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What does -XX:MaxPermSize do?
...eneration.
Permanent Generation: The Permanent Generation is where class files are kept. These are the result of compiled classes and JSP pages. If this space is full, it triggers a Full Garbage Collection. If the Full Garbage Collection cannot clean out old unreferenced classes and there is no ro...
Get average color of image via Javascript
... Canvas or SVG.
Actually, someone just managed to generate client-side PNG files using JavaScript, without canvas or SVG, using the data URI scheme.
Second: you might actually not need Canvas, SVG or any of the above at all.
If you only need to process images on the client side, without modifying t...
Google OAuth 2 authorization - Error: redirect_uri_mismatch
...set 'oauth2_redirect_uri' => 'postmessage' in the google API config.php file.
– user2998553
Jun 22 '14 at 18:50
4
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Using print statements only to debug
...worked with before, using formulae never seen before and dealing with huge files. All this made me write a lot of print statements to verify if it's all going right and identify the points of failure. But, generally, outputting so much information is not a good practice. How do I use the print stat...
How do I access the command history from IDLE?
...
You can always edit the file config-keys.cfg found under ~/.idlerc by default; look for the entry "history-previous" and set it to as below...
history-previous = <Key-Up>
Done.
...
Android set height and width of Custom view programmatically
...the layout where the graphView is placed. For example if in the XML layout file graphView is placed inside RelativeLayout, then you should use new RelativeLayout.LayoutParams(width, height)
– Vic
Feb 10 '19 at 14:51
...
What is the 
 character?
...
Oct Dec Hex Name
012 10 0A Line Feed
In the html file you can use Dec and Hex representation of charters
The Dec is represented with &#10;
The Hex is represented with &#x0A (or you can omit the leading zero &#xA)
There is a good converter at https://r12a.git...
Check number of arguments passed to a Bash script
...itional Expressions
Conditional Constructs
Pattern Matching
Word Splitting
Filename Expansion (prev. Pathname Expansion)
Simple Commands
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Difference between map, applymap and apply methods in Pandas
...'d probably use apply just for the sake of clarity.
series.apply(download_file_for_every_element)
Map can use not only a function, but also a dictionary or another series. Let's say you want to manipulate permutations.
Take
1 2 3 4 5
2 1 4 5 3
The square of this permutation is
1 2 3 4 5
1 2...
In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
... readonly_fields = ('url',)
I've adapted in this way:
# In the admin.py file
class ItemAdmin(admin.ModelAdmin):
...
def get_readonly_fields(self, request, obj=None):
if obj:
return ['url']
else:
return []
And it works fine. Now if you add an Item,...