mariner-1

Your mission

Fill out with the smoothed velocity series, averaging each reading with its two neighbours.

today's brief

July 22, 1962. Mariner 1 lifts off for Venus, wanders off course, and the range safety officer blows it up 293 seconds in. The guidance equation was supposed to use a smoothed radar velocity, but the mark that meant smoothed was left out when the formula was transcribed into code. So the rocket steered on raw, jittery readings and chased the noise. Arthur C. Clarke called it the most expensive hyphen in history. Put the smoothing back.

See it in action

smooth(out, {100,0,0,0,100}, 5)

Expected result

100 33 0 33 100

Your checklist

For your own tracking. Tests grade your code.

v holds n readings, all non-negative, and out has room for n values.
out[i] is the average of v[i - 1], v[i] and v[i + 1], truncated.
The first and last readings have no neighbour on one side, so they are copied across unchanged.

More examples

smooth(out, {7,9}, 2)

Expected result

7 9

smooth(out, {5}, 1)

Expected result

Constraints

Expected files

smooth.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions

mariner-1

Your mission

Fill out with the smoothed velocity series, averaging each reading with its two neighbours.

today's brief

See it in action

smooth(out, {100,0,0,0,100}, 5)

Expected result

100 33 0 33 100

Your checklist

For your own tracking. Tests grade your code.

v holds n readings, all non-negative, and out has room for n values.
out[i] is the average of v[i - 1], v[i] and v[i + 1], truncated.
The first and last readings have no neighbour on one side, so they are copied across unchanged.

More examples

smooth(out, {7,9}, 2)

Expected result

7 9

smooth(out, {5}, 1)

Expected result

Constraints

Expected files

smooth.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions