152 questions
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How to use numpy masked arrays to create a masked xarray DataArray?
I'm using metpy.calc.windchill in order to calculate wind chill values, and it automatically spits out an array with a numpy mask on it.
t2m, uwind, and vwind all come from ERA5 (on the Google Cloud: ...
0
votes
1
answer
58
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RuntimeWarning: invalid value encountered in double_scalars with function working in calculators
I have an equation that I try to run in python for a range of values:
T = 15
H = range(0, 100)
for hum in H:
ED = 0.942 * (hum ** 0.679) + 11 * exp((hum - 100) / 10) + 0.18 * (21.1 - T) ** (1 - exp(-...
- 61
1
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0
answers
91
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Numpy add.at not working with masked array
I'm trying to sum some numbers in a masked array using np.add.at as follows:
acc = np.ma.zeros((1,), dtype=np.float64)
arr = np.ma.masked_array([1.,2.,3.,4.,5.], mask=[0, 1, 0, 0, 0])
np.add.at(acc, [...
- 3,557
-2
votes
1
answer
29
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Why some data is missing on a figure when I define the axes? My dataset is a DataArray and some values are masked [duplicate]
I would like to be able to define my axis and not lose information. Currently, I am missing the last data point in both dimensions I defined (see figure).
DATA = xr.DataArray(np.random.rand(74,13),...
- 197
0
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0
answers
42
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Why does np.ma.median work for only certain sizes of nan matrices and give the MaskError('Cannot alter the masked element.') for other sizes
I am trying to build a code that can be given an matrix of nans and not break. I wrote a simplified version here that recreates the problem. I am using numpy version 1.23.5
Basically the code takes a ...
- 1
0
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0
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484
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Masked array from list of one-element masked arrays: Cannot convert masked element to a Python int
I want to create a 1d masked array from a list of one-element (0d) masked arrays using numpy.ma. This works as expected if the values are not masked, it does not in the other case:
import numpy.ma as ...
- 223
0
votes
1
answer
37
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Adding 3D masked arrays results in TypeError: 'numpy.bool_' object is not iterable
I have two 3D masked arrays (netCDF4 files output from climate model) that I want to add together. I followed this thread and got the following (simplified) code out of it:
import numpy as np
from ...
- 61
0
votes
0
answers
180
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correlation calculation of masked array:
I have a sea surface temperature time series, and I want to calculate the correlation coefficients among the nodes in the tropics(30.0N to 30S). In the time series, the land information is present as ...
- 51
3
votes
2
answers
350
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in numpy, what is the difference between calling MA.masked_where and MA.masked_array?
Calling masked_array (the class constructor) and the masked_where function both seem to do exactly the same thing, in terms of being able to construct a numpy masked array given the data and mask ...
- 13.2k
0
votes
1
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122
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problem with setting numpy's maskedarray fill_value
I cannot figure out how to set the fill_value of a real masked array to be np.nan. The array is the result of the calculation of two complex maskedarrays. Somehow, the calculated array's fill_value ...
- 45
0
votes
1
answer
488
views
How to solve numpy.ma.core.MaskError: Cannot alter the masked element?
I am new to python and I am trying to convert python 2 code I found on github (https://github.com/RDCEP/psims) into python 3. It went quite well, but now I am stuck with the following error message:
...
- 109
1
vote
0
answers
182
views
matplotlib.pyplot.scatter does not respect mask rules with datetime
matplotlib version 3.5.3
Plotting a numpy masked array against a list of datetime objects, plt.plot functions as expected, but plt.scatter still displays the masked data. Auto-axis limits do respect ...
- 107
0
votes
1
answer
223
views
How to apply a function element-wise with inputs from multiple numpy masked arrays to create a new masked array?
I have a function that takes in 4 single value inputs to return a singular float output, for example:
from scipy.stats import multivariate_normal
grid_step = 0.25 #in units of sigma
grid_x, grid_y = ...
0
votes
1
answer
345
views
Irregular/Inhomogeneous Arrays with JAX
What is the recommended approach to implement array behaviour/methods on irregular/inhomogeneous data (possesses some inherient dimensionality) within JAX?
Two principle options come to mind:
make ...
- 440
0
votes
1
answer
485
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How to implement masked array fitting using lmfit (prior using sigma option of curve_fit)
I am trying to implement masked-array fitting using lmfit.
Prior I was using curve_fit using the following code snippet. I have omitted the def spec due to its line length. Essentially def spec is ...
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