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kandi X-RAY | haven Summary
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QUESTION
I would like to get some basic sense of putting all the data manipulation steps within the reactive session. The reason I have to do this is because the input files are reactive so they made all the new created data frames be reactive as well.
It is not working when outputting the combined dataset from 2 dynamic input sas datasets.
DAT_A:
...ANSWER
Answered 2021-Jun-12 at 01:49You can use one fileInput
with multiple=TRUE
or two separate ones with multiple=FALSE
. The code below shows the latter way to do it.
QUESTION
I have defined a class where its __ge__
method returns an instance of itself, and whose __bool__
method is not allowed to be invoked (similar to a Pandas Series
).
Why is X.__bool__
invoked during np.int8(0) <= x
, but not for any of the other examples? Who is invoking it? I have read the Data Model docs but I haven’t found my answer there.
ANSWER
Answered 2021-Jun-11 at 01:11I suspect that np.int8.__le__
is defined so that instead of returning NotImplemented
and letting X.__ge__
take over, it instead tries to return something like not (np.int(8) > x)
, and then np.int8.__gt__
raises NotImplemented
. Once X.__gt__(x, np.int8(0))
returns an instance of X
rather than a Boolean value, then we need to call x.__bool__()
in order to compute the value of not x
.
(Still trying to track down where int8.__gt__
is defined to confirm.)
(Update: not quite. int8
uses a single generic rich comparison function that simply converts the value to a 0-dimensional array, then returns the result of PyObject_RichCompare
on the array and x
.)
I did find this function that appears to ultimately implement np.int8.__le__
:
QUESTION
I am trying to dynamically select directory from the computer where files are stored. Currently there is a sas dataset named 'sample' stored under my win10 PC desktop.
I would like to print out the first 10 observations of the sample dataset I read into, but it is not working without showing any error.
...ANSWER
Answered 2021-Jun-11 at 00:57Try this
QUESTION
I haven’t entirely given up on the idea of validators moonlighting as oracles for off-chain computation…based on this extensive discussion: https://gov.near.org/t/off-chain-computation-framework/1400/6
So far from studying Sputnik’s code, I have figured out the mechanics of how to upload a blob to a smart contract. Let's say that a blob represents a storage-less contract, having only stateless functions that act only on input to the function, and return those inputs modified.
Now I’m missing the piece of how Validators can download and execute the blob. As mentioned by Ilya in the link above, the NearSDK would be able to interpret the blob (if the blob is essentially a compiled contract), but it needs to be a modified version of the SDK...
Think of this like sandbox mode…blob cannot modify state of any other contract, but can read state (forget about the internet access part for now). Results of the blob execution are then fed back to a smart contract, where they have to match the results of every other validator who executed the blob. This can be done by hash comparison (rather than looping through the results individually), so it’s not an expensive comparison, especially because it’s all or nothing.
Question: how can a Validator download the blob and execute it via a sandboxed SDK, and post the result via the regular SDK to the blockchain? I am missing a lot of architectural context…and this is bringing me to the edge of giving on the idea. Please help prevent that from happening!
...ANSWER
Answered 2021-May-30 at 18:48If you are implementing this as a separate binary, your binary will be doing next things:
- Use RPC to load the WASM file from the blockchain. See RPC reference
- Use runtime-standalone to run this WASM with specific inputs. An example of using runtime standalone is here, but you will need to customize this with few things.
- The result should be sent as a transaction signed by this binary again via RPC.
If you want these WASM files to have access to state, you will need to load state inside this binary. There are two options:
- Modify a nearcore node to also do the above items
- Run nearcore in parallel, and open the database on read when you are initializing
Trie
(e.g. here load from disk instead).
If you want to add more host functions (like accessing internet), you will need to fork runtime-standalone to expose those functions.
QUESTION
I have a task that requires functions to read, write and display information, from and to .txt files.
I have completed the fist part of the code.
I am struggling to figure out this part of the question:
1. Add an option to generate reports to the main menu of the application.
The menu for the admin user should now look like this:
ANSWER
Answered 2021-Feb-02 at 15:35I ended up having to change some parts of my original code, but eventually and with a little help, I got the answers to the functions I was looking for...
Hope this helps someone else in the future!
QUESTION
I am trying to scrape the table on google colab from the following web page: https://247sports.com/college/penn-state/Sport/Football/AllTimeRecruits/
Below is the python script I am trying to use...
...ANSWER
Answered 2021-May-28 at 16:18You have two spans
with class meta
-- the first for school and the second for year (always in this order), so you can use find_all
to find both, and then extract school
from the first one and year
from the second one:
QUESTION
I am new to Couchbase and have been trying this for several hours. Have looked through the documentation but haven’t been able to locate this specific scenario, My bucket has documents:
...ANSWER
Answered 2021-May-28 at 02:59QUESTION
I’m loving the expanded CSS support in SVG2. It’s great not having to rewrite attributes over and over. So I’ve been converting some code in a project from SVG attributes to CSS. Most of this has worked just fine.
When it comes to transforms, things can seem tricky if you are comfy with how CSS transforms work in HTML. (This is especially true for rotate()
transformations, which is the focus of this question.) That’s because SVG doesn’t have the “automatic flow” that HTML does.
In other words, when you have a bunch of HTML elements, one after another, they will automatically lay themselves out according to the box model.
There is no such “automatic” or “default” layout in SVG. As a result, SVG transforms default to being calculated from the origin. (That’s 0,0
in user coordinates).
For most elements, there’s a simple solution: the awesome CSS property transform-box
. In most cases, using the following CSS will allow you to transform SVG elements in pretty much the same way as HTML elements:
ANSWER
Answered 2021-May-22 at 18:42So you want to put an element somewhere with , and then rotate it in place?
The simplest solution I have found does include the transform
attribute, but you don't need to specify the rotation point. See the following example, where the green rectangle does what you want.
In CSS, we include use
elements in the transform-box
rule. Then we position and rotate each element with the transform
attribute (replacing x
, y
and CSS rotation):
QUESTION
I have a very large dataset in SAS (> 6million rows). I'm trying to read that to R. For this purpose, I'm using "read_sas" from the "haven" library in R.
However, due to its extremely large size, I'd like to split the data into subsets (e.g., 12 subsets each having 500000 rows), and then read each subset into R. I was wondering if there is any possible way to address this issue. Any input is highly appreciated!
...ANSWER
Answered 2021-May-24 at 19:17Is there any way you can split the data with SAS beforehand ... ?
read_sas
has skip
and n_max
arguments, so if your increment size is N=5e5
you should be able to set an index i
to read in the i
th chunk of data using read_sas(..., skip=(i-1)*N, n_max=N)
. (There will presumably be some performance penalty to skipping rows, but I don't know how bad it will be.)
QUESTION
Our team intends to use JavaScript library observablehq/plot from an app written in C# and running on .NET 5. As a proof of concept, we were able to successfully use that library running in a separate process on Node.js. The downside of this approach is that we would need to implement all data serialization and inter-process communication ourselves, and we would need to bundle Node.js in our app installer. We are looking for an alternative approach that would not require Node.js, but instead would directly host V8 JavaScript engine in our .NET app. Currently, we are considering using ClearScript package for that. While we were able to successfully run simple JavaScript code using it, we discovered that observablehq/plot and its dependencies use some APIs that are present in Node.js, but are apparently unavailable in ClearScript out-of-the-box (it seems that Node.js implements some of those APIs in JavaScript, and some in C++). Making those implementations available to ClearScript running in .NET app looks like a significant task whose cost I cannot estimate at this point.
I would like to ask if anyone had to solve the same or similar problem, and what approach would you recommend? Is there an easy way to make all necessary APIs available to observablehq/plot running on ClearScript? Should I consider hosting Chromium/Edge browser engine in the .NET app instead? I haven’t yet tried this, but I assume it is possible because my understanding (correct me if I’m wrong) is that WebView2 control can be used in WPF apps running on .NET, and it is implemented using Chromium and V8 JavaScript engine. Is there any other approach you can recommend?
Update: The app GUI is built on Avalonia and SkiaSharp. It is possible that eventually we will choose another charting library, perhaps, one not written in JavaScript. But my task at hand is specifically to investigate whether and how we can use JavaScript libraries in our app, taking observablehq/plot as an example, and investigate its features and performance characteristics.
...ANSWER
Answered 2021-May-24 at 16:13If you are building a WPF desktop app you should try a WPF based chart library that feats your needs.
Open source libraries:
- OxyPlot
- InteractiveDataDisplay
- ScottPlot support pan and zoom.
Paid libraries:
More info about WPF charts in this post.
If you are using Blazor WebAssembly:
Use jsRuntime and JSObjectReference to import and call your Javascript observablehp library.
If you are using Xamarin.Forms the best professional library out there is probably SyncFusion:
Update:
Avalonia Framework only will support this through a webview / embedded browser as you stated above. Here you have 3 options:
- Cefnet is a .NET CLR binding for the Chromium Embedded Framework
- CefGlue same than above
- WebView Avaloria-CefGlue
For more usefull tools and libraries to use with Avalonia please refer to Awesome Avalonia.
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