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Alternative solution to exercise 4 #158

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4 changes: 2 additions & 2 deletions 100_Numpy_exercises_with_hints.md
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ File automatically generated. See the documentation to update questions/answers/
#### 3. Create a null vector of size 10 (★☆☆)
`hint: np.zeros`
#### 4. How to find the memory size of any array (★☆☆)
`hint: size, itemsize`
`hint: size, itemsize, nbytes`
#### 5. How to get the documentation of the numpy add function from the command line? (★☆☆)
`hint: np.info`
#### 6. Create a null vector of size 10 but the fifth value which is 1 (★☆☆)
Expand Down Expand Up @@ -247,4 +247,4 @@ np.sqrt(-1) == np.emath.sqrt(-1)
#### 99. Given an integer n and a 2D array X, select from X the rows which can be interpreted as draws from a multinomial distribution with n degrees, i.e., the rows which only contain integers and which sum to n. (★★★)
`hint: np.logical_and.reduce, np.mod`
#### 100. Compute bootstrapped 95% confidence intervals for the mean of a 1D array X (i.e., resample the elements of an array with replacement N times, compute the mean of each sample, and then compute percentiles over the means). (★★★)
`hint: np.percentile`
`hint: np.percentile`
6 changes: 3 additions & 3 deletions 100_Numpy_exercises_with_hints_with_solutions.md
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Expand Up @@ -33,11 +33,11 @@ Z = np.zeros(10)
print(Z)
```
#### 4. How to find the memory size of any array (★☆☆)
`hint: size, itemsize`
`hint: size, itemsize, nbytes`

```python
Z = np.zeros((10,10))
print("%d bytes" % (Z.size * Z.itemsize))
print("%d bytes (%d bytes, using "nbytes")" % ((Z.size * Z.itemsize), Z.nbytes))
```
#### 5. How to get the documentation of the numpy add function from the command line? (★☆☆)
`hint: np.info`
Expand Down Expand Up @@ -1205,4 +1205,4 @@ idx = np.random.randint(0, X.size, (N, X.size))
means = X[idx].mean(axis=1)
confint = np.percentile(means, [2.5, 97.5])
print(confint)
```
```
4 changes: 2 additions & 2 deletions 100_Numpy_exercises_with_solutions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ print(Z)

```python
Z = np.zeros((10,10))
print("%d bytes" % (Z.size * Z.itemsize))
print("%d bytes (%d bytes, using "nbytes")" % ((Z.size * Z.itemsize), Z.nbytes))
```
#### 5. How to get the documentation of the numpy add function from the command line? (★☆☆)

Expand Down Expand Up @@ -1205,4 +1205,4 @@ idx = np.random.randint(0, X.size, (N, X.size))
means = X[idx].mean(axis=1)
confint = np.percentile(means, [2.5, 97.5])
print(confint)
```
```