All Questions
Tagged with matplotlib numpy
6,668 questions
0
votes
1
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51
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Value Error can only convert an array of size 1 to a Python scalar
I want to plot a heatmap centered around a value of 1 showing the expression of genes corresponding to cell lines using this as code:
import pandas as pd
import numpy as np
import matplotlib.pyplot as ...
- 21
2
votes
2
answers
54
views
How to save a matplotlib figure with automatic height to pdf
I have the following problem: I want to save a figure with a specific width, but auto-determine its height. Let's look at an example:
import matplotlib.pyplot as plt
import numpy as np
fig,ax=plt....
- 47
4
votes
2
answers
161
views
Is there a way to detect a hump in a linear data?
I have a set of x and y data. When plotted, the data is linear except for a particular section where the data deviates from a straight line, something like a hump. My target is to develop a procedure ...
- 41
0
votes
1
answer
77
views
Circular Import and Initialization Error when importing matplotlib with numpy
I have already attempted uninstalling and reinstalling matplotlib
I'm encountering the following errors when I attempt to import matplotlib
import numpy as np
import matplotlib
Returns:
ImportError: ...
0
votes
0
answers
45
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Implementation of the SIRD model in Python
I'm working on a project for my class where I'm trying to implement the SIRD model with the vaccinated population. I wrote my code based on my equations, but something seems wrong with my graph. The ...
- 1
3
votes
1
answer
133
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Accessing the end of of a file being written while live plotting of high speed datastream
My question refers to the great answer of the following question:
Real time data plotting from a high throughput source
As the gen.py code of this answer was growing fast, I wrote own version gen_own....
- 5,391
1
vote
2
answers
63
views
Gaps in a `matplotlib` plot of categorical data
When I have numerical data, say index by some kind of time, it is straightforward to plot gaps in the data. For instance, if I have values at times 1, 2, 3, 5, 6, 7, I can set an np.nan at time 4 to ...
- 346
-2
votes
1
answer
42
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How to limit vertical line range in negative number field
I drew a linear graph below y=0, and now I want the vertical lines x=0.52 and x=0.75 reach the graph, not crossing the whole xy field.
import numpy as np
import matplotlib.pyplot as plt
%matplotlib ...
- 7
1
vote
2
answers
50
views
How to control plot size whith different legend size matplotlib
I want to have 2 plots of the same size. The size of the figure is not as important.
The only change I am making is to the length of the labels.
(In reallity I have 2 related data sets )
A long label ...
- 657
0
votes
0
answers
46
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Numpy: What should I be considering when deciding where to put batch dimensions in my class functions to leverage vectorization?
I am writing some code using numpy that involves vectors, matrices, and functions from vectors to matrices. In particular, I am interested in running these functions over many vectors and many ...
- 53
0
votes
1
answer
68
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How do I turn-off this horizontal line in the FFT plot [duplicate]
I am trying to show the trend in observation data and the corresponding fft . A horizontal line keeps appearing in the fft, part that I do not need to show in the chart.
I give a MWE (pseudo data) ...
- 305
0
votes
2
answers
86
views
Installing Numpy, Pandas etc. packages on PyCharm Community
I am trying to install Pandas, Numpy, Matplotlib on PyCharm Community. However, it says you have to upgrade to PyCharm Pro to access these? So, can anybody please explain whether I have to get the ...
-2
votes
2
answers
65
views
MemoryError in creating large numpy array
My objective is to plot a histogram given values and counts. hist only takes an array of data as input. I have tried to recreat data using np.repeat, but this gives MemoryError: Unable to allocate 15....
- 781
0
votes
0
answers
59
views
Dividing polygon into almost even triangles via growth algorithm (Python)
I have this code thats taking in the vertices of a given polygon, calculating its area, dividing it by n. After that, it takes one point of the polygon and "draws" a triangle with 2 ...
- 1
0
votes
0
answers
31
views
Indent problem with Clicker in Matplotlib
I have taught myself enough Python/PyQt6/Qt Designer in Visual Studio Code to create a program that inverts a positive RGB image into a true negative. The program plots the positive inputs against the ...
0
votes
1
answer
63
views
fill_between plot fails on specific index value combo for a pands time-series
I try to do a plot and observe a strange error:
import pandas as pd
import matplotlib.pyplot as plt
idx = pd.TimedeltaIndex(['0 days 00:00:00', '0 days 06:00:00', '0 days 12:00:00', '0 days 18:00:00']...
- 304
0
votes
0
answers
47
views
SciPy Stats Library .fit() Command Issues Generating Fit With Imported File
I have an Excel file I have imported into a Pandas DataFrame. The file has four variables and we are supposed to run normality tests (Shapiro-Wilk, D'Agostino's, Anderson-Darling) for the data and ...
0
votes
1
answer
54
views
Slice list of 2D points for plotting with matplotlib
I've got a list of two-dimensional points represented in a numpy style array:
lines = np.array([
[[1,1], [2,3]], # line 1 (x,y) -> (x,y)
[[-1,1], [-2,2]], # line 2 (x,y) -> (x,y)
...
- 1,307
1
vote
1
answer
62
views
How can I plot printed data
I'm doing homework to generate a curved graph for my python course, and since it's my first time learning python, I have difficulties making an even simple code. I use Jupyter Handbook for my learning....
- 7
3
votes
2
answers
210
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Capturing Matplotlib coordinates with mouse clicks using ipywidgets in Jupyter Notebook
Short question
I want to capture coordinates by clicking different locations with a mouse on a Matplotlib figure inside a Jupyter Notebook. I want to use ipywidgets without using any Matplotlib magic ...
- 17.1k
0
votes
1
answer
65
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Gamma function fitting OptimizeWarning: Covariance of the parameters could not be estimated in Python
I am trying to fit functions to histograms using curve_fit from scipy, however a warning occurs when running the program:
import numpy as np
import matplotlib.pyplot as plt
from scipy.optimize import ...
3
votes
1
answer
46
views
Values over bars in barplot not centered
I have the following code, which produces a plot, that plots two dictionaries next to each other, where the y-axis are the days and the y-axis the relative costs. Since the plot is pretty bloated, i ...
0
votes
1
answer
446
views
Matplotlib's plt.show() throwing "ValueError: object __array__ method not producing an array"
I'm trying to run the following simple lines of Python code:
import numpy as np
import matplotlib.pyplot as plt
x = np.array([1, 2, 3])
y = np.array([4, 5, 6])
plt.plot(x, y)
plt.show()
But 'm ...
- 381
0
votes
0
answers
42
views
How to bold only e.g. the first, second, and second-to-last horizontal lines in a matplotlib table?
I'm working with matplotlib to create a table, and I need to bold specific horizontal lines.
Here's my current code:
np_table = table1(data)
fig, ax = plt.subplots(figsize=(6, 2.5))
ax.axis('off')
...
0
votes
1
answer
41
views
Python skimage: Turning grayscale image array into float makes the image use color instead of grayscale
When using the skimage.io module in python to read an image in grayscale, it works as intended. However, doing anything to the numpy array holding the values which results in them changing to float ...
0
votes
0
answers
37
views
I cannot animate the scatter plot in matplotlib. Every frame is the repeat of the first frame data plot
I am writing a python script to animate data from a list of .xyz files using matplotlib. However, the animation is actually static because each frame of the animation is displaying the data from the ...
- 101
0
votes
1
answer
52
views
How to fix "x and y must have same first dimension, but have shapes (192,) and (1,)" error?
I can't figure out why the shape of y is (1,). I thought since the return of my function is being calculated with the same thing I'm plotting on the x axis that they would have the same shape. Any ...
- 1
1
vote
0
answers
84
views
Can't import matplotlib in jupyter notebook
I have Python 3.9 in a virtual environment on my work PC. When I start the virtual environment with source ./python3.9_venv/bin/activate and then launch a python terminal with the command python3 , I ...
- 133
0
votes
0
answers
32
views
VSCode not resolving installed libraries [duplicate]
VSCode throws errors for both Matplotlib and numpy. Both are installed, I'm running the correct version of Python, and running the code in IDLE works fine. Python is not running virtual environment, ...
1
vote
0
answers
54
views
How to find the value of x given a y in Seaborn lineplot [duplicate]
As the title says, I want to obtain the value of x given a y in a Seaborn lineplot.
I have the following plot:
sns.lineplot(y=outlier_percent, x=np.linspace(0.001, 3, 50))
Where outlier_percent is ...
- 11
0
votes
1
answer
73
views
How to properly shear a line in a 2D image using interpolation in Python?
I'm trying to apply a shearing transformation to a simple 2D line filter (represented as a binary image) using interpolation methods in Python. However, the resulting image after applying the shear ...
- 459
-1
votes
1
answer
82
views
How to correctly extract white pixels from binary images and display them correctly on the plotlib?
This is a binary image, I want to calculate the distance between two edges of the pixel, then display it on a drawing board. I handle it when it does not have branches, but when it has branches like ...
- 3
0
votes
1
answer
81
views
Transfer numpy array coordinates to matplotlib coordinates
I do not know whether I'm doing a thinking mistake but I struggle a bit with the transfer from numpy array coordinates to matplotlib coordinates. As an example I underpin piece of sources of the ...
- 147
2
votes
1
answer
49
views
Exponential plot in python is a curve with multiple inflection points instead of exponential
I am trying to draw a simple exponential in python. When using the code below, everything works fine and the exponential is shown
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as ...
- 6,583
1
vote
1
answer
51
views
Plot annotations clipped by plt.savefig
I am plotting sunrise and sunset times using code adapted from the
matplotlib colormap examples
The code is below:
import datetime
import numpy as np
import matplotlib.pyplot as plt
# Define month/...
- 545
3
votes
1
answer
76
views
wordcloud with 2 background colors
I generated this on wordcloud.com using one of the "themes".
I'd like to be able to do this with the python wordcloud library, but so far all I can achieve is a single background color (so ...
- 692
0
votes
0
answers
119
views
Coefficients for inverse polynomial fit in Python
I am using SciPy's optimize.curve_fit to get polynomial coefficients for an implicit function, and that was successful. I now have y(x). I need x(y). If I instead do a curve_fit for y, x (as opposed ...
- 51
0
votes
2
answers
72
views
How to cplot() a conditional function
I want to plot this function defined on complex numbers: if floor(Re(z))%2==0, f(z)=z else f(z)=sin(z)
I tried to code this:
import cplot
import math
import numpy as np
def f(z):
if math.floor(np....
- 127
1
vote
1
answer
45
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 (...
- 115
0
votes
1
answer
67
views
Why am I seeing two lines within each subplot?
I am currently working on graphing a set of signals' Fourier Transforms. The issue that I am currently facing is that there seems to be a flat line in every single subplot, whose origins I am unsure ...
- 1
0
votes
1
answer
69
views
Change y axis scaling on a Seaborn Heatmap
I am at the final stage of displaying a heatmap within a facetgrid. When I am presenting the data, some of the index values may or may not be present for the row / column combination. I would like to ...
- 59
0
votes
1
answer
55
views
Plotting arrows of arctan2 argument over a map in Python
I plot a matrix 'diff' (quadratique sum of the input matrix diff_X and diff_Y) as a colored map using imshow and I would like to display arrows showing the corresponding angle arctan2(diff_Y/diff_X) ...
- 1
0
votes
0
answers
43
views
Calculating the ARE of parameters
I have the following code:
import numpy as np
import matplotlib.pyplot as plt
from scipy import integrate, optimize
import random
def dose(t, y, b, s, c, p, d):
target, infectious, virus = y
...
- 115
1
vote
2
answers
55
views
sharex and imshow do not produce plots of the same width
Context: I have the x,y and x,z projection of an image. I want the two images to be stacked vertically sharing the same width.
My trial: I tried the following:
import numpy as np
import matplotlib....
- 2,328
0
votes
1
answer
55
views
Computing and Visualizing Linear Trends in Ocean Temperature Data
I have a dataset containing ocean temperature values for the time period 1950-2022, covering the entire globe. My goal is to calculate the linear trend for each surface grid box and visualize the ...
- 21
0
votes
1
answer
88
views
Plot a path in a very large 2D matrix using Matplotlib
I want to plot a path in a very large (e.g. 500K x 500K) 2D matrix. My current approach is creating an uint8 np array (for space-saving reasons, as I only have 4 possible values) and plotting it with ...
- 21
0
votes
2
answers
264
views
Plotting a chirp square signal in python
Wikipedia definition: A chirp is a signal in which the frequency increases (up-chirp) or decreases (down-chirp) with time. In some sources, the term chirp is used interchangeably with sweep signal.
I ...
- 39
0
votes
1
answer
50
views
Three array scatter plot using Numpy and Matplotlib
import matplotlib.pyplot as plt
x =[24,73,94,8,26,80,89,23,7,50]
y =[52,98,48,39,50,84,76,96,76,9]
z=[14,56,79,21,42,67,5,55,27,91,10]
plt.scatter(x, y,z)
# To show the plot
plt.show()
I ...
0
votes
1
answer
45
views
Average of Sampled Data at Different Sampling Points
I need to plot the average of different trails of my sampled data y. The difficult part is that the corresponding sample points x do not coincide. However, x can only range from 0 to 1.
The following ...
- 143
0
votes
0
answers
44
views
Does the Intensity of color in OpenCV image matter?
Here is a simple code which puts a text value onto a black frame and displays it:
frame = np.zeros((50,200,3))
org=(0,45)
font=cv2.FONT_HERSHEY_SIMPLEX
fontScale=1
fontColor=(1,0,0) ##rgb
out_img =...
- 1,286