大约有 13,906 项符合查询结果（耗时：0.0189秒） [XML]
GCC dump preprocessor defines
...
Yes, use -E -dM options instead of -c.
Example (outputs them to stdout):
gcc -dM -E - < /dev/null
For C++
g++ -dM -E -x c++ - < /dev/null
From the gcc manual:
Instead of the normal output, generate
a list of `#define' directives for all
the ma...
image processing to improve tesseract OCR accuracy
I've been using tesseract to convert documents into text. The quality of the documents ranges wildly, and I'm looking for tips on what sort of image processing might improve the results. I've noticed that text that is highly pixellated - for example that generated by fax machines - is especially di...
How can I compare two lists in python and return matches
...
What would be the time complexity of the first example set(a) & set(b) ?
– AdjunctProfessorFalcon
May 19 '17 at 1:56
...
What's the false operator in C# good for?
...tors can't be overridden, but if you override |, &, true and false in exactly the right way the compiler will call | and & when you write || and &&.
For example, look at this code (from http://ayende.com/blog/1574/nhibernate-criteria-api-operator-overloading - where I found out abou...
How can I read command line parameters from an R script?
...
Dirk's answer here is everything you need. Here's a minimal reproducible example.
I made two files: exmpl.bat and exmpl.R.
exmpl.bat:
set R_Script="C:\Program Files\R-3.0.2\bin\RScript.exe"
%R_Script% exmpl.R 2010-01-28 example 100 > exmpl.batch 2>&1
Alternatively, using Rterm.exe:
...
Python append() vs. + operator on lists, why do these give different results?
...
To explain "why":
The + operation adds the array elements to the original array. The array.append operation inserts the array (or any object) into the end of the original array, which results in a reference to self in that spot (...
How do I execute a string containing Python code in Python?
How do I execute a string containing Python code in Python?
14 Answers
14
...
How to draw a line in android
Can anybody tell how to draw a line in Android, perhaps with an example?
15 Answers
1...
`levels
... it does allow assignment statements, using replacement functions:
levels(x) <- y
is equivalent to
x <- `levels<-`(x, y)
The trick is, this rewriting is done by <-; it is not done by levels<-. levels<- is just a regular function that takes an input and gives an output; it doe...
Can you create nested WITH clauses for Common Table Expressions?
...
While not strictly nested, you can use common table expressions to reuse previous queries in subsequent ones.
To do this, the form of the statement you are looking for would be
WITH x AS
(
SELECT * FROM MyTable
),
y AS
(
SELECT * FROM x
)
SELECT * FROM y
...