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If strings are immutable in .NET, then why does Substring take O(n) time?
...nds of overlapping substrings with sizes in the hundred-thousand-character range, and those substrings lived a long time on the heap, then it would make perfect sense to go with a persistent substring approach; it would be wasteful and foolish not to. But most line-of-business programmers do not do ...
What is Hindley-Milner?
...S-expressions, in under 650 lines of C#
Note the implementation is in the range of only 270 or so lines of C# (for the algorithm W proper and the few data structures to support it, anyway).
Usage excerpt:
// ...
var syntax =
new SExpressionSyntax().
Include
(
...
Simple Digit Recognition OCR in OpenCV-Python
...OX_SIMPLE)
samples = np.empty((0,100))
responses = []
keys = [i for i in range(48,58)]
for cnt in contours:
if cv2.contourArea(cnt)>50:
[x,y,w,h] = cv2.boundingRect(cnt)
if h>28:
cv2.rectangle(im,(x,y),(x+w,y+h),(0,0,255),2)
roi = thresh[y:y+h,x...
When to use RDLC over RDL reports?
...ge reports, go with rdlc. Additionally, rdlc reports give you a very full range of control over your data, you may be able to save yourself wasted database trips, etc. by using client side reports. On the project I'm currently working on, a critical report requires about 2 minutes to render on the...
Rename specific column(s) in pandas
...name with axis=1
df = pd.DataFrame('x', columns=['y', 'gdp', 'cap'], index=range(5))
df
y gdp cap
0 x x x
1 x x x
2 x x x
3 x x x
4 x x x
With 0.21+, you can now specify an axis parameter with rename:
df.rename({'gdp':'log(gdp)'}, axis=1)
# df.rename({'gdp':'log(gdp)'},...
Do on-demand Mac OS X cloud services exist, comparable to Amazon's EC2 on-demand instances? [closed]
...width connection profiles, low, medium, high, optimized for some bandwidth ranges). I didn't test on the higher ones. Your mileage may vary.
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How can I know which parts in the code are never used?
...e)y will always be an integer (easy), and then understand the mathematical range of sqrt for the set of integers (hard). A very sophisticated compiler might be able to do this for the sqrt function, or for every function in math.h, or for any fixed-input function whose domain it can figure out. This...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
...However: "When sending a key to the handler for index_read() or records_in_range, we always use a 2-byte length for the VARCHAR to make things simpler." See forge.mysql.com/wiki/MySQL_Internals_MyISAM
– Bill Karwin
Feb 12 '11 at 18:56
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Why is list initialization (using curly braces) better than the alternatives?
...nt> c(it1,it2); //like filling the vector with 10 integers or copying a range.
vector<int> d{}; //empty braces -> default constructs vector, which is equivalent
//to a vector that is filled with zero elements
...
How can you program if you're blind?
...le can work as lawyers, journalists, teachers but a blind developer is a strange concept even for the blind. Many times I feel alone because some blind friends of mine can't understand my work.
You can read my opinion about this issue in this article, in Spanish, in my blog http://www.programaraci...