On Sat, Jun 28, 2025 at 8:42 AM Kwaku Oppong via NumPy-Discussion <
numpy-discussion@python.org> wrote:
> can someone helps me. Whenever i ytried to launch Jupyter from Navigator,
> this is the message I gets
>
Sorry, this isn't the place for Jupyter questio
s(c, a) / (a**2).sum()
> Out[135]: array([-0.93244529, 0.74775365, 1.09117371])
>
Delightful!
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https
print(res)
...
[-2.22044605e-16 0.e+00 -1.66533454e-16]
[7.56339436e-16 8.88178420e-16 2.77555756e-16]
[-5.55111512e-17 -2.77555756e-16 -2.22044605e-16]
[-1.66533454e-16 -5.55111512e-17 0.e+00]
[0.e+00 6.66133815e-16 3.33066907e-16]
[-1.11022302e-16 0.0
ike an ad hoc algorithm rather than a well-known, well-studied
random process. I'm happy to be corrected with references to the
literature, but even if there are references, I'm happy to leave this for
users to implement on their own.
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_
ort into it, but I think the
first step would be to walk through what the stride tricks actually would
be to get this operation to work. Then we can talk about whether or not
it's desirable to plug it in.
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one of the arrangements than others (e.g. the ravelled
will likely be the least convenient), but it has more to do with other code
and file formats that you are interacting with that will be the largest
factors in breaking the symmetry.
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ing polygons onto images, I might follow
scikit-image's convention instead.
By and large, you can usually safely follow whatever is your personal
preference without fearing that you are missing out on something vital.
What makes these convention
g
any that do implement these functions (the exception being the cotangent in
degrees, which Cephes implements, and we already expose in scipy.special).
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py/pull/5749/files
>>> original_oindex = OrthogonalIndexer(original)
>>> original_oindex[i, j, k]
array([[1237, 1241, 1243],
[1267, 1271, 1273],
[1297, 1301, 1303],
[1327, 1331, 1333],
[1357, 1361, 1363]])
Note that some other array implementations li
is suggesting that behavior should change. The issue is whether or
not an unnecessary, _additional_ copy gets made when converting a
not-exactly-an-`ndarray` object to an `ndarray` object before doing the
assignment (which always copies values over to the destination array).
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ich is primarily for 2D arrays (and presumably
following a convention from another language like MATLAB). In order to get
the (2, 3, 4) arrays that you want, use `indexing='ij'`
# Note the flipped order of inputs and outputs since you want the `zt`
values across the fi
turn dict(bg_state=bg_state, seed_seq=ss_dict)
def rng_fromdict(d):
bg_state = d['bg_state']
ss = np.random.SeedSequence(**d['seed_seq'])
bg = getattr(np.random, bg_state['bit_generator'])(ss)
bg.state = bg_state
rng = np.random.Generator(bg)
program code. NEP 19 doesn't need an update for us to endorse SPEC
7 (whether it needs one, separately, to clarify its intent is another
question).
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se and leave the 0-length-axis case
alone.
3. Fix the 0-length-axis case to use the following `# shape=...` comment
too.
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tor
>
>>> rng = np.random.default_rng()
>>> rng.bit_generator.seed_seq
SeedSequence(
entropy=186013007116029215180532390504704448637,
)
In some older versions of numpy, the attribute was semi-private as
_seed_seq, if you're still using one of those.
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__
lues to "func". The result
> value at position (1,1,1) in the output array would be y = func(X). The
> same would apply for all entries excluding the padding area (or according
> to some padding policy).
>
scipy.ndimage.generic_filter()
<https://docs.scipy.org/doc/scipy/reference
ely
desired, so it can be rarely requested in an explicit manner.
For `np.heaviside()`, a default value was intentionally left unspecified
because of the multiple conventions that people want. In the face of
ambiguity, refuse the temptation to guess.
I think we're comfortable with these cho
ainers). If it gets picked up by a bunch of other
array implementations, then you can make a proposal to have them added to
the Array API standard. numpy probably won't add them unless if that
happens first.
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oing the type inference yourself and implement that in the
`PyObjectArray.__array__()` implementation and avoid implementing
`__array_interface__` for that object. Then `np.asarray()` will just
delegate to `PyObjectArray.__array__()`.
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On Tue, Mar 26, 2024 at 3:39 PM Luca Bertolotti
wrote:
> Thanks for your reply yes it seems more appropriate a cubic spline but how
> can i get what they call SC
>
I don't think any of us has enough context to know what "SC" is. It's not a
standard term that I
ure JSON. Consider looking at
BJData, but it's "JSON-based" and not quite pure JSON.
https://neurojson.org/
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t from
an array to a reasonable JSONable encoding (e.g. base64). The time you are
seeing is the time it takes to encode that amount of data, period. That
said, if you want to use a quite inefficient hex encoding, `a.data.hex()`
is somewhat faster than the ba
vor of functions. A general way to add some kind of fluency cheaply in
an Array API-agnostic fashion might be helpful to people trying to make
their numpy-only code that uses our current set of methods in this way a
bit easier. But you'll have to make the proposal to them, I thi
ually sorted to).
Either way, we probably aren't going to add this as its own function. Both
options are straightforward combinations of existing primitives.
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rwise difficult to
> work with since it compares equal to 0.0. I would find it surprising
> for copysign to do a numeric calculation on complex numbers. Also,
> your suggested definition would be wrong for 0.0 and -0.0, since
> sign(0) is 0, and this is precis
ng of
the assertion of correctness (`random()`, as used in that StackOverflow
demonstration, does *not* exercise a lot of the important edge cases in the
floating point format). But if your true concern is that 9% of disk space,
you probably don't want to be using `savetxt()` in any case.
-
subarrays
<https://numpy.org/doc/stable/reference/arrays.dtypes.html#index-7> (e.g.
`np.dtype((np.int32, (2,2)))`), that info here.
3. If there are fields, a tuple of the names of the fields
4. If there are fields, the field descriptor dict.
5. If extended dtype (e.g. fields, strings, void, etc.
et()
while len(seen) < size:
dsize = size - len(seen)
seen.update(map(tuple, rng.integers(0, ashape, size=(dsize,
len(shape)
return list(seen)
That optimistic optimization makes this the fastest solution.
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just
doing set-checking anyways, so no loss.
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On Fri, Nov 17, 2023 at 4:15 PM Aaron Meurer wrote:
> On Fri, Nov 17, 2023 at 12:10 PM Robert Kern
> wrote:
> >
> > If the arrays you are drawing indices for are real in-memory arrays for
> present-day 64-bit computers, this should be adequate. If it's a notional
&g
integer
sampling. The builtin `random.randrange()` will do arbitrary-sized integers
and is quite reasonable for this task. If you want it to use our
BitGenerators underneath for clean PRNG state management, this is quite
doable with a simple subclass of `random.Random`:
https://github.com/num
it this
problem. I.e. if you use pickling, you're told to use it only for transient
data with the same versions of libraries on both ends of the pipe, but the
reality is that it's too useful to avoid in creating files with arbitrarily
long lives. Not their fault; they warned us!
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e the rest of the information in `__array_interface__`, and I think
you should be good to go. I don't think you'll need to infer or represent
the precise path of Python-level operations (slices, transposes, reshapes,
etc.) to which it got to that point.
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f a plain function like `fix()` and has a (strict, I believe)
superset of functionality. You can ignore `fix()`, more or less. I'm not
sure if it's on the list for deprecation/removal in numpy 2.0, but it
certainly could be.
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_
ave it at that and not extend the `Generator`
interface.
https://github.com/numpy/numpy/issues/24458#issuecomment-1685022258
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21])
> ```
> which matches your example in the cumsum0() documentation. Did something
> change in a recent release?
>
That's not what's in his example.
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iding such an `out=`) will fall down
to the `ff->f` loop and cause upcasting of the operands, which is not what
they want. But notionally one could add an `ee->f` loop between those two
that would catch this case when `dtype=np.float32` is requested.
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otion scheme.
`np.dot()` is kind of an oddball already, and "half-precision inputs ->
full-precision outputs" might be a worthwhile use case given hardware
accelerators. Given that this largely affects non-numpy implementations of
the Array API, you probably want to raise it with that group.
]
|21> x = np.arange(2*3).reshape((2, 3))
[~]
|22> x
array([[0, 1, 2],
[3, 4, 5]])
[~]
|23> x.flat[[0, 1, 2, 3]]
array([0, 1, 2, 3])
```
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rticularly
special values at places in between adjacent representable floating point
numbers.
> I'm ambivalent about reverting. I know I would love speed improvements
> because transformation calculations in GIS is slow using numpy, but also
> some coordinate transformations might break
On Wed, May 31, 2023 at 5:01 PM David Menéndez Hurtado <
davidmen...@gmail.com> wrote:
> On Wed, 31 May 2023, 22:41 Robert Kern, wrote:
>
>> Not sure anyone really uses tanh for serious work.
>>
>
> At the risk of derailing the discussion, the case I can think of
n trig functions because of their role in ML and
statistics (I'd still *prefer* to opt in, though). They don't have many
special values (which usually have alternates like expm1 and log1p to get
better precision in any case). But for trig functions, I'm much
On Wed, May 31, 2023 at 10:40 AM Ralf Gommers
wrote:
>
>
> On Wed, May 31, 2023 at 4:19 PM Charles R Harris <
> charlesr.har...@gmail.com> wrote:
>
>>
>>
>> On Wed, May 31, 2023 at 8:05 AM Robert Kern
>> wrote:
>>
>>> I w
rs,
>
> Sebastian
>
>
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case ("start", "exact"):
> result = np.arange(start, stop + step, step)
> result[-1] = stop
> return result
> case ("stop", "open"):
> return np.flip(np.arange(stop, start, -step))
>
/gcc/Integer-Overflow-Builtins.html
https://github.com/pytorch/pytorch/blob/main/c10/util/safe_numerics.h
https://github.com/dcleblanc/SafeInt
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a positive use case for this behavior,
or were they just reflecting NumPy's behavior?
AFAICR, the main reasoning on our side was that there was an unambiguous
value that we _could_ return, so we might as well. And in our later
experience, it was more trouble than i
case, and that looks a little
ugly, but overall it's less cognitive load on the user to just reuse the
common convention of broadcasting than to record the special case.
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s embedded in it. But it's absolutely a free choice for you to
precondition things for your clustering algorithm.
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d eigenvectors would match the
unnormalized eigenvectors of any other implementation.
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genvectors come _from_)
doesn't actually help narrow anything down. The only application of
eigenvector magnitudes of graph Laplacians that I am aware of is the
Fiedler vector, and that actually requires unit eigenvectors.
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I meant by the original eigenvector and sorry
> for the confusion the confusion. Most eigenvalues/eigenvalues calculators
> will give you 1 for first eigenvector
>
I'm afraid that doesn't really narrow anything down for us.
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to? It's
possible that there are specific procedures that happen to spit out vectors
that are eigenvectors but have semantics about the magnitude, but
`np.linalg.eig()` does not implement that procedure. The semantics about
the magnitude would be supplied by that specific procedure.
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xactly `a[2, 4]`. `a[2,
4]` translates to `a.__getitem__((2, 4))`. So there's no way for the array
to know whether it got `a[2, 4]` or `a[(2, 4)]`.
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on give
some more information:
https://stackoverflow.com/questions/1303182/how-does-blas-get-such-extreme-performance
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On Thu, Aug 25, 2022 at 3:47 PM Qianqian Fang wrote:
> On 8/25/22 12:25, Robert Kern wrote:
>
> I don't quite know what this means. My installed version of `jq`, for
> example, doesn't seem to know what to do with these files.
>
> ❯ jq --version
> jq-1.6
>
>
db'); *# loading/decoding*
> newx = np.concatenate(newy);*# regroup chunks*
> newx.dtype
>
>
> here are the output file sizes in bytes:
>
> 8000128 eye5chunk.npy
> 5004297 eye5chunk_bjd_raw.jdb
>
Just a note: This difference is solely due to a special r
e past, I have seen *each* of
those processes trying to use *all* of the main memory for their backlog of
old pages), but there are configuration tweaks that you can make.
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the data.
The alternative is to use `np.lib.format.open_memmap(filename, mode='w+',
dtype=dtype, shape=shape)`, then assign slices sequentially to the returned
memory-mapped array. A memory-mapped array is usually going to be
friendlier to whatever memory limits you are running into than
.@python.org
> https://mail.python.org/mailman3/lists/numpy-discussion.python.org/
> Member address: robert.k...@gmail.com
>
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tate
I do recommend moving to passing around a Generator when you can; even in
the older system, we've always recommended passing around a RandomState
instance.
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ned to use np.random.seed(), it is almost certainly not
one of these tasks.
If you want to describe your use case more specifically, I can give you
some more guidance on good patterns to replace it with the new system.
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, near as I can tell.
https://xarray.pydata.org/en/stable/index.html
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(c.f. discussion of a previous suggested addition[1]). This would be a good
multivariate distribution to add to scipy.stats, though.
[1] https://www.mail-archive.com/numpy-discussion@python.org/msg04724.html
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>
Computing the left-eigenvectors is no real problem. The underlying _GEEV
LAPACK routine can do it if asked. It's the same routine under
scipy.linalg.eig().
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of elements changes.
https://numpy.org/doc/stable/user/basics.indexing.html#boolean-array-indexing
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on can be converted to Rhino NURBS or if
Rhino itself can do a periodic parametric NURBS and do the fitting itself,
I don't know.
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ow.com/questions/20618804/how-to-smooth-a-curve-in-the-right-way
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ent mental model about what linspace()
does.
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we have no control over that inside of numpy.
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bout serialization of arrays. If the json module
did have some way for us to specify a default representation for our
objects, then that would be a different matter. But for the present
circumstances, I'm not seeing a substantial benefit to moving this code
inside of numpy. Outside of numpy, yo
On Tue, Oct 19, 2021 at 8:54 PM Hongyi Zhao wrote:
> On Wed, Oct 20, 2021 at 8:29 AM Robert Kern wrote:
> >
> > On Tue, Oct 19, 2021 at 8:22 PM wrote:
> >>
> >> Do I have to use it this way?
> >
> >
> > Nothing is forcing you to, but everyo
der why you wrote
it that way and if you meant something else and will have trouble reading
your code.
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On Tue, Oct 5, 2021 at 4:07 AM wrote:
[spam]
Okay, now, they're just messing with us.
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nk" and "alias" are probably not the best analogies. The
implementation of `np.ndarry.__invert__` simply calls `np.invert` to do the
actual computation.
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ors are not names that can
be resolved to objects that can be compared with the `is` operator.
Instead, when that operator is evaluated in an expression, the Python
interpreter will look up a specially-named method on the operand object (in
this case `__invert__`
is the one that gets expaneded to `BOOL_logical_not`:
https://github.com/numpy/numpy/blob/main/numpy/core/src/umath/loops.c.src#L493-L510
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c.src#L612-L626
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7;t go away for a
> while.
>
Given that we've had a literal order of magnitude more messages about the
spam than the spam itself, maybe it's just a blip?
I will suggest that spam management is probably not a strong, much less a
decisive, argument for migrating to
t, or is otherwised
>> >> deemed undesirable, perhaps just a note in the Project Description at
>> >> https://pypi.org/project/numpy/ to say that, if you want to run tests,
>> >> those two packages will be needed?
>> >>
>> >> Thanks,-- bennet
&g
less to juggle if you just compute it from the key each time.
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ngle `Generator` instance.
Instead, you can just make the ~200-1000 `Generator` instances.
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s :" He asked for the
> finger... and took the whole arm" .
>
Well, when I craft an overly-complicated system, I feel responsible to help
shepherd people along in using it well. :-)
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ent `seed`, they
>> will get another set of results (this is why you don't want to just use
>> `SeedSequence(stronghash(key))` all by itself).
>>
>> I put the job-specific seed data ahead of the main program's seed to be
>> on the super-safe side. The spaw
ahead of the main program's seed to be on
the super-safe side. The spawning mechanism will append integers to the
end, so there's a super-tiny chance somewhere down a long line of
`root_ss.spawn()`s that there would be a collision (and I mean
super-extra-t
public; the PR is as simple as
> removing the underscores and adding a docstring.
>
Delightful!
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nd cos() are often not implemented in
software, but by CPU instructions, so you don't want to reimplement them.
There is likely not a large accuracy win by removing the final
multiplication.
We do have sindg(), cosdg(), and tandg() in scipy.special that work
sim
ctionality (and thus all of these aliases in
`numpy.random`) are now frozen in functionality (per NEP 19), so we will
not be adding this functionality to them. If the `__array_function__`
developments eventually work out a good way to wrap methods, then we can
think about using that on
ould prefer the bottom-up description
style of naming. However, we are also in the midst of a diversifying
ecosystem of array libraries, largely driven by the ML domain, and adopting
some of that terminology when we try to enhance our interoperability wi
PI surface has declined even from its anemic starting point, now that deep
learning frameworks with ndarray-mimicking APIs have taken off.
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n out, set
> out[row,x[row]] = 1. Here is working code:
> def orthogonal_mod (x, nbits):
> out = np.zeros ((len(x), 1< for e in range (len (x)):
> out[e,x[e]] = 1
> return out
>
> Any idea to do this without an explicit python loop?
>
i = np.arange(
passing an
> array will be prohibited (as far as type checkers are concerned).*
>
> *The docs do mention that the outermost container should be a list or
> tuple anyway, so I’m not convinced that this new typing restriction would
> be a huge loss.*
>
; np.choose(a, (0,range(8)) #array([0, 1, 2, 0, 0, 0, 6, 7])
>>
>
This is equivalent to `np.choose(a, (np.zeros(8, dtype=int), range(8)))`
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On Wed, Apr 14, 2021 at 6:16 PM Andrew Nelson wrote:
> On Thu, 15 Apr 2021 at 07:15, Robert Kern wrote:
>
>> On Wed, Apr 14, 2021 at 4:37 PM Joachim Wuttke
>> wrote:
>>
>>> Regarding numpy, I'd propose a bolder measure:
>>> To let savetxt(fname
On Wed, Apr 14, 2021 at 6:20 PM Derek Homeier <
de...@astro.physik.uni-goettingen.de> wrote:
> On 14 Apr 2021, at 11:15 pm, Robert Kern wrote:
> >
> > On Wed, Apr 14, 2021 at 4:37 PM Joachim Wuttke
> wrote:
> > Regarding numpy, I'd propose a bolder m
to follow up with a pull request, but I am unable to
> find out how numpy.savetxt is invoking gzip.
>
`savetxt` uses the abstractions in this module to invoke gzip when the
filename calls for it:
https://github.com/numpy/numpy/blob/main/numpy/lib/_datasourc
i in F]`
list comprehension for data of this size. You aren't getting any benefit
trying to convert to arrays and using our array set operations. They are
written for 1D arrays of numbers, not 2D arrays (attempting to treat them
as 1D arrays of lists) and won't really work on your data.
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Robert Kern
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On Sat, Mar 13, 2021 at 4:18 PM wrote:
> So is it right that 100 arrays of one element is smaller than one array
> with size of 100 elements?
>
No, typically the opposite is true.
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Robert Kern
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