russ | A hopefully soon-to-be css-in-Rust solution

This is avery simple React jsx to js convertor project we're using to integrate React code into a legacy .aspx website. Eventually the who website will be written in React.

Whenever the Fragment shorthand <> is used the compiler returns a SyntaxError: Unexpected token.

Sample.js

How can I find the date/time of the last edit to my entire wiki? I would like to write this date/time to a text file and then present it as info on one of my wiki pages as described here using the ExternalData extension.

thank you, russ

Note 1: Error message I'm getting (using ExternalData 2.3) after editing LocalSettings.php

Note 2: The error message I'm getting after upgrading to ExternalData 3.0

Note 3: After replacing {{#get_external_data: with {{#get_db_data: I get this result (using either 2.3 or 3.0):

Note 4: Relevant lines from LocalSettings.php

I currently have a lists of captions in the form of a list

Researching the interface value in go - I found a great (maybe outdated) article by Russ Cox. According to it:

The itable begins with some metadata about the types involved and then becomes a list of function pointers.

The implementation for this itable should be the one from src/runtime/runtime2.go:

I am trying to scrape a German Billiard League website for results, to tabulate and submit to a rating system that requires a certain format. I am no python expert, but I have muddled through how to pull a complete list of links from the root League page, and to get Date, Home/Visitor teams, and now I am trying to capture individual match data.

Here is the relevant HTML:

I am having fun with pydrake for the region of attraction (RoA) analysis. There is one type of non-linear system involving trigonometry that got me stuck. A similar problem has been posted here.

As Russ points out in that post, there are 2 solutions: 1) shifting to another state-space; 2) using Taylor expansion. I am applying the 2nd approach to the pendulum case to get a feeling. The system dynamics are given in here. Here is what I have:

1. Linearize the system, and find an LQR, whose cost-to-go function will help to propose a Lyapunov candidate:

I'm a student teaching myself Drake, specifically pydrake with Dr. Russ Tedrake's excellent Underactuated Robotics course. I am trying to write a combined energy shaping and lqr controller for keeping a cartpole system balanced upright. I based the diagram on the cartpole example found in Chapter 3 of Underactuated Robotics [http://underactuated.mit.edu/acrobot.html], and the SwingUpAndBalanceController on Chapter 2: [http://underactuated.mit.edu/pend.html].

I have found that due to my use of the cart_pole.sdf model I have to create an abstract input port due receive FramePoseVector from the cart_pole.get_output_port(0). From there I know that I have to create a control signal output of type BasicVector to feed into a Saturation block before feeding into the cartpole's actuation port.

The problem I'm encountering right now is that I'm not sure how to get the system's current state data in the DeclareVectorOutputPort's callback function. I was under the assumption I would use the LeafContext parameter in the callback function, OutputControlSignal, obtaining the BasicVector continuous state vector. However, this resulting vector, x_bar is always NaN. Out of desperation (and testing to make sure the rest of my program worked) I set x_bar to the controller's initialization cart_pole_context and have found that the simulation runs with a control signal of 0.0 (as expected). I can also set output to 100 and the cartpole simulation just flies off into endless space (as expected).

TL;DR: What is the proper way to obtain the continuous state vector in a custom controller extending LeafSystem with a DeclareVectorOutputPort?

Thank you for any help! I really appreciate it :) I've been teaching myself so it's been a little arduous haha.

I am working on Exercise 3.9 (virtual wall) from Russ Tedrake's Robotic Manipulation course, and I'm receiving the runtime error above when attempting to add the end-effector position constraint. I've been stuck on this almost all day, so I caved and decided to post. Another post had a similar error, but it wasn't enough for me to see what's going wrong. I'll try to give as little information as necessary to avoid showing my solution to the problem.

Here is the code with some lines missing.

I have tried to install the h3 package, and it seemed to work: