aparler/RosettaCodeData
1
0
Fork 0
Code Issues 12 Pull requests 3 Projects Releases Packages Wiki Activity Actions

Data commit

Browse source
This commit is contained in:
Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
199093 changed files with 3378972 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

12
Task/Cumulative-standard-deviation/Nim/cumulative-standard-deviation-1.nim Normal file
View file

@ -0,0 +1,12 @@
import math, strutils
var sdSum, sdSum2, sdN = 0.0
proc sd(x: float): float =
sdN += 1
sdSum += x
sdSum2 += x * x
sqrt(sdSum2 / sdN - sdSum * sdSum / (sdN * sdN))
for value in [float 2,4,4,4,5,5,7,9]:
echo value, " ", formatFloat(sd(value), precision = -1)

16
Task/Cumulative-standard-deviation/Nim/cumulative-standard-deviation-2.nim Normal file
View file

@ -0,0 +1,16 @@
import math, strutils
type SDAccum = object
sdN, sdSum, sdSum2: float
var accum: SDAccum
proc add(accum: var SDAccum; value: float): float =
# Add a value to the accumulator. Return the standard deviation.
accum.sdN += 1
accum.sdSum += value
accum.sdSum2 += value * value
result = sqrt(accum.sdSum2 / accum.sdN - accum.sdSum * accum.sdSum / (accum.sdN * accum.sdN))
for value in [float 2, 4, 4, 4, 5, 5, 7, 9]:
echo value, " ", formatFloat(accum.add(value), precision = -1)

15
Task/Cumulative-standard-deviation/Nim/cumulative-standard-deviation-3.nim Normal file
View file

@ -0,0 +1,15 @@
import math, strutils
func accumBuilder(): auto =
var sdSum, sdSum2, sdN = 0.0
result = func(value: float): float =
sdN += 1
sdSum += value
sdSum2 += value * value
result = sqrt(sdSum2 / sdN - sdSum * sdSum / (sdN * sdN))
let std = accumBuilder()
for value in [float 2, 4, 4, 4, 5, 5, 7, 9]:
echo value, " ", formatFloat(std(value), precision = -1)