Pivot_wider: Combine Duplicate Observations AND Create New Variable Columns for Those Values

I’m new to R and have scoured the site to find a solution – I’ve found lots of similar, but slightly different questions. I’m stumped. I have a dataset in this structure: SURVEY_ID CHILD_NAME CHILD_AGE Survey1 Billy 4 Survey2 Claude 12 Survey2 Maude 6 Survey2 Constance 3 Survey3 George 22 Survey4 Marjoram 14 Survey4 LeBron… Read More Pivot_wider: Combine Duplicate Observations AND Create New Variable Columns for Those Values

May 26, 2022 MRLeave a comment

R Aggregate data frame based on column values

I have a data set that looks like this: > newex Name Volume Period 1 oil 29000 Jun 21 2 gold 800 Mar 22 3 oil 21000 Jul 21 4 gold 1100 Sep 21 5 gold 3000 Feb 21 6 depower 3 Q1 21 7 oil 23000 Apr 22 8 czpower 26 Q1 23 9… Read More R Aggregate data frame based on column values

May 23, 2022 MRLeave a comment

How to correctly run an async thread in a test method?

I have this test that needs to run the RunWebSocket thread to make sure the SendAsync was received by my websocket. This works, but I am getting compiler warning CS4014. Of course, I do not like warnings, so instead of ignoring it, I want to do it "right". [Fact] public async void CabinetTagPushed_ShouldSendBroadcastToWebSocket() { //… Read More How to correctly run an async thread in a test method?

May 23, 2022 MRLeave a comment

Is there a 2-D "where" in numpy?

This might seem an odd question, but it boils down quite a simple operation, that I can’t find a numpy equivalent for. I’ve looked at np.where as well as many other operations but can’t find anything that does this: a = np.array([1,2,3]) b = np.array([1,2,3,4]) c = np.array([i<b for i in a]) The output is… Read More Is there a 2-D "where" in numpy?

May 19, 2022 MRLeave a comment

MVVM for SfChat Control in Xamarin Forms

Does the SfChat control for Xamarin Forms require specific properties for Messages? In my model, I do have the ObservableCollection<MessageModel> messages property to handle messages but the properties of my MessageModel are different than what’s in the getting started documentation. Do they need to match e.g. Author, Text, etc? For example, in my model, the… Read More MVVM for SfChat Control in Xamarin Forms

May 19, 2022 MRLeave a comment

Understanding broadcasting and arithmetic operations on different dimension tensors

I’m currently working on computing various similarity metrics between vectors such as cosine similarity, euclidean distance, mahalanobis distance, etc. As I’m working with vectors that can be very large, I need compute time to be minimal. I’m struggling to understand how to work with vectors of different dimensions (they, do, however, share one dimension) and… Read More Understanding broadcasting and arithmetic operations on different dimension tensors

May 18, 2022 MRLeave a comment

Grab all text (including new lines) with Regex

I’m trying to figure out how to grab all the text after [text](URL), but I’m having difficulty including the entire text after it because of the new lines (\n\n). I’m currently trying variations of (?<=.\)\n\n)(.*\n+), but it’s only including the next paragraph. Here’s what the text looks like: — layout: post title: "13 – First… Read More Grab all text (including new lines) with Regex

May 18, 2022 MRLeave a comment

Is there a way to show the count of elements in an HTML element?

I have following dynamically created html markup: <div class="container"> <div class="tmb"><h2 class="tmb-title">Tips & tricks</h2><img src="…"></div> <div class="tmb"><h2 class="tmb-title">About us</h2><img src="…"></div> <div class="tmb"><h2 class="tmb-title">Start up</h2><img src="…"></div> </div> I wanted to add a subtitle before each .tmb-title. So I added following jQuery: $("<p class=’podcast-episode’>Episode 1</p>").insertBefore(".tmb-title"); This adds the subtitle ‘Episode 1’ before each .tmb-title, which is what… Read More Is there a way to show the count of elements in an HTML element?

May 16, 2022 MRLeave a comment

Why didn't x86 implement direct core-to-core messaging assembly/cpu instructions?

After serious development, CPUs gained many cores, gained distributed blocks of cores on multiple chiplets, numa systems, etc but still a piece of data has to pass through not only L1 cache (if on same core SMT) but also some atomic/mutex synchronization primitive procedure that is not accelerated by hardware. I wonder why didn’t Intel… Read More Why didn't x86 implement direct core-to-core messaging assembly/cpu instructions?

May 11, 2022 MRLeave a comment

Unconventional data frame reshaping using dcast

I want to convert table dt: Who T Res Pam 2 B Pam 3 E Pam 5 F Bob 2 B Bob 5 C into Who T1 Res1 T2 Res2 T3 Res3 Pam 2 B 3 E 5 F Bob 2 B 5 C NA NA using dcast or other function/s from data.table. I have… Read More Unconventional data frame reshaping using dcast

February 26, 2022 MRLeave a comment

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Tag: dcast