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Recommendations and Ranking

Rank the guide shelf

BOTIE

Add each column, then return guide indices in descending order.
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0 passed · 0 failed · 2 not run

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Examples, experiments and workspace controls
Live values

Connect a tool's inputs to see what it produces. You can try a branch before connecting it to Result.

Try your own inputs

Use a copy of the example to try your own data. Keep the problem's assumptions in mind, and predict the effect of a change before checking the output. You can also add another branch to compare two ways of doing the calculation.

Start at an output arrow, then click or drag to an input. Drag empty space to pan. Delete removes a selection. Ctrl/Cmd+Z undoes a change.
Context for this challenge

Add each column, then return guide indices in descending order.

Before knowing a reader's interests, Botie can rank the guide shelf using observed openings across readers.

Total each guide column, then return descending guide indices with catalogue order resolving ties.

Examples and results
Reader-by-guide interaction matrix
110
100
Required result
  1. 00
  2. 11
  3. 22
Reader-by-guide interaction matrix
011
010
Required result
  1. 01
  2. 12
  3. 20
Try a fresh construction

This clears this draft, including its undo history. Earlier successful attempts stay recorded. Build again without opening hints to record an independent attempt.

Stuck? Inspect a worked construction

The tools below form one possible solution. You can assemble it, follow its signals, and undo that change to return to your own construction.

Assumptions and test precision

Zero is unobserved interaction, not proof of dislike. Ties use catalogue order. Numerical tests allow a difference of 0.001. Lists and structures must also have the right shape.

A new guide has no readers yet

This check uses the pieces from “Keep guide counts separate while adding readers”.

BOTIE

Rows record three readers and columns record four guides. A 1 means the reader opened that guide. Rank all guides by total openings, returning zero-based column indices. Resolve equal totals in the original catalogue order, including the guide with no openings.
Reader-by-guide interaction matrix
0101
0100
1001

Use a number, text, or an array matching the requested result. For a matrix, put each row in brackets. Saving your prediction runs your current construction on these inputs and checks the earlier examples too.

Build a construction in the workspace above first. This case will test those pieces.

Does a zero entry mean a reader disliked that guide?

Unobserved interaction can reflect missing exposure, so popularity counts do not establish preference.

Zero is unobserved interaction, not proof of dislike. Ties use catalogue order.

Work through the Python challenges →
Continue the courseMatching a Reader’s Interests to Guide Descriptions →
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