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Display image as grayscale using matplotlib
...asarray(image)
plt.imshow(arr, cmap='gray', vmin=0, vmax=255)
plt.show()
If you want to display the inverse grayscale, switch the cmap to cmap='gray_r'.
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How to get all possible combinations of a list’s elements?
...t iterable.
Combinations are emitted in lexicographic sort order. So, if the
input iterable is sorted, the
combination tuples will be produced in
sorted order.
Since 2.6, batteries are included!
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Split string, convert ToList() in one line
...ers
.Split(',')
.Where(x => int.TryParse(x, out _))
.Select(int.Parse)
.ToList();
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How to remove not null constraint in sql server using query
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or you can do : alter table table_name modify column_name type(30) NULL. 30 being the size of your column type, example: varchar(30)
– nr5
Sep 19 '12 at 18:11
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Obscure a UITextField password
...uct your string by yourself. Take a look at this delegate method textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String)
– Fangming
Aug 1 '19 at 14:04
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How can I add comments in MySQL?
...or table 'accesslog'
--
CREATE TABLE accesslog (
aid int(10) NOT NULL auto_increment COMMENT 'unique ID for each access entry',
title varchar(255) default NULL COMMENT 'the title of the page being accessed',
path varchar(255) default NULL COMMENT 'the local path of teh page being accessed',
....
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Remove all special characters from a string in R?
...e unwanted characters. For the most easily readable code, you want the str_replace_all from the stringr package, though gsub from base R works just as well.
The exact regular expression depends upon what you are trying to do. You could just remove those specific characters that you gave in the qu...
nginx error “conflicting server name” ignored [closed]
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fixed the issue for me on Ubuntu 12.04 x86_64 + nginx
– Stephen Sprinkle
Jan 10 '13 at 5:16
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SQL WITH clause example [duplicate]
...of the SQL WITH clause when using a single sub-query alias.
WITH <alias_name> AS (sql_subquery_statement)
SELECT column_list FROM <alias_name>[,table_name]
[WHERE <join_condition>]
When using multiple sub-query aliases, the syntax is as follows.
WITH <alias_name_A> AS (sq...
Rename a table in MySQL
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The mysql query for rename table is
Rename Table old_name TO new_name
In your query, you've used group which one of the keywords in MySQL.
Try to avoid mysql keywords for name while creating table, field name and so on.
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