Data Preparation
Make the two rulers agree
BOTIE
Examples, experiments and workspace controls
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.
Context for this challenge
The recorded heights are in centimetres. Build a reusable conversion into metres, using the same rule for each person.
The person stays the same when their height is written in metres. Botie needs a consistent unit conversion rather than a newly fitted reference.
Use the centimetres-per-metre constant as the divisor for the supplied height.
Examples and results
- Height (centimetres)
160
- Required result
1.6
- Height (centimetres)
175
- Required result
1.75
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
This is a small construction problem. The lesson explains the assumptions and the parts of the full method that this example leaves out. Numerical tests allow a difference of 0.001. Lists and structures must also have the right shape.
A fractional centimetre reading
This check uses the pieces from “Put every recorded height into metres”.
BOTIE
- Height (centimetres)
92.5
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.
What changes in this output and what stays physically identical? Why is the divisor independent of the training group?
Make measurement units explicit before interpreting coefficient sizes or distances.
This is a small construction problem. The lesson explains the assumptions and the parts of the full method that this example leaves out.
Work through the Python challenges →