All Questions
527 questions
15
votes
1
answer
35k
views
Python color map but with all zero values mapped to black
I have a square array of elements which correspond to lattice sites. Some of the elements are zero and the rest vary between 1 and about 2700. Using imshow and the OrRd colour map, I want all lattice ...
- 839
3
votes
2
answers
4k
views
How do I create a 3D line plot in matplotlib from the data in arrays?
I have numerically solved the Lorenz equations using SciPy with the script:
# Lorenz Equations SciPy solver
import numpy as np
from scipy import integrate
from math import cos
from matplotlib import ...
- 3,745
1
vote
1
answer
46
views
Iteration of a graph approximation
The code below runs a model based on a graph generated by the solution to a system of differential equations and shows one with random 5% error added to the points. How would I iterate this process (...
- 1
1
vote
0
answers
41
views
How to plot only a certain area of data?
I am facing a problem that I can't solve. I have radar data, from which I want to plot the grid structure (rectangles) of a certain area. So far, I have the following:
#-- Get coordinates in the ...
- 57
46
votes
4
answers
135k
views
Overlay an image segmentation with numpy and matplotlib
I am trying to overlay two images. The first one is a 512x512 NumPy array (from a CT image). The second one is also a 512x512 NumPy array but I am just interested in the pixels where the value is ...
- 367
0
votes
1
answer
50
views
Is there a way to print a desired x and y value directly from a graph using arrays in python? I also need to have the x axis at y = 0
Current plot with markers
import numpy as np
import matplotlib.pyplot as plt
import math as mth
x = np.array([0.0012,0.0006,0.0004,0.0003,0.00024,0.0002])
y = np.array([-160,-35,-4.2,9.0,16.9,21.3])
...
- 925
1
vote
1
answer
283
views
Reading arrays from txt file in python to plot a graph
I'm new to python and want to plot a graph using data stored in arrays on a txt file...
content in the txt file ar just the arrays... nothing else.. exemple:
arrays.txt
[0, 1, 10, 5, 40, 1, 70] [12, ...
- 196k
0
votes
0
answers
38
views
Animation of an array with matplotlib library
I want to animate my array as a scatter plot, this is the shape of my data:
data = np.array([[[[1], [2], [7], [1]],
[[2], [4], [9], [1]]],
[[[5], [2], [8], [1]],
...
- 23
-1
votes
2
answers
245
views
How to reverse the slope of a graphed line
I'm trying to make a simple budget line graph that you would see in an economics class. But I need the slope of my line to be from 60 to 15 (inverse of what it is now).
I tried inversing the axis ...
- 9,223
-1
votes
1
answer
41
views
Splitting a large 3D array and plotting into colormap
I have some 3D structured array data and i want to process them into colormaps.
The array is very huge, and it looks like below when i print it.
[[[9.24908975e-05 9.24908975e-05 9.24908975e-05 ... 9....
- 62.7k
55
votes
1
answer
261k
views
TypeError: Invalid dimensions for image data when plotting array with imshow()
For the following code
# Numerical operation
SN_map_final = (new_SN_map - mean_SN) / sigma_SN
# Plot figure
fig12 = plt.figure(12)
fig_SN_final = plt.imshow(SN_map_final, interpolation='nearest')
...
2
votes
0
answers
29
views
How to convert a 3D plot into a 2D filled contour [duplicate]
I have a 3D plot that looks quite nice, and I'd like to convert this to a 2D filled contour plot, but I'm not quite sure how to do that. Here is my setup
import numpy as np
from mpl_toolkits.mplot3d ...
- 62.7k
2
votes
2
answers
625
views
Difference between plotting the same data from a csv file and from array?
I plotted data from CSV file and I converted the same CSV file into NumPy array and plotted the same data. However, I get different graphs, which is confusing and can someone help me if I have made a ...
- 757k
22
votes
5
answers
66k
views
how to save an array as a grayscale image with matplotlib/numpy?
I am trying to save a numpy array of dimensions 128x128 pixels into a grayscale image.
I simply thought that the pyplot.imsave function would do the job but it's not, it somehow converts my array into ...
- 1,145
0
votes
1
answer
102
views
How to assign scatter markers by dataframe column? How to avoid TypeError: unhashable type: 'Series' when creating string array from dataframe?
I'm trying to scatter plot data by year (column of dataframe) and assign marker type by detector used (column of dataframe). The following code generates the error 'TypeError: unhashable type: 'Series'...
