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Make each of these arrays with one line of NumPy, and print its shape and its sum…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Make each of these arrays with one line of NumPy, and print its shape and its sum.
- The whole numbers from 1 to 10.
- The multiples of 5 from 0 to 100.
- 21 equally spaced numbers from 0 to 2.
- A table of sevens with 3 rows and 4 columns.
- Ten zeros.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Plan. arange stops before its stop number, so for 1 to 10 the stop is 11. For "exactly 21 numbers", use linspace, which includes both ends.
Check. The sum of 1 to 10 is 55. The multiples of 5 are . The 21 numbers from 0 to 2 are symmetric around 1, so their sum is . The table has sevens, so the sum is 84. The zeros sum to 0.
Answer: shapes (10,), (21,), (21,), (3, 4), (10,), with the sums 55, 1050, 21, 84 and 0.
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