac{t}{z}}\\
\mathbf{if}\;t\_1 < -1013646692435.8867:\\
\;\;\;\;t\_2\\
\mathbf{elif}\;t\_1 < 0:\\
\;\;\;\;x + \frac{\left(y - x\right) \cdot z}{t}\\
\mathbf{else}:\\
\;\;\;\;t\_2\\
\end{array}
\end{array}
herbie shell --seed 2024243
(FPCore (x y z t)
:name "Graphics.Rendering.Plot.Render.Plot.Axis:tickPosition from plot-0.2.3.4"
:precision binary64
:alt
(! :herbie-platform default (if (< (* (- y x) (/ z t)) -10136466924358867/10000) (+ x (/ (- y x) (/ t z))) (if (< (* (- y x) (/ z t)) 0) (+ x (/ (* (- y x) z) t)) (+ x (/ (- y x) (/ t z))))))
(+ x (* (- y x) (/ z t))))