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Python: compare and insert a vector with an ordered numpy array
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30 pm US/Eastern)
Data science time! April 2019 and salary with experience
The Ask Question Wizard is Live!Traverse a list in reverse order in PythonDistance between numpy arrays, columnwiseVectorize over only one axis in a 2D array with numpy vectorizeVectorize Operations in Numpy for Two Dependent ArraysPythonic way to compare sign of numpy array with DataframeVector operations with numpyNumpy vectorized zero-order interpolationCreate a Large Numpy ArrayPossible to vectorize this array operation in python?Tile rows of a 2D numpy array based on values in separate numpy vector
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I have a numpy array whose rows is ordered and a vector. I need to insert this vector into the array if the value of the vector is smaller than some values of each array row. Furthermore, I need to get the index of the position. Can I use a vector like operation rather than two for loops?
For example, the i-th row of the array is [1,3,5,6], and the i-th value of vector is 4, the result is ([1,3,4,5], 2).
Here is the code example.
import random
import numpy as np
random.seed(0)
num_query = 2
topk = 3
distance = np.Inf * np.ones((num_query, topk))
print(distance)
for iter in range(4):
print('------------loop: :d------------'.format(iter))
dist = np.random.randn(num_query) / (0.3 * (iter+1))
dist = dist * np.sign(dist)
rows, columns = distance.shape
for row in range(rows):
d = dist[row]
if d > distance[row, columns - 1]:
continue
min_col = 0
for column in range(columns-1, -1, -1):
if distance[row, column] < d:
min_col = column + 1
break
distance[row, min_col + 1:] = distance[row, min_col:-1]
distance[row, min_col] = d
print(dist)
print(distance)
print('+++++++++++++++++++++++++++++++')
print(distance)
The output is:
[[inf inf inf]
[inf inf inf]]
------------loop: 0------------
[3.60155727 0.0991411 ]
[[3.60155727 inf inf]
[0.0991411 inf inf]]
+++++++++++++++++++++++++++++++
------------loop: 1------------
[1.4839764 1.99641269]
[[1.4839764 3.60155727 inf]
[0.0991411 1.99641269 inf]]
+++++++++++++++++++++++++++++++
------------loop: 2------------
[2.44132044 0.19221564]
[[1.4839764 2.44132044 3.60155727]
[0.0991411 0.19221564 1.99641269]]
+++++++++++++++++++++++++++++++
------------loop: 3------------
[0.29206705 1.17013653]
[[0.29206705 1.4839764 2.44132044]
[0.0991411 0.19221564 1.17013653]]
+++++++++++++++++++++++++++++++
[[0.29206705 1.4839764 2.44132044]
[0.0991411 0.19221564 1.17013653]]
python broadcast numpy-broadcasting
add a comment |
I have a numpy array whose rows is ordered and a vector. I need to insert this vector into the array if the value of the vector is smaller than some values of each array row. Furthermore, I need to get the index of the position. Can I use a vector like operation rather than two for loops?
For example, the i-th row of the array is [1,3,5,6], and the i-th value of vector is 4, the result is ([1,3,4,5], 2).
Here is the code example.
import random
import numpy as np
random.seed(0)
num_query = 2
topk = 3
distance = np.Inf * np.ones((num_query, topk))
print(distance)
for iter in range(4):
print('------------loop: :d------------'.format(iter))
dist = np.random.randn(num_query) / (0.3 * (iter+1))
dist = dist * np.sign(dist)
rows, columns = distance.shape
for row in range(rows):
d = dist[row]
if d > distance[row, columns - 1]:
continue
min_col = 0
for column in range(columns-1, -1, -1):
if distance[row, column] < d:
min_col = column + 1
break
distance[row, min_col + 1:] = distance[row, min_col:-1]
distance[row, min_col] = d
print(dist)
print(distance)
print('+++++++++++++++++++++++++++++++')
print(distance)
The output is:
[[inf inf inf]
[inf inf inf]]
------------loop: 0------------
[3.60155727 0.0991411 ]
[[3.60155727 inf inf]
[0.0991411 inf inf]]
+++++++++++++++++++++++++++++++
------------loop: 1------------
[1.4839764 1.99641269]
[[1.4839764 3.60155727 inf]
[0.0991411 1.99641269 inf]]
+++++++++++++++++++++++++++++++
------------loop: 2------------
[2.44132044 0.19221564]
[[1.4839764 2.44132044 3.60155727]
[0.0991411 0.19221564 1.99641269]]
+++++++++++++++++++++++++++++++
------------loop: 3------------
[0.29206705 1.17013653]
[[0.29206705 1.4839764 2.44132044]
[0.0991411 0.19221564 1.17013653]]
+++++++++++++++++++++++++++++++
[[0.29206705 1.4839764 2.44132044]
[0.0991411 0.19221564 1.17013653]]
python broadcast numpy-broadcasting
It looks like you hit the submit button before you finished writing your question, as is evident by there being nothing after "the output is:". If you have any additional information you'd like to include in this question, please edit and add all relevant details.
– Pikachu the Purple Wizard
Mar 9 at 5:00
@SupaMegaDuckyMomodaWaffle, thanks, it was an image. Now I edit it.
– Jiang QY.
Mar 9 at 13:28
add a comment |
I have a numpy array whose rows is ordered and a vector. I need to insert this vector into the array if the value of the vector is smaller than some values of each array row. Furthermore, I need to get the index of the position. Can I use a vector like operation rather than two for loops?
For example, the i-th row of the array is [1,3,5,6], and the i-th value of vector is 4, the result is ([1,3,4,5], 2).
Here is the code example.
import random
import numpy as np
random.seed(0)
num_query = 2
topk = 3
distance = np.Inf * np.ones((num_query, topk))
print(distance)
for iter in range(4):
print('------------loop: :d------------'.format(iter))
dist = np.random.randn(num_query) / (0.3 * (iter+1))
dist = dist * np.sign(dist)
rows, columns = distance.shape
for row in range(rows):
d = dist[row]
if d > distance[row, columns - 1]:
continue
min_col = 0
for column in range(columns-1, -1, -1):
if distance[row, column] < d:
min_col = column + 1
break
distance[row, min_col + 1:] = distance[row, min_col:-1]
distance[row, min_col] = d
print(dist)
print(distance)
print('+++++++++++++++++++++++++++++++')
print(distance)
The output is:
[[inf inf inf]
[inf inf inf]]
------------loop: 0------------
[3.60155727 0.0991411 ]
[[3.60155727 inf inf]
[0.0991411 inf inf]]
+++++++++++++++++++++++++++++++
------------loop: 1------------
[1.4839764 1.99641269]
[[1.4839764 3.60155727 inf]
[0.0991411 1.99641269 inf]]
+++++++++++++++++++++++++++++++
------------loop: 2------------
[2.44132044 0.19221564]
[[1.4839764 2.44132044 3.60155727]
[0.0991411 0.19221564 1.99641269]]
+++++++++++++++++++++++++++++++
------------loop: 3------------
[0.29206705 1.17013653]
[[0.29206705 1.4839764 2.44132044]
[0.0991411 0.19221564 1.17013653]]
+++++++++++++++++++++++++++++++
[[0.29206705 1.4839764 2.44132044]
[0.0991411 0.19221564 1.17013653]]
python broadcast numpy-broadcasting
I have a numpy array whose rows is ordered and a vector. I need to insert this vector into the array if the value of the vector is smaller than some values of each array row. Furthermore, I need to get the index of the position. Can I use a vector like operation rather than two for loops?
For example, the i-th row of the array is [1,3,5,6], and the i-th value of vector is 4, the result is ([1,3,4,5], 2).
Here is the code example.
import random
import numpy as np
random.seed(0)
num_query = 2
topk = 3
distance = np.Inf * np.ones((num_query, topk))
print(distance)
for iter in range(4):
print('------------loop: :d------------'.format(iter))
dist = np.random.randn(num_query) / (0.3 * (iter+1))
dist = dist * np.sign(dist)
rows, columns = distance.shape
for row in range(rows):
d = dist[row]
if d > distance[row, columns - 1]:
continue
min_col = 0
for column in range(columns-1, -1, -1):
if distance[row, column] < d:
min_col = column + 1
break
distance[row, min_col + 1:] = distance[row, min_col:-1]
distance[row, min_col] = d
print(dist)
print(distance)
print('+++++++++++++++++++++++++++++++')
print(distance)
The output is:
[[inf inf inf]
[inf inf inf]]
------------loop: 0------------
[3.60155727 0.0991411 ]
[[3.60155727 inf inf]
[0.0991411 inf inf]]
+++++++++++++++++++++++++++++++
------------loop: 1------------
[1.4839764 1.99641269]
[[1.4839764 3.60155727 inf]
[0.0991411 1.99641269 inf]]
+++++++++++++++++++++++++++++++
------------loop: 2------------
[2.44132044 0.19221564]
[[1.4839764 2.44132044 3.60155727]
[0.0991411 0.19221564 1.99641269]]
+++++++++++++++++++++++++++++++
------------loop: 3------------
[0.29206705 1.17013653]
[[0.29206705 1.4839764 2.44132044]
[0.0991411 0.19221564 1.17013653]]
+++++++++++++++++++++++++++++++
[[0.29206705 1.4839764 2.44132044]
[0.0991411 0.19221564 1.17013653]]
python broadcast numpy-broadcasting
python broadcast numpy-broadcasting
edited Mar 9 at 13:26
Jiang QY.
asked Mar 9 at 4:22
Jiang QY.Jiang QY.
62
62
It looks like you hit the submit button before you finished writing your question, as is evident by there being nothing after "the output is:". If you have any additional information you'd like to include in this question, please edit and add all relevant details.
– Pikachu the Purple Wizard
Mar 9 at 5:00
@SupaMegaDuckyMomodaWaffle, thanks, it was an image. Now I edit it.
– Jiang QY.
Mar 9 at 13:28
add a comment |
It looks like you hit the submit button before you finished writing your question, as is evident by there being nothing after "the output is:". If you have any additional information you'd like to include in this question, please edit and add all relevant details.
– Pikachu the Purple Wizard
Mar 9 at 5:00
@SupaMegaDuckyMomodaWaffle, thanks, it was an image. Now I edit it.
– Jiang QY.
Mar 9 at 13:28
It looks like you hit the submit button before you finished writing your question, as is evident by there being nothing after "the output is:". If you have any additional information you'd like to include in this question, please edit and add all relevant details.
– Pikachu the Purple Wizard
Mar 9 at 5:00
It looks like you hit the submit button before you finished writing your question, as is evident by there being nothing after "the output is:". If you have any additional information you'd like to include in this question, please edit and add all relevant details.
– Pikachu the Purple Wizard
Mar 9 at 5:00
@SupaMegaDuckyMomodaWaffle, thanks, it was an image. Now I edit it.
– Jiang QY.
Mar 9 at 13:28
@SupaMegaDuckyMomodaWaffle, thanks, it was an image. Now I edit it.
– Jiang QY.
Mar 9 at 13:28
add a comment |
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It looks like you hit the submit button before you finished writing your question, as is evident by there being nothing after "the output is:". If you have any additional information you'd like to include in this question, please edit and add all relevant details.
– Pikachu the Purple Wizard
Mar 9 at 5:00
@SupaMegaDuckyMomodaWaffle, thanks, it was an image. Now I edit it.
– Jiang QY.
Mar 9 at 13:28