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Random sampling in numpy | ranf() function
• Last Updated : 26 Feb, 2019

`numpy.random.ranf()` is one of the function for doing random sampling in numpy. It returns an array of specified shape and fills it with random floats in the half-open interval `[0.0, 1.0).`

Syntax : numpy.random.ranf(size=None)

Parameters :
size : [int or tuple of ints, optional] Output shape. If the given shape is, e.g., (m, n, k), then m * n * k samples are drawn. Default is None, in which case a single value is returned.

Return : Array of random floats in the interval `[0.0, 1.0).` or a single such random float if size not provided.

Code #1 :

 `# Python program explaining ` `# numpy.random.ranf() function ` ` `  `# importing numpy ` `import` `numpy as geek ` ` `  ` `  `# output random float value ` `out_val ``=` `geek.random.ranf() ` `print` `(``"Output random float value : "``, out_val)  `

Output :

```Output random float value :  0.0877051588430926
```

Code #2 :

 `# Python program explaining ` `# numpy.random.ranf() function ` ` `  `# importing numpy ` `import` `numpy as geek ` ` `  ` `  `# output array ` `out_arr ``=` `geek.random.ranf(size ``=``(``2``, ``1``)) ` `print` `(``"Output 2D Array filled with random floats : "``, out_arr)  `

Output :

```Output 2D Array filled with random floats :  [[ 0.14186407]
[ 0.58068259]]
```

Code #3 :

 `# Python program explaining ` `# numpy.random.ranf() function ` ` `  `# importing numpy ` `import` `numpy as geek ` ` `  `# output array ` `out_arr ``=` `geek.random.ranf((``3``, ``3``, ``2``)) ` `print` `(``"Output 3D Array filled with random floats : "``, out_arr)  `

Output :

```Output 3D Array filled with random floats :  [[[ 0.11013584  0.67844746]
[ 0.84691569  0.09467084]
[ 0.69918864  0.12137178]]

[[ 0.30629051  0.28301093]
[ 0.1302665   0.2196221 ]
[ 0.51555358  0.73191852]]

[[ 0.72806359  0.66485275]
[ 0.80654791  0.04947181]
[ 0.06380535  0.99306064]]]

```

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