大约有 13,922 项符合查询结果（耗时：0.0207秒） [XML]
List of lists into numpy array
... work. Instead there are at least 3 options:
1) Make an array of arrays:
x=[[1,2],[1,2,3],[1]]
y=numpy.array([numpy.array(xi) for xi in x])
type(y)
>>><type 'numpy.ndarray'>
type(y[0])
>>><type 'numpy.ndarray'>
2) Make an array of lists:
x=[[1,2],[1,2,3],[1]]
y=num...
change type of input field with jQuery
...ut field (with id="password" ) that is of type password to a normal text field, and then fill in the text “Password”.
...
Matplotlib scatterplot; colour as a function of a third variable
.....
import numpy as np
import matplotlib.pyplot as plt
# Generate data...
x = np.random.random(10)
y = np.random.random(10)
# Plot...
plt.scatter(x, y, c=y, s=500)
plt.gray()
plt.show()
Or, if you'd prefer a wider range of colormaps, you can also specify the cmap kwarg to scatter. To use the...
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...
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
...
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:
...
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...
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 (...
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...
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
...