bm | Binary merkle tree implementation | Dataset library
kandi X-RAY | bm Summary
kandi X-RAY | bm Summary
Binary merkle tree implementation with support of merkleization, de-merkliezation and in-place tree modification.
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QUESTION
Problem
I'm trying to clip a very large block model (5.8gb CSV file) containing centroid x, y, and z coordinates with an elevation raster. I'm trying to obtain only the blocks lying just above the raster layer.
I usually do this in ArcGIS by clipping my block model points to the outline of my raster and then extracting the raster values to the block model points. For large datasets this takes an ungodly amount of time (yes, that's a technical term) in ArcGIS.
How I want to solve it
I want to speed this up by importing the CSV to Python. Using Dask, this is quick and easy:
...ANSWER
Answered 2022-Mar-31 at 20:54The optimal way of linking dask and geopandas is the dask-geopandas package.
QUESTION
I am trying to pull across data from within over 800 links and putting it onto a table. I have tried using chrome selector gadget but cannot work out how to get it to loop. I must have spent 40 hours and keep getting error codes. I need to pull the same information from li:nth-child(8) , li:nth-child(8) strong
and another couple text boxes of information. I have tried following a YouTube video and I just changed the names and links but otherwise maintained consistency and it just will not work.
ANSWER
Answered 2022-Mar-09 at 12:46We can use simple for
loop,
QUESTION
this is the log when vscode install vscode-server in host
i found that it got vscode-server commit id as follow log:
...ANSWER
Answered 2022-Feb-24 at 05:55I had this problem as well since this morning and what was odd for me was that I could SSH from the terminal to the target host with no problem.
After some debugging, it seems like the Remote - SSH
extension is causing the trouble. The following two options worked for me. Either:
Downgrading the extension to 0.70.0 works for me. The current version (0.74.0 as of now) was updated just two days ago and I think this update is causing the trouble.
If you would like to keep the current version, then turning off
remote.ssh.useLocalServer
also works. If you're on a mac, go to Code > Preferences > Settings (Cmd
+,
) and then typeremote.ssh.useLocalServer
and it'll show the option which is turned on by default. Turning this off did the trick for me too.
QUESTION
I am creating a pixel art editor for Android, and to do this, I am using a Canvas with a Bitmap.
Here is an exert of some of my code (MyCanvasView
) which handles the majority of pixel art functionality:
ANSWER
Answered 2022-Jan-24 at 18:53Why are you resizing the bitmap? Why are you creating a new bitmap every time onDraw
is called?
Every time you resize the bitmap, you cause a magnification or minification algorithm to be applied. That's probably the cause of the distortions you're seeing.
You should create one bitmap at start, and render that in the onDraw method. The matrix you're calculating in getResizedBitmap
should instead be used as an argument to this function
QUESTION
I am new to Python. Questions below:
I have a list of urls I want to scrape data from. I don't know what is wrong with my code, I am unable to retrieve results from all urls. The code is only scraping the first url and not the rest. How can I successfully scrape data (title, info, description, application) in all urls in the list?
If question 1 works, how can I convert the data into a CSV file?
Here is the code:
...ANSWER
Answered 2021-Dec-16 at 15:41Try the following kind of approach:
QUESTION
My horizontal collection view (only when it has 0 cells) causes a crash when attempting to refresh the parent view. When there are 0 items (i.e. "shownStations") for the collection view, the collection view is hidden. When refreshing the parent view, an API call is made to get any available items for the collection view. The code of the collection view that seems relevant to the error message (below) is as follows:
...ANSWER
Answered 2021-Oct-27 at 20:34Somewhere in your program someone is probably calling scrollToItems(at:,scrollPosition:)
. They either don't know the collection is empty and are just passing in (row:0, item:0)
as the index path instead of just skipping the scroll call altogether. Or they think your collection contains at least one item.
To further diagnose the issue, I would either set a breakpoint on exceptions or set a breakpoint on the UIScrollView
function and look at the backtrace to see who is making the call.
You also want to check your Data Source to make sure it's been updated with the correct number of items at the time the scroll happens.
But having a backtrace to find out who or what is causing the scrollview to scroll would be a great first step.
QUESTION
# Erlang/OTP 24, Elixir 1.12.3
bmp_signature = <<66, 77>>
#=> "BM"
<<^bmp_signature, _::binary>> = <<66, 77, 30, 0>>
#=> ** (MatchError) no match of right hand side value: <<66, 77, 30, 0>>
...ANSWER
Answered 2021-Oct-04 at 15:42Your syntax is slightly off. Remember that the pin operator ^
pins only a single value. In your example, you were trying to pin it to 2 values.
So if the thing you are trying to match on is a binary with 2 values that you are aware of, then you would need to pin both of them, e.g.
QUESTION
I'm trying to add the HMS into our GMS first app. This is a massive application so we decided to try the HMS Toolkit conversion software. The toolkit added the necessary dependencies and modules and made the appropriate replacements where needed but when I try to build our application, I get the following errors regarding the generated module's dependencies:
...ANSWER
Answered 2021-Aug-25 at 23:41Try updating your dependencies to the latest available versions.
'com.huawei.hms:hwid:5.3.0.301' --> 'com.huawei.hms:hwid:6.0.1.300' 'com.huawei.hms:push:5.3.0.300' --> 'com.huawei.hms:push:5.3.0.304'
Here's a link to a list of the latest SDK versions. https://developer.huawei.com/consumer/en/doc/development/HMSCore-Guides/hmssdk-kit-0000001050042513
QUESTION
I have some problems.
I have a Panel and a PictureBox in a Form.
I would like to open a Windows application (for example Notepad) and parent it to the panel.
I then want to show an image of the content of the Panel in the PictureBox:
My code:
...ANSWER
Answered 2021-Aug-24 at 07:01Since you want to render to Bitmap the content of a Panel - which is hosting an external application - you cannot use Control.DrawToBitmap(): the contents of the hosted application, parented calling SetParent()
, won't be printed.
Since you also want to exclude from the rendering any other Window that may be hovering over the Panel, you can use the PrintWindow function, passing the handle of the Panel's Parent Form.
The Form will receive a WM_PRINT
or WM_PRINTCLIENT
message and will print itself to the Device Context specified: in this case, generated from a Bitmap.
This is not a screenshot: the Window paints itself and its content to a DC, so it doesn't matter whether other Windows are hovering / partially of fully overlapping it, the result is the same.
I'm using DwmGetWindowAttribute, setting DWMWA_EXTENDED_FRAME_BOUNDS
, to get the bounds of the Window to print. It may seem redundant, but, if your app is not DpiAware and you have a High-Dpi screen, it will appear less redundant in that case. Better have it, IMO.
This function is more reliable than, say, GetWindowRect
or GetClientRect
, it will return correct measures in variable DPI contexts.
You cannot pass the handle of a child Window to this function, so I'm using the Handle of the Parent Form to generate the Bitmap, then select the section where the Panel is located. This is determined by:
[ParentForm].RectangleToClient([Child].RectangleToScreen([Child].ClientRectangle))
Start the Process and parent Notepad's Window to the Panel control:
QUESTION
I've been inspired the 2015 code::dive conference "Writing Fast Code" talk by Andrei Alexandrescu: https://www.youtube.com/watch?v=vrfYLlR8X8k
I took the llvm std::all_of code and benchmarked it against a direct call to std::all_of(). I used google benchmark, and a range of 0 - 65535 elements (that all satisfy the predicate):
...ANSWER
Answered 2021-Jul-08 at 09:34As the comments above say, you're comparing the libstdc++ version of all_of
with the libc++ version which you copied into your code, and the libstdc++ version is faster.
As for why it's faster: std::all_of
calls std::find_if_not
, which calls __find_if_not
. This function negates the predicate and calls __find_if
, passing it the iterator category as an additional parameter.
__find_if
has two overloads: One for input iterators, which is similar to the implementation you showed above. The other is for random access iterators. This overload can calculate the length of the range, which allows it to unroll the loop and perform four predicate calls in each iteration. This is the reason it can work faster on random-access containers such as std::vector
.
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