I have a .csv file which contains some data where x, y, x1, y1 are the coordinate points, and p is the value. My below code is working very well for plotting, but when I am plotting the data, I am getting a background color like the purple color. I don't want any color in the background. I want the background will be Transparent. My ultimate goal is overlying this result over an image. I am new in Python. Any help will be highly appreciated.
Download link of the .csv file here or link-2 or link-3
I am getting below result
My Code
import matplotlib.pyplot as plt
from scipy import ndimage
import numpy as np
import pandas as pd
from skimage import transform
from PIL import Image
import cv2
x_dim=1200
y_dim=1200
# Read CSV
df = pd.read_csv("flower_feature.csv")
# Create numpy array of zeros os same size
array = np.zeros((x_dim, y_dim), dtype=np.uint8)
for index, row in df.iterrows():
x = np.int(row["x"])
y = np.int(row["y"])
x1 = np.int(row["x1"])
y1 = np.int(row["y1"])
p = row["p"]
array[x:x1,y:y1] = p
map = ndimage.filters.gaussian_filter(array, sigma=16)
plt.imshow(map)
plt.show()
As per Ghassen's suggestion I am getting below results. I am still not getting the transparent background.
When Alpha =0
When alpha =0.5
When alpha =1
try with this code :
import matplotlib.pyplot as plt
from scipy import ndimage
import numpy as np
import pandas as pd
x_dim=1200
y_dim=1200
# Read CSV
df = pd.read_csv("/home/rosafi/Downloads/flower_feature.csv")
# Create numpy array of zeros os same size
array = np.ones((x_dim, y_dim), dtype=np.uint8)
for index, row in df.iterrows():
x = np.int(row["x"])
y = np.int(row["y"])
x1 = np.int(row["x1"])
y1 = np.int(row["y1"])
p = row["p"]
array[x:x1,y:y1] = p
map = ndimage.filters.gaussian_filter(array, sigma=16)
map = np.ma.masked_where(map == 0, map)
plt.imshow(map)
plt.show()
output:
I solved this issue by masking out the values where values ==0. The code will be
from mpl_toolkits.axes_grid1 import make_axes_locatable
masked_data = np.ma.masked_where(map == 0, map)
Related
I have working code that is utilizing dbscan to find tight groups of sparse spatial data imported with pd.read_csv.
I am maintaining the original spatial data locations and would like to annotate the labels returned by dbscan for each data point to the original dataframe and then write a csv with the same information.
So the code below is doing exactly what I would expect it to at this point, I would just like to extend it to import the label for each row in the original dataframe.
import argparse
import string
import os, subprocess
import pathlib
import glob
import gzip
import re
import time
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.patches as patches
from sklearn.cluster import DBSCAN
X = pd.read_csv(tmp_csv_name)
X = X.drop('Name', axis = 1)
X = X.drop('Type', axis = 1)
X = X.drop('SomeValue', axis = 1)
# only columns 'x' and 'y' now remain
db=DBSCAN(eps=EPS, min_samples=minSamples, metric='euclidean', algorithm='auto', leaf_size=30).fit(X)
labels = def_inst_dbsc.labels_
unique_labels = set(labels)
# maxX , maxY are manual inputs temporarily
while sizeX > 16 or sizeY > 16 :
sizeX=sizeX*0.8 ; sizeY=sizeY*0.8
fig, ax = plt.subplots(figsize=(sizeX,sizeY))
plt.xlim(0,maxX)
plt.ylim(0,maxY)
plt.scatter(X['x'], X['y'], c=colors, marker="o", picker=True)
# hackX , hackY are manual inputs temporarily
# which represent the boundaries defined in the original dataset
poly = patches.Polygon(xy=list(zip(hackX,hackY)), fill=False)
ax.add_patch(poly)
plt.show()
I want to divide and color points,val_lab(611,3) by their labels,pred_LAB(611,)
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
fig = plt.figure()
ax = plt.axes(projection = '3d')
ax.set_xlabel('L')
ax.set_ylabel('A')
ax.set_zlabel('B')
for i in range(0, len(val_lab)):
ax.scatter3D(
val_lab[i,0],
val_lab[i,1],
val_lab[i,2],
s = 8,
marker='o',
c = pred_LAB
#cmap = 'rainbow'
)
#ax.legend(*points.legend_elements(), title = 'clusters')
plt.show()
The problem is it shows error,
c' argument has 611 elements, which is not acceptable for use with 'x'
with size 1, 'y' with size 1.
However, if the dataset only have ten points,it can show the figure correctly, I don't know how to solve this problem, besides, how to add legend of this figure?
In your solution you would want to replace c = pred_LAB with c = pred_LAB[i]. But you do not have to use a for loop to plot the data. You can just use the following:
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
# generate random input data
val_lab = np.random.randint(0,10,(611,3))
pred_LAB = np.random.uniform(0,1, (611,))
# plot data
fig = plt.figure()
ax = plt.axes(projection = '3d')
ax.set_xlabel('L')
ax.set_ylabel('A')
ax.set_zlabel('B')
# create one 3D scatter plot - no for loop
ax.scatter3D(
val_lab[:,0],
val_lab[:,1],
val_lab[:,2],
s = 8,
marker='o',
c = pred_LAB,
cmap = 'rainbow',
label='my points'
)
# add legend
plt.legend()
plt.show()
I am trying to create a slider for time in Jupyter Notebook using ipywidgets. I would like to take the tabulated experimental data (see figure below) and control the value bounds with the help of a slider. The graph should be a force-displacement graph, evolving in time:
This is my python code:
from ipywidgets import IntSlider, interact, FloatSlider
u = fdat1['C_1_Weg_R4[mm]'].values
f = fdat1['C_1_Kraft_R4[kN]'].values
t = fdat1['S/No'].values
#interact(t = IntSlider(min = 0, max = max(fdat0['S/No'].values)))
def aa_(t):
plt.plot(f[t],u[t])
plt.grid()
plt.xlabel("force [kN]")
plt.ylabel("displacement [mm]")
plt.title("Load-displacement curve for \nexperiment")
fdat1 is the name of the tabulated data. I have also considered using "C_1_Zeit[s]" column as my slider values, but these are not integer values.
The problem is that nothing gets plotted, but the slider works and the graph changes scale.
I have been searching online for some time now and would really appreciate some help.
Thank you in advance!
Edit:
from ipywidgets import IntSlider, interact, FloatSlider
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
df = pd.DataFrame.from_records(
[np.linspace(0,30, num=30), np.linspace(0,20, num=30), ]).T
df.columns=['A', 'B']
#interact(t = IntSlider(min = 0, max = 21))
def aa_(t):
plt.scatter(df['A'], df['B'])
plt.grid()
plt.xlabel("force [kN]")
plt.ylabel("displacement [mm]")
plt.title("Load-displacement curve for \nexperiment")
plt.xlim(0, 30)
plt.ylim(0, 30)
Inside your plotting function, create a slice of your results dataframe that slices based on the slider value.
from ipywidgets import IntSlider, interact, FloatSlider
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
results = pd.DataFrame.from_records(
[np.linspace(0,30, num=30), np.linspace(0,20, num=30), ]).T
results.columns=['A', 'B']
#interact(t = IntSlider(min = 0, max = 21))
def aa_(t):
df = results.iloc[:t] # make the slice here
plt.scatter(df['A'], df['B'])
plt.grid()
plt.xlabel("force [kN]")
plt.ylabel("displacement [mm]")
plt.title("Load-displacement curve for \nexperiment")
plt.xlim(0, 30)
plt.ylim(0, 30)
So, basically, this should have been the correct code:
from ipywidgets import IntSlider, interact, FloatSlider
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
u = fdat1['C_1_Weg_R4[mm]'].values #loads displacement values from fdat1
f = fdat1['C_1_Kraft_R4[kN]'].values #loads force values from fdat1
df = pd.DataFrame.from_dict([u,f]).T #creates a dataframe
df.columns=['A', 'B']
#interact(t = IntSlider(min = 0, max = df.shape[0])) #interactive scatterplot with a slider for time
def scatterplot_(t):
plt.scatter(df.loc[0:t,'A'], df.loc[0:t,'B'])
plt.grid()
plt.xlabel("force [kN]")
plt.ylabel("displacement [mm]")
plt.title("Load-displacement curve for \nexperiment")
plt.xlim(-5, 5)
plt.ylim(-25, 25)
file contains values of echos w.r.t to lat/long, I have to plot complete range of echos over base map.
from netCDF4 import Dataset
import numpy as np
import pandas as pd
from google.colab import files
upload = files.upload()
my_example_nc_file = 'a.nc'
fh = Dataset(my_example_nc_file, mode='r')
lons = fh.variables['longitude'][:]
lats = fh.variables['latitude'][:]
ech= fh.variables['echos'][:]
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
%matplotlib inline
m = Basemap(width=5000000,height=3500000,
resolution='l',projection='stere',\
lat_ts=40,lat_0=lat_0,lon_0=lon_0)
xi, yi = m(lons, lats)
#simple plot
#m.plot(xi, yi, 'co')
m.scatter(rge,yi, marker = 'o', color='r', zorder=5)
Current code execute below results.
enter image description here
I want to plot total echos with variation represented by colors as presented in below screen short
enter image description here
I want to store the STFT spectrogram of the audio as image. The code below shows a spectrogram to me as output, but when saved as image I get a different image.
import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
audio_name = '---.au'
hop_length = 512
window_size = 1024
import librosa
y, sr = librosa.load(audio_name)
window = np.hanning(window_size)
out = librosa.core.spectrum.stft(y, n_fft = window_size, hop_length = hop_length,
window=window)
out = 2 * np.abs(out) / np.sum(window)
import librosa.display
librosa.display.specshow(librosa.amplitude_to_db(out,ref=np.max),
y_axis='log', x_axis='time')
from PIL import Image
img = Image.fromarray(out)
if img.mode != 'RGBA':
img = img.convert('RGBA')
img.save('output.png')
But when I save it the output file is a black image.
I want to save the exact image of the spectogrm.
If you want exactly what librosa.display.spectrogram() will show, then use matplotlib to save the plot to a file:
import matplotlib.pyplot as plt
import librosa.display
import numpy as np
import pandas as pd
import librosa
filename = librosa.util.example_audio_file()
y, sr = librosa.load(filename)
y = y[:100000] # shorten audio a bit for speed
window_size = 1024
window = np.hanning(window_size)
stft = librosa.core.spectrum.stft(y, n_fft=window_size, hop_length=512, window=window)
out = 2 * np.abs(stft) / np.sum(window)
# For plotting headlessly
from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
fig = plt.Figure()
canvas = FigureCanvas(fig)
ax = fig.add_subplot(111)
p = librosa.display.specshow(librosa.amplitude_to_db(out, ref=np.max), ax=ax, y_axis='log', x_axis='time')
fig.savefig('spec.png')
spec.png:
If the desired is to get just the data in the spectrogram, stored as an image, then see this answer.