I am using the following line of code in my python application.
df['Close'].plot()
The figure produced by this code is very small on my high resolution display (Microsoft Surface Studio). I have looked at the documentation for the pandas plot command and matplotlib but have not found any relevant settings. Any help appreciated.
I would guess that you want to leave the figure size constant but change the dpi (dots per inch).
Somewhere on top of your script or notebook add
import matplotlib.pyplot as plt
plt.rcParams["figure.dpi"] = 144
Change 144 to your liking. (Note that multiples of 72 usually give nice lines).
The figsize parameter is what you're after.
df['Close'].plot(figsize=(20,10))
If you are in a Jupyter Notebook, there may be an issue where the notebook shrinks figures to fit in the cell output as .plot(figsize=x,y) increases the size. You will notice the text getting smaller but the plot seems to stay the same size, as you increase the figsize parameters.
Related
Here is a figured produced by Python Pandas + Matplotlib
The problem is obvious: The x-axis labels are too large relative to the overall figure size.
There are two ways to solve this:
Increase the overall figure size, keeping the label font size the same
Reduce the label font size while keeping the figure size the same
I am saving the output as pdf. I would ideally like to use the first option, as when I open this file on my computer, the actual screen rendered size is about 400 pixels wide, which isn't very large. But this may not be possile when saving as pdf?
The code relevant is just two lines. data_age created from a Pandas dataframe.
# data is a Panadas dataframe, one of the columns is `'age'`.
data_age = data['age'].value_counts().sort_index()
plot = data_age.plot.bar()
pplt.savefig('age.pdf')
I searched around to find a solution to what I would have assumed would be a commonly encountered problem. I then went and read the documentation for matplotlib. There was an option dpi but this doesn't seem to have any effect when writing to a pdf file - which isn't surprising since pdf isn't a rasterized format.
pplt is obtained from import matplotlib.pyplot as pplt.
You should use the ax keyword argument paired with a matplotlib figure. Usage is as follows:
# create a matplotlib figure and set figsize
my_wider_figure, my_ax = plt.subplots(figsize=(15,10))
data_age.plot.bar(ax=my_ax)
I was trying to create a bivariate scatterplot of each variable against every other that are in a dataframe, and I found sns.pairplot() was exactly what I needed.
However, no matter what I do (and I have tried all of the advice found in this question), the plots keep coming out too spread out, as well as in general too big. In the picture below, only the first two rows and four columns out of 12 variables display on my entire screen.
I have found out that my use of
%config InlineBackend.figure_format = 'svg'
to create non-blurry graphs on my high-ppi screen is partially at blame, as without it, I instead get this graph, which fits perfectly on my screen, but is now too small and I would prefer to scroll slightly around while having a bigger pic.
(note: the additional options below have no effect)
How can I make the grid of plots customizable in its overall size as well as spacing? As it stands, no options work, and one graphics backend (the default one) produces too small graphs, while the 'svg' backend produces too large ones.
EDIT: Editing sns.set(rc={'figure.figsize':(x,y)}) or the height/ aspect options improve nothing: the former produces no change, while the latter two change how big the individual plots are (with height=1 making them indecipherable), but the overall "grid" is still as bulky and overly large as before.
Essentially you are asking how to display the figure in its original size in a jupyter notebook.
That translates into how to add scrollbars if it exceeds the room it's given by the layout of the output cell.
I think for the horizontal direction this can be done as follows. However for the vertical direction this does not seem to work.
%matplotlib inline
# Cell2
from IPython.display import display, HTML
CSS = """div.output_area img {max-width:None !important;max-height: None !important";}"""
display(HTML('<style>{}</style>'.format(CSS)))
# Cell3
import matplotlib.pyplot as plt
fig, ax = plt.subplots(ncols=8, figsize=(20,10))
It seems that the figsize option only changes the ratio of the height to width. Atleast this is the case when using jupyter notebooks. Here is an example:
import matplotlib.pyplot as plt
%matplotlib inline
import numpy as np
plt.figure(figsize=(16,8))
plt.plot(np.arange(1,10),np.arange(1,10))
plt.show()
plt.figure(figsize=(24,6))
plt.plot(np.arange(1,10),np.arange(1,10))
plt.show()
I was hoping that figsize intended inches, not a relative ratio. How would you go about enforcing that in python/ jupyter notebooks.
If you use a large figsize, say figsize=(50, 5) you will notice that the lines, the labels, everything is incredibly thin and small with respect to a plot with normal size.
This happens because you are using widths that are not compatible with the width of the output cell
and the notebook just scales down the figure to make it fit in the output cell.
To have the behavior you asked for, you need a horizontal scrolling capability in the output cell. I don't know of a `nbextension` that can enable horizontal scrolling in output cells.
After a bit of experimenting, it looks like using the nbagg backend
%matplotlib nbagg
gives you a scrollable output cell, and an interactive one as well, inside the notebook and possibly it is what you want.
Addendum
I've found this issue on IPython's github, with a request for horizontal scrolling in output cell — as you can see it's dated 2012 and there is no followup of sort.
plt.gcf().set_size_inches(16, 8)
After change figsize the figure size do changed when the parameter in a certain range.In my condition,size not growing after size above (24,8).When it's still below the range the size do increase.It's base on your displayer dpi, you can set the dpi in figure but eventually it's rely on your hardware.
The figaspect is set by matplotlib.figure.figaspect
If you save figures to files use savefig,you will see the image size increase also.
In my current iPython, matplotlib plots are being displayed inline. I wanted a way to display images with specific pixel sizes, as I usually only work with pixels and I don't print anything out.
My screen PPI is 208, so I ran these 2 pieces of code:
plt.figure(figsize=(2000/float(208), 1000/float(208)), dpi=208)
# other code here...
plt.savefig('my_fig.png', dpi=208)
What I'm confused about is this: When I examine my_fig.png, it is in fact 2000 pixels by 1000 pixels, this is what I want. Also according to https://stackoverflow.com/a/7912007/582917 the DPI settings for rendering to the display device and rendering a file have different defaults. That's why I have to also add in dpi=208 to the plt.savefig function.
However the image rendered on the iPython notebook, which is in the browser, is much smaller. Using my browser ruler, it's roughly 600 by 300 pixels.
Using the same DPI for both functions, why is that the inline rendered image in iPython notebook is so small, while my saved image is at the correct resolution that I want?
Note that I'm running iPython in a Virtualbox (that is also headless), I'm not sure if this can cause any differences.
After a few trial and errors, in order to get close the correct size for inline rendering, the figure dpi needed to be 58. But even then the images generated inline do not match exactly with my specified pixel count. It's always +- 10 to 20 pixels.
This might be due to the fact that %matplotlib inline by default will pass bbox_inches='tight' to plt.figure(...).
Try the following,
After calling%matplotlib inline, do
%config InlineBackend.print_figure_kwargs = {'bbox_inches':None}
then create your plot. Here's what it did for me:
Before
After
How can I save Python plots at very high quality?
That is, when I keep zooming in on the object saved in a PDF file, why isn't there any blurring?
Also, what would be the best mode to save it in?
png, eps? Or some other? I can't do pdf, because there is a hidden number that happens that mess with Latexmk compilation.
If you are using Matplotlib and are trying to get good figures in a LaTeX document, save as an EPS. Specifically, try something like this after running the commands to plot the image:
plt.savefig('destination_path.eps', format='eps')
I have found that EPS files work best and the dpi parameter is what really makes them look good in a document.
To specify the orientation of the figure before saving, simply call the following before the plt.savefig call, but after creating the plot (assuming you have plotted using an axes with the name ax):
ax.view_init(elev=elevation_angle, azim=azimuthal_angle)
Where elevation_angle is a number (in degrees) specifying the polar angle (down from vertical z axis) and the azimuthal_angle specifies the azimuthal angle (around the z axis).
I find that it is easiest to determine these values by first plotting the image and then rotating it and watching the current values of the angles appear towards the bottom of the window just below the actual plot. Keep in mind that the x, y, z, positions appear by default, but they are replaced with the two angles when you start to click+drag+rotate the image.
Just to add my results, also using Matplotlib.
.eps made all my text bold and removed transparency. .svg gave me high-resolution pictures that actually looked like my graph.
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
# Do the plot code
fig.savefig('myimage.svg', format='svg', dpi=1200)
I used 1200 dpi because a lot of scientific journals require images in 1200 / 600 / 300 dpi, depending on what the image is of. Convert to desired dpi and format in GIMP or Inkscape.
Obviously the dpi doesn't matter since .svg are vector graphics and have "infinite resolution".
You can save to a figure that is 1920x1080 (or 1080p) using:
fig = plt.figure(figsize=(19.20,10.80))
You can also go much higher or lower. The above solutions work well for printing, but these days you want the created image to go into a PNG/JPG or appear in a wide screen format.
Okay, I found spencerlyon2's answer working. However, in case anybody would find himself/herself not knowing what to do with that one line, I had to do it this way:
beingsaved = plt.figure()
# Some scatter plots
plt.scatter(X_1_x, X_1_y)
plt.scatter(X_2_x, X_2_y)
beingsaved.savefig('destination_path.eps', format='eps', dpi=1000)
In case you are working with seaborn plots, instead of Matplotlib, you can save a .png image like this:
Let's suppose you have a matrix object (either Pandas or NumPy), and you want to take a heatmap:
import seaborn as sb
image = sb.heatmap(matrix) # This gets you the heatmap
image.figure.savefig("C:/Your/Path/ ... /your_image.png") # This saves it
This code is compatible with the latest version of Seaborn. Other code around Stack Overflow worked only for previous versions.
Another way I like is this. I set the size of the next image as follows:
plt.subplots(figsize=(15,15))
And then later I plot the output in the console, from which I can copy-paste it where I want. (Since Seaborn is built on top of Matplotlib, there will not be any problem.)