Sum Scan Assignment

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Background

Prefix sum on Wikipedia

Code to Implement

file: src/main/sml/warmup_sum_scan/sum_scan.sml Smlnj-logo.png
functions: sum_scan

sum_scan

Write a function

fun sum_scan(xs : int list) : int list

which produces a list whose values are each the sum of values in xs up to and including the value at its location.

Example [1,2,3,4,5,6,7,8]

For example:

sum_scan([1,2,3,4,5,6,7,8])

would produce:

[1,3,6,10,15,21,28,36]
xs 1 2 3 4 5 6 7 8
sum_scan(xs) 1 3 6 10 15 21 28 36

Example [131,231,425]

For example:

sum_scan([131,231,425])

would produce:

[131, 362, 787]
xs 131 231 425
sum_scan(xs) 131 362 787


Test

file: unit_test_sum_scan.sml
source folder: src/test/sml/warmup_sum_scan