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2025-04-09 14:23:04 +00:00
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100_Numpy_exercises_with_hints.md
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@@ -125,7 +125,7 @@ np.sqrt(-1) == np.emath.sqrt(-1)
`hint: sort`
#### 41. How to sum a small array faster than np.sum? (★★☆)
`hint: np.add.reduce`
#### 42. Consider two random array A and B, check if they are equal (★★☆)
#### 42. Consider two random arrays A and B, check if they are equal (★★☆)
`hint: np.allclose, np.array_equal`
#### 43. Make an array immutable (read-only) (★★☆)
`hint: flags.writeable`
@@ -137,7 +137,7 @@ np.sqrt(-1) == np.emath.sqrt(-1)
`hint: np.meshgrid`
#### 47. Given two arrays, X and Y, construct the Cauchy matrix C (Cij =1/(xi - yj)) (★★☆)
`hint: np.subtract.outer`
#### 48. Print the minimum and maximum representable value for each numpy scalar type (★★☆)
#### 48. Print the minimum and maximum representable values for each numpy scalar type (★★☆)
`hint: np.iinfo, np.finfo, eps`
#### 49. How to print all the values of an array? (★★☆)
`hint: np.set_printoptions`
@@ -147,7 +147,7 @@ np.sqrt(-1) == np.emath.sqrt(-1)
`hint: dtype`
#### 52. Consider a random vector with shape (100,2) representing coordinates, find point by point distances (★★☆)
`hint: np.atleast_2d, T, np.sqrt`
#### 53. How to convert a float (32 bits) array into an integer (32 bits) in place?
#### 53. How to convert a float (32 bits) array into an integer (32 bits) array in place?
`hint: view and [:] =`
#### 54. How to read the following file? (★★☆)
```
@@ -188,7 +188,7 @@ np.sqrt(-1) == np.emath.sqrt(-1)
`hint: np.diag`
#### 70. Consider the vector [1, 2, 3, 4, 5], how to build a new vector with 3 consecutive zeros interleaved between each value? (★★★)
`hint: array[::4]`
#### 71. Consider an array of dimension (5,5,3), how to mulitply it by an array with dimensions (5,5)? (★★★)
#### 71. Consider an array of dimension (5,5,3), how to multiply it by an array with dimensions (5,5)? (★★★)
`hint: array[:, :, None]`
#### 72. How to swap two rows of an array? (★★★)
`hint: array[[]] = array[[]]`
@@ -206,7 +206,7 @@ np.sqrt(-1) == np.emath.sqrt(-1)
`No hints provided...`
#### 79. Consider 2 sets of points P0,P1 describing lines (2d) and a set of points P, how to compute distance from each point j (P[j]) to each line i (P0[i],P1[i])? (★★★)
`No hints provided...`
#### 80. Consider an arbitrary array, write a function that extract a subpart with a fixed shape and centered on a given element (pad with a `fill` value when necessary) (★★★)
#### 80. Consider an arbitrary array, write a function that extracts a subpart with a fixed shape and centered on a given element (pad with a `fill` value when necessary) (★★★)
`hint: minimum maximum`
#### 81. Consider an array Z = [1,2,3,4,5,6,7,8,9,10,11,12,13,14], how to generate an array R = [[1,2,3,4], [2,3,4,5], [3,4,5,6], ..., [11,12,13,14]]? (★★★)
`hint: stride_tricks.as_strided, from numpy.lib.stride_tricks import sliding_window_view (np>=1.20.0)`
@@ -226,7 +226,7 @@ np.sqrt(-1) == np.emath.sqrt(-1)
`No hints provided...`
#### 89. How to get the n largest values of an array (★★★)
`hint: np.argsort | np.argpartition`
#### 90. Given an arbitrary number of vectors, build the cartesian product (every combinations of every item) (★★★)
#### 90. Given an arbitrary number of vectors, build the cartesian product (every combination of every item) (★★★)
`hint: np.indices`
#### 91. How to create a record array from a regular array? (★★★)
`hint: np.core.records.fromarrays`