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Undefined behavior and sequence points
...uence Points?
The Standard says
At certain specified points in the execution sequence called sequence points, all side effects of previous evaluations
shall be complete and no side effects of subsequent evaluations shall have taken place. (§1.9/7)
Side effects? What are side effects?
E...
How to check if variable is string with python 2 and 3 compatibility
I'm aware that I can use: isinstance(x, str) in python-3.x but I need to check if something is a string in python-2.x as well. Will isinstance(x, str) work as expected in python-2.x? Or will I need to check the version and use isinstance(x, basestr) ?
...
Union of dict objects in Python [duplicate]
...ne of the dicts as keyword arguments to the dict() constructor:
dict(y, **x)
Duplicates are resolved in favor of the value in x; for example
dict({'a' : 'y[a]'}, **{'a', 'x[a]'}) == {'a' : 'x[a]'}
share
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How can I represent an infinite number in Python?
...rt math
test = math.inf
And then:
test > 1
test > 10000
test > x
Will always be true. Unless of course, as pointed out, x is also infinity or "nan" ("not a number").
Additionally (Python 2.x ONLY), in a comparison to Ellipsis, float(inf) is lesser, e.g:
float('inf') < Ellipsis
w...
How can I remove all objects but one from the workspace in R?
...imple construct that will do it, by using setdiff:
rm(list=setdiff(ls(), "x"))
And a full example. Run this at your own risk - it will remove all variables except x:
x <- 1
y <- 2
z <- 3
ls()
[1] "x" "y" "z"
rm(list=setdiff(ls(), "x"))
ls()
[1] "x"
...
How to get all Errors from ASP.Net MVC modelState?
...tate entries with empty string for Value.ErrorMessage and instead a Value.Exception.Message
– AaronLS
Sep 16 '14 at 1:12
...
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...