Questions tagged [elementwise-operations]
204 questions
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votes
1 answer
How to iterate a list of dictionaries and perform elementwise calculations with entries
I am trying to multiply entries of a list of dictionaries, see the example code below.
It generates TypeError: list indices must be integers or slices, not dict
How can this kind of operation be achieved?
list_of_uscases = [
{
"uscase": 1,
"power":…
MacUserXL
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- 5
-1
votes
1 answer
How to do dot products elementwise in numpy
Does anyone know of a way to do an elementwise dot product with numpy?
import numpy as np
a = np.array([ [0,0,0],[0,0,1] ])
b = np.array([ [1,2,3],[1,3,2] ])
for i in range(0, size(a)):
c.append(np.dot(a[i],b[i]))
and I want c = [0,2]
Also how…
phantom551
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-1
votes
1 answer
Element-wise comparison of numpy arrays of different lengths
I would like to compare numpy arrays of equal size in terms of greater/smaller relations. Specifically, I have
>>> import numpy as np
>>> A = np.array([0.5, 2., 0.1, 12.])
>>> B = np.ones(len(A))
>>> A
ProtonK
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-2
votes
1 answer
Element-wise addition of lists nested in two dictionaries (Python)
I have two dictionaries, and the value for every key is a list of two elements, something like this:
dict1 = {1234: [40.26, 4.87], 13564 [30.24, 41.74], 523545 [810.13, 237.94]}
dict2 = {1231: [43.26, 8.87], 13564 [904.71, 51.81], 52234 [811.13,…
mabusdogma
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-2
votes
1 answer
Octave error: horizontal dimensions mismatch - matrix elementwise matlab
k = linspace(0,0.5)'
h = 6.58212 * 10^-16
m_0 = 9.109383 * 10^-31
E_c = ( h^2 * k.^2 ) / ( 10^-5 * m_0 )
A = [E_c, 1, 2; 3, 4, 5; 6, 7, 8]
When I run this code, I get:
error: horizontal dimensions mismatch (100x1 vs 1x1)
error: called from
…
Joel
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-2
votes
2 answers
ValueError when defining a lambda function in python
I am receiving a ValueError when using integration, but I cannot understand why. Here is my simplified code:
import numpy as np
import scipy.integrate as integrate
pbar = 1
p = np.arange(0,pbar,pbar/1000)
h = lambda p: p**2/2+p*(1-p)
Kl = lambda p:…
splinter
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-3
votes
4 answers
Python : Vectorized comparison of two ordered numpy arrays of int of the same size
I want to compare two ordered numpy arrays of int of the same size in Python and output the common elements which are the same value at the same position :
import numpy as np
a = np.asarray([20, 35, 226, 62, 129, 108, 156, 225, 115, 35, 162, 43, 9,…
SebMa
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-4
votes
2 answers
element-wise comparison, matlab vs python numpy
I'm a Matlab user and I'm learning Python.
I want to create new arrays with element-wise comparison.
Using Matlab:
In the example I have solar radiation, temperature and relative…
scana
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-4
votes
1 answer
Elementwise Power in IT++
I was wondering if it was possible to do element wise power in it++. I have not seen a builtin function, and if I overlooked it. How can I achieve this?
Carnez Davis
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