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Make Verlet integration in Nim more idiomatic #782

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Merged
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Nov 11, 2020
Merged

Make Verlet integration in Nim more idiomatic #782

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29 changes: 15 additions & 14 deletions contents/verlet_integration/code/nim/verlet.nim
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
proc verlet(pos_in, acc, dt: float): float =
func verlet(pos_in, acc, dt: float): float =
var
pos: float = pos_in
prevPos: float = pos
Expand All @@ -11,9 +11,9 @@ proc verlet(pos_in, acc, dt: float): float =
pos = pos * 2 - prevPos + acc * dt * dt
prevPos = tempPos

return time
time

proc stormerVerlet(pos_in, acc, dt: float): (float, float) =
func stormerVerlet(pos_in, acc, dt: float): (float, float) =
var
pos: float = pos_in
prevPos: float = pos
Expand All @@ -29,9 +29,9 @@ proc stormerVerlet(pos_in, acc, dt: float): (float, float) =

vel += acc * dt

return (time, vel)
(time, vel)

proc velocityVerlet(pos_in, acc, dt: float): (float, float) =
func velocityVerlet(pos_in, acc, dt: float): (float, float) =
var
pos: float = pos_in
time: float = 0.0
Expand All @@ -42,15 +42,16 @@ proc velocityVerlet(pos_in, acc, dt: float): (float, float) =
pos += vel * dt + 0.5 * acc * dt * dt
vel += acc * dt

return (time, vel)
(time, vel)

let timeV = verlet(5.0, -10.0, 0.01)
echo "Time for Verlet integration is: ", timeV
when isMainModule:
let timeV = verlet(5.0, -10.0, 0.01)
echo "Time for Verlet integration is: ", timeV

let (timeSV, velSV) = stormerVerlet(5.0, -10.0, 0.01)
echo "Time for Stormer Verlet integration is: ", timeSV
echo "Velocity for Stormer Verlet integration is: ", velSV
let (timeSV, velSV) = stormerVerlet(5.0, -10.0, 0.01)
echo "Time for Stormer Verlet integration is: ", timeSV
echo "Velocity for Stormer Verlet integration is: ", velSV

let (timeVV, velVV) = velocityVerlet(5.0, -10.0, 0.01)
echo "Time for velocity Verlet integration is: ", timeVV
echo "Velocity for velocity Verlet integration is: ", velVV
let (timeVV, velVV) = velocityVerlet(5.0, -10.0, 0.01)
echo "Time for velocity Verlet integration is: ", timeVV
echo "Velocity for velocity Verlet integration is: ", velVV