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Unit 3 · Arrays with numpy

One type, one block of memory, and arithmetic that applies to everything at once.

  1. 1Why Arrays Beat ListsOne type and one block of memory buys arithmetic on the whole column.
  2. 2Creating Arrays and dtypesWhere an array comes from, and the type it settles on.
  3. 3Indexing and Slicing ArraysSlices look like list slices and behave differently in one important way.
  4. 4Boolean MasksA comparison over an array gives an array of answers, and that array selects.
  5. 5Array Maths and BroadcastingArrays of different shapes can still meet, under one clear rule.
  6. 6Summing and AxesIn two dimensions, the question is always which way you are collapsing.