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QUESTION
I have a two dimensional numpy arrays which describes a list of coordinates where something happens. There are two events on the scene and I would like to calculate where those two are. But I do have difficulties to distinguish those two since there isn't any good pattern from event to event.
Example:
...ANSWER
Answered 2021-Jun-15 at 13:53There are all manner of clustering algorithms and many are implemented in scikit-learn.cluster. They are well documented and the docs have nice examples, but the various algorithms have trade-offs which can take a while to figure out. For example if you have a general idea about how spaced the clusters are (reflected in the eps
ilon parameter) you can get good results with DBSCAN:
QUESTION
I have users in a Cognito user pool, some of whom are in an Administrators
group. These administrators need to be allowed to read/write to a specific S3 bucket, and other users must not.
To achieve this, I assigned a role to the Administrators
group which looked like this:
ANSWER
Answered 2021-Jun-15 at 12:03The solution lies in the federated identity pool's settings.
By default the identity pool will provide the IAM role that it's configured with. In other words, one of either the "unauthenticated role" or the "authenticated role" that it's set up with.
But it can be told instead to provide a role specified by the authentication provider. That's what will solve the problem here.
- In the AWS console, in Cognito, open the relevant identity pool.
- Click "Edit identity pool" (top right)
- Expand "Authentication Providers"
- Under Authenticated Role Selection, choose "Choose role from token".
That will allow Cognito to specify its own roles, and you will find that the users get the privileges of their group.
QUESTION
I would like to merge these two anonymous objects:
...ANSWER
Answered 2021-Jun-12 at 09:19There's nothing built-in in the C# language to support your use case. Thus, the question in your title needs to be answered with "Sorry, there is no easy way".
I can offer the following alternatives:
Do it manually:
QUESTION
I was wondering if there is a clever way to automatically generate setters/getters of a child class within the parent class with metaprogramming, like that :
...ANSWER
Answered 2021-Jun-10 at 10:51Contrary to Python, which I believe you reference here, Kotlin is a strongly typed language, so it is not possible to generate properties or fields dynamically.
You can use delegated properties to at least make it a little more "dynamic":
QUESTION
Edit: I wish SO let me accept 2 answers because neither is complete without the other. I suggest reading both!
I am trying to come up with a fast implementation of a function that given an unsigned 32-bit integer x
returns the sum of 2^trailing_zeros(i)
for i=1..x-1
, where trailing_zeros
is the count trailing zeros operation which is defined as returning the 0 bits after the least significant 1 bit. This seems like the kind of problem that should lend itself to a clever bit manipulation implementation that takes the same number of instructions regardless of the input, but I haven't been able to derive it.
Mathematically, 2^trailing_zeros(i)
is equivalent to the largest factor of 2 that exactly divides i
. So we are summing those largest factors for 1..x-1
.
ANSWER
Answered 2021-Jun-06 at 10:20Observe that if we count from 1 to x instead of to x−1, we have a pattern:
x sum sum/x 1 1 1 2 3 1.5 4 8 2 8 20 2.5 16 48 3So we can easily calculate the sum for any power of two p as p • (1 + ½b), where b is the power (equivalently, the number of the bit that is set or the log2 of the power). We can see this by induction: If the sum from 1 to 2b is 2b•(1+½b) (which it is for b=0), then the sum from 1 to 2b+1 reprises the individual term contributions twice except that the last term adds 2b+1 instead of 2b, so the sum is 2•2b•(1+½b) − 2b + 2b+1 = 2b+1•(1+½b) + ½•2b+1 = 2b+1•(1+½(b+1)).
Further, between any two powers of two, the lower bits reprise the previous partial sums. Thus, for any x, we can compute the cumulative number of trailing zeros by summing the sums for the set bits in it. Recalling this provides the sum for numbers from 1 to x, we adjust by to get the desired sum from 1 to x−1 subtracting one from x
before computation:
QUESTION
So I need to use my own cglib proxy for Entities. Problem is that when I am saving it into database, all values are null, even-though I would expect that hibernate gets the values with getters - that would get them through the proxy from the original entity. But it seems like it takes the values some other way. My question is, how do I enhance the proxy or update hibernate config so that it saves the values of original? It does the same thing with its own proxies after all, so there must be some way. Here is an example:
...ANSWER
Answered 2021-Jun-07 at 11:07You will have to use property access rather than field access if you want this. This means, you put all the annotations on the getters rather than the fields.
QUESTION
I have a C++ project that I build using GCC and CMake.
Generally I like to compile with -fmax-errors=1
. My normal workflow is to fix the first error and then rebuild since subsequent errors are often caused by the first one.
But unfortunately, with C++20, an error involving a constraint failure is often treated as multiple "errors" by GCC. In order to see why the constraint failed, I need to see more than one error.
So occasionally I like to set -fmax-errors
to a higher number, probably 2
, when such an error occurs.
But changing the compiler flags (by manually changing CMakeLists.txt
or passing a cache variable to cmake
on the command line) invalidates the CMake cache and makes the build start from scratch.
This behavior generally makes sense of course; arbitrary configuration changes could require a rebuild. But we humans understand that changing the compiler's error-formatting behavior doesn't require a rebuild. Is there a way of expressing this distinction to CMake?
Or, failing that, is there a clever way of working around this? I thought of having CMake read an environment variable at the time when the compiler is invoked (not at the time when cmake
is run), but I can't find any documentation suggesting that this is actually possible.
(I could probably create a script that forwards most of its arguments to g++
but also adds -fmax-errors="$MY_COOL_ENV_VARIABLE"
and then tell CMake that the script in question is the C++ compiler to build with, but I imagine that this might violate some of CMake's expectations about the "compiler.")
ANSWER
Answered 2021-Jun-05 at 09:21At the advice of Marc Glisse, I gave the approach that I hypothesized in parentheses at the end of the question a try. This in fact works quite well.
I now have a Python script called invoke_compiler.py
in the top-level directory of my project. I point CMake to the script in the usual way in which one specifies a C++ compiler.
QUESTION
When typing 1.1.1.1
in address bar of a browser it opens up https://1.1.1.1/
, This is first time I saw .1
top level domain so I looked it up on various domain registrars. I could not find it so I checked if was actually a TLD on iana.org and wikipedia.org. It does not seem to be a top level domain so I went back and checked TLS certificate which was issued to https://cloudflare-dns.com/
So I thought it was maybe a clever JavaScript hack which changes URL after page load but then I checked network requests and they seem to have 1.1.1.1
as domain name too (shown below)
ANSWER
Answered 2021-May-27 at 15:00I saw .1 top level domain
It is not.
1.1.1.1
is an IPv4 address, that is all. Nothing more, nothing less. And the website on it has a certificate with the IP address, which is possible, yet rare.
When you use any URL, with an hostname, that hostname is converted to an IP address and the browser connects to it. You can however put an IP address directly in an URL in which case the browser connects to it directly, it skips the DNS resolution of name to IP address.
Numerical TLD are forbidden by current ICANN rules, exactly to disambiguate them with IP addresses.
See my longest explanation at Number in the top-level domain? about TLDs and numbers in them.
How does cloudflare do this?
Anyone could do exactly the same as them, but with obviously less usefulness. Just make sure to create the proper certificate, some CAs allow to provide certificates on IP addresses, but not all of them, and it is not the standard case. The webserver should also be configured accordingly, to accept an IP address in the URL where it would expect an hostname to be able to serve the proper website, especially if multiple ones are on the host (in which cases for HTTPS you need separate IP addresses, one per website).
QUESTION
Hi there those way cleverer than me!
I have a Google script to export a pdf from a Google sheet which works fine. However I have an image in a cell that is not displayed in the exported pdf, instead it just says "CELLIMAGE". If I manually export the pdf it displays the image correctly...
My code is:
...ANSWER
Answered 2021-May-28 at 01:17It seems that in your script, the cells are overwritten by destRange.setValues(sourcevalues);
. I thought that this might be the reason of your issue. And, in your script, the values have already been copied by var destSpreadsheet = SpreadsheetApp.open(DriveApp.getFileById(sourceSpreadsheet.getId()).makeCopy("tmp_convert_to_pdf", folder))
. So in this case, how about the following modification?
In this modification, I used the following flow.
- Copy the 1st tab.
- Overwrite the data to the copied sheet.
- Copy the images in the cells to the copied sheet.
- Delete the temporal sheet.
When this flow is reflected to your script, it becomes as follows.
Modified script: From:QUESTION
Background
I am currently building a „Data-Logger“ - App using R Shiny. I do have an REST - API, which returns a value, that changes over time. My goal is to create an Shiny App, in which an user can click on an actionbutton to start writing the values fetched from the api periodically (e.g. every 60 seconds) to a dataframe. The logging of the data also should be stopped, when the user clicks on another actionbutton.
Problem
My problem is writing a function that starts executing when a button is pressed, executes periodically after that and stops executing when another button is pressed.
Previous Ideas
I previously tried using invalidateLater(), but i could not achieve what i desire.
Can you guys help me out with a clever thought or idea?
Thanks in advance!
...ANSWER
Answered 2021-Apr-26 at 17:13This should show how it works. invalidateLater()
is the right choice. The start/stop buttons change a reactive expression that determines whether polling is on or off. That way, the reactive RestPoll
expression gets notified every time it gets switched on/off and, of course, after 500 ms as long as Running() == TRUE
.
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Install clever
You can use clever like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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