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Equation for testing if a point is inside a circle
... x, 2) + Math.Pow(center_y - y, 2))
return D <= radius
that's in C#...convert for use in python...
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Accessing inactive union member and undefined behavior?
...sion [conv.lval]
A glvalue of a non-function, non-array type T can be converted to a prvalue.
If T is an incomplete type, a program that necessitates this conversion is ill-formed. If the object to which the glvalue refers is not an object of type T and is not an object of a type derived from...
What is a “surrogate pair” in Java?
... does not support UTF-32
"????".equals("\u1F309") // false
3. You can convert Unicode character to Java String
"????".equals(new String(Character.toChars(0x0001F309))) //true
4. String.substring() does not consider supplementary characters
"????????".substring(0,1) //"?"
"????????".substri...
Algorithm to detect corners of paper sheet in photo
...p with after a bit of experimentation:
import cv, cv2, numpy as np
import sys
def get_new(old):
new = np.ones(old.shape, np.uint8)
cv2.bitwise_not(new,new)
return new
if __name__ == '__main__':
orig = cv2.imread(sys.argv[1])
# these constants are carefully picked
MORPH = ...
Remove unwanted parts from strings in a column
...2
3 11:00 44
4 12:00 30
5 13:00 110
If you need the result converted to an integer, you can use Series.astype,
df['result'] = df['result'].str.replace(r'\D', '').astype(int)
df.dtypes
time object
result int64
dtype: object
If you don't want to modify df in-place, use Dat...
How do I make my string comparison case insensitive?
...e best would be using s1.equalsIgnoreCase(s2): (see javadoc)
You can also convert them both to upper/lower case and use s1.equals(s2)
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How to display full (non-truncated) dataframe information in html when converting from pandas datafr
I converted a pandas dataframe to an html output using the DataFrame.to_html function. When I save this to a separate html file, the file shows truncated output.
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Is it safe to use -1 to set all bits to true?
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why is -1 guaranteed to be converted to all ones? Is that guaranteed by the standard?
– jalf
Apr 30 '09 at 22:11
9
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How to check if a database exists in SQL Server?
...char(128)
SET @dbname = N'Senna'
IF (EXISTS (SELECT name
FROM master.dbo.sysdatabases
WHERE ('[' + name + ']' = @dbname
OR name = @dbname)))
-- code mine :)
PRINT 'db exists'
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How to get UTC time in Python?
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What's the point of converting to a string and then back to a number when you can get the number directly?
– Mark Ransom
Mar 21 '17 at 18:09
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