大约有 41,800 项符合查询结果（耗时：0.0495秒） [XML]
Principal component analysis in Python
...
@Alex Fair enough. I think this is another variant of the XY problem - the OP said he didn't want an SVD-based solution because he thought SVD will be too slow, probably without having tried it yet. In cases like this I personally think it's more helpful to explain how you would tac...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...w. You can try f(x) = x^2 - 1/y, but it will be equally complicated: dx = 2xy / (y*x^2 - 1) for instance.
One non-obvious alternate choice for f(x) is: f(x) = y - 1/x^2
Then: dx = -f/f' = (y - 1/x^2) / (2/x^3) = 1/2 * x * (1 - y * x^2)
Ah! It's not a trivial expression, but you only have multiplie...
error: passing xxx as 'this' argument of xxx discards qualifiers
...ompile error as below(core message in my compiler):
error: passing 'const xy_stl::Count' as 'this' argument discards qualifiers [-fpermissive]
To solve the above problem, you can:
change the method uint32_t getCount(){...} to uint32_t getCount() const {...}. So count.getCount() won't change th...
How to check if a variable is a dictionary in Python?
...dard library/language constructs, etc.) The original question is itself an XY problem. Why does the OP need to check type? Because according to their code what they really want to do is to check whether an item in their collection behaves like a collection (implements items() that yields a nested it...
Why is this inline-block element pushed downward?
...uch to read and I am missing just those few lines where it says 'Solution: XY'
– Basic Coder
May 8 '16 at 15:03
...
Generate a heatmap in MatPlotLib using a scatter data set
...iliar with this type of plot, it's just a bivariate histogram in which the xy-plane is tessellated by a regular grid of hexagons.
So from a histogram, you can just count the number of points falling in each hexagon, discretiize the plotting region as a set of windows, assign each point to one of t...
Named colors in matplotlib
... ax.add_patch(patches.Rectangle(pos, w, h, color=c))
ax.annotate(c, xy=pos)
if y >= y_count-1:
x += 1
y = 0
else:
y += 1
plt.show()
share
|
improve this a...
What part of Hindley-Milner do you not understand?
...unction would be id = ∀x. λx. x. Now, we can obviously have an id2 = ∀xy. λx. x, where y is not used. Then id2 ⊑ id, which is what the [Inst] rule says.
– Ionuț G. Stan
Feb 19 '15 at 14:41
...
How does this giant regex work?
...kCRUjomNzxB2mz0P1KLDx0Jp5/2xKVrar6Y1HbG3Isb0f90JvFHa5CuHZC1u+iIgwnAZxbopnb9xyfJpNyMrn1Yd25rNDMspVkdYqz7shpyaF8lq0VyCeqFfIm8y9i0AqeNVTuclmo7VWuWcO+rFoXU6uy1m6Tjr7y3LZbwMFSmZutqJa1UsmU1lxWWvPBpRl5c4rbXFbc5ncUt6kXl6jbUQvpVPvVWaM6a1Znm1XR7kLhDsuigwq+6dz3K4OgP5/AmKhNhjWnxrXSzhaqh1huUndLoOjnougLuH4WhUpSKG...
Why does X[Y] join of data.tables not allow a full outer join, or a left join?
...login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f12773822%2fwhy-does-xy-join-of-data-tables-not-allow-a-full-outer-join-or-a-left-join%23new-answer', 'question_page');
}
);
Post as a guest
...