100 narray exercises

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Kozo Nishida edited this page Jun 4, 2016 · 40 revisions

This is narray version of 100 numpy exercises

Import the narray gem
```
require "numo/narray"
```

Create a null vector of size 10

p Numo::Int32.zeros(10)
p Numo::Float32.zeros(10)

Create a null vector of size 10 but the fifth value which is 1
```
Z = Numo::Int32.zeros(10)
Z[4] = 1
p Z
```
Create a vector with values ranging from 10 to 49
```
Z = Numo::Int32[10..49]
p Z
```
Reverse a vector (first element becomes last)
```
Z = Numo::Int32[0..49]
p Z.reverse
```
Create a 3x3 matrix with values ranging from 0 to 8
```
Z = Numo::Int32[0..8].reshape(3,3)
p Z
```