How do I get the terminal size in Julia?
Like the following code in Python:
import os
os.get_terminal_size()
You can use the displaysize function:
julia> displaysize(stdout)
(29, 134)
Related
Is there any way to obtain a Jupyter notebook's entire output history?
There are two objects in python In and Out objects.
That's how they work:
First wrote some code
import math
math.sin(2) #now, replacing with math.cos(3) and running again
It's Output:
0.9092974268256817 #when replaced with cos, O/P: -0.4161468365471424
Now to check input history:
In [4]: print(In)
['', 'import math', 'math.sin(2)', 'math.cos(2)', 'print(In)']
Now to check output history:
In [5]: Out
Out[5]: {2: 0.9092974268256817, 3: -0.4161468365471424}
Note: this will not get history when the notebook is closed and freshly started. It will work in the current session only.
Check this link for more explanation: https://jakevdp.github.io/PythonDataScienceHandbook/01.04-input-output-history.html
For example, you do something like this - In[1]: 1+2 you get Out[1]: 3.
So, you can do this in the next line :
In[2]: print(In[1])
And also for output
print(Out[1])
Check this - Output History
I'm trying to code Jarvis.
I'm having a problem with my audio output.
when I run the python script, it said that I don't have OS imported.
How would I solve this issue?
-Many Thanks
It seems like your Python script needs to import
the OS library
import os
Here's a few example lines you can use:
>>> import os
>>> statinfo = os.stat('somefile.txt')
>>> statinfo
os.stat_result(st_mode=33188, st_ino=7876932, st_dev=234881026,
st_nlink=1, st_uid=501, st_gid=501, st_size=264, st_atime=1297230295,
st_mtime=1297230027, st_ctime=1297230027)
>>> statinfo.st_size
264
enter code here
# -*- coding: utf-8 -*-
import math
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import matplotlib.animation as animation
fig1=plt.figure()
ax=plt.axes(xlim=(-10,10), ylim=(-10,10))
line,=ax.plot([],[],lw=1)
"""def init ():
line.set_data([],[])
return line,"""
dt=0.001
X=[]
Y=[]
r=float(input("Enter the radius :: "))
w=float(input("Enter angular frequency :: "))
def run(data):
t=0
while w*t<=2*math.pi:
x=r*math.cos(w*t)
y=r*math.sin(w*t)
X.append(x)
Y.append(y)
t=t+dt
line.set_data(X,Y)
return line,
line,=ax.plot(X,Y,lw=2)
FFMpegWriter = animation.writers['ffmpeg']
writer = FFMpegWriter(fps=15, metadata=dict(artist='Me'), bitrate=1800)
anim=animation.FuncAnimation(fig1,run,frames=200,interval=20,blit=True)
anim.save('amim.mp4',writer=writer)
The error message shown is ::
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/tathagata/anaconda3/lib/python3.4/site- packages/spyderlib/widgets/externalshell/sitecustomize.py", line 685, in runfile
execfile(filename, namespace)
File "/home/tathagata/anaconda3/lib/python3.4/site- packages/spyderlib/widgets/externalshell/sitecustomize.py", line 85, in execfile
exec(compile(open(filename, 'rb').read(), filename, 'exec'), namespace)
File "/home/tathagata/Documents/Python scripts/circleamim.py", line 35, in <module>
FFMpegWriter = animation.writers['ffmpeg']
File "/home/tathagata/anaconda3/lib/python3.4/site-packages/matplotlib/animation.py", line 81, in __getitem__
return self.avail[name]
KeyError: 'ffmpeg'
I use anacoda distribution and SPYDER as my IDE. I have seen the many solutions related to key errors. But the movie wont run. How can I make the movie to run? I hope there are no other logical errors.
First install ffmpeg and add path to ffmpeg
# on windows
plt.rcParams['animation.ffmpeg_path'] = 'C:\\ffmpeg\\bin\\ffmpeg.exe'
# on linux
plt.rcParams['animation.ffmpeg_path'] = u'/home/username/anaconda/envs/env_name/bin/ffmpeg'
Note for linux users: The path for ffmpeg can be found by simply using which: which ffmpeg
Also instead of
FFMpegWriter = animation.writers['ffmpeg']
writer = FFMpegWriter(fps=15, metadata=dict(artist='Me'), bitrate=1800)
I just used writer = animation.FFMpegWriter()
It seems that ffmpegis not installed on your system. Try the following code:
import matplotlib.animation as animation
print(animation.writers.list())
It will print out a list of all available MovieWriters. If ffmpegis not among it, you need to install it first from the ffmpeg homepage.
If you have Homebrew, literally just run the command
brew install ffmpeg
And Homebrew will take care of the rest (dependencies, etc). If you don't, I would recommend getting Homebrew or something like it (apt-get on Linux is built in, or an alternative on OS X would be Macports)
I have also posed with same problem(keyError: 'ffmpeg') but instead of using anakonda, I used IDLE3. So, first i checked for 'ffmpeg' in terminal it wasn't installed so installed it.
Using: sudo apt install ffmpeg
and when I run my save_animation program, it worked generating animation files in '.mpeg' format.
**How do I clear screen in julia-app mac OS-X **
In mac terminal - clear would clear the terminal screen.
How do I do the same in julia interactive app in Mac OS X?
Use keyboard shortcut: Ctrl + L.
Use Julia's REPL shell mode:
julia> ; # upon typing ;, the prompt changes (in place) to: shell>
shell> clear # unix
shell> cmd /c cls # windows
If you need a function you could use the run function:
julia> ? # upon typing ?, the prompt changes (in place) to: help>
help?> run
INFO: Loading help data...
Base.run(command)
Run a command object, constructed with backticks. Throws an error
if anything goes wrong, including the process exiting with a non-
zero status.
julia> using Compat: #static, is_unix # `Pkg.add("Compat")` if not installed.
julia> clear() = run(#static is_unix() ? `clear` : `cmd /c cls`)
clear (generic function with 1 method)
julia> clear()
This works in a platform and version independent way (tested in Windows and Linux, Julia versions 0.3.12, 0.4.5 and 0.5.+).
Try Ctrl+L if you want to clear the screen the interactive shell runs in. Same as bash.
A partial answer
Create a function clear() to print new line characters
clear() = for i in 1:20
print("\n")
end
Then invoke the function
clear()
I'm trying to use the rmagic extension for the IPython notebook, using Python 2.7.6 via Enthought Canopy.
When I try the following example:
import numpy as np
import pylab
X = np.array([0,1,2,3,4])
Y = np.array([3,5,4,6,7])
pylab.scatter(X, Y)
%Rpush X Y
%R lm(Y~X)$coef
I get an error:
AttributeError Traceback (most recent call last)
<ipython-input-7-96dff2c70ba0> in <module>()
1 get_ipython().magic(u'Rpush X Y')
----> 2 get_ipython().magic(u'R lm(Y~X)$coef')
…
/Users/hrob/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/IPython/extensions/rmagic.pyc in eval(self, line)
212 res = ro.r("withVisible({%s})" % line)
213 value = res[0] #value (R object)
--> 214 visible = ro.conversion.ri2py(res[1])[0] #visible (boolean)
215 except (ri.RRuntimeError, ValueError) as exception:
216 warning_or_other_msg = self.flush() # otherwise next return seems to have copy of error
AttributeError: 'module' object has no attribute 'ri2py'
I can't find anyone else who's had the same problem and don't know enough to solve it myself. There is no definition for ri2py in conversion.py though.
I initially had installed Anaconda and was running python notebook through that, with exactly the same results.
rpy2 (version 2.4.0) installed successfully but when I test it I get 1 expected failure as follows:
python -m 'rpy2.robjects.tests.__init__'
…
testNewWithTranslation (testFunction.SignatureTranslatedFunctionTestCase) ... expected failure
I don't know if that's related.
Can anyone suggest what the problem might be and how I might fix it? Are the versions of python, R, etc. that I'm using compatible or do I need to re-install/update something?
Are you using %load_ext rmagic?
If so, try using %load_ext rpy2.ipython instead.
This is one of the new features in version 2.4.0.