moon | Moon is a small Lisp-dialect written purely in Rust | Natural Language Processing library
kandi X-RAY | moon Summary
kandi X-RAY | moon Summary
Moon is a small Lisp-dialect written purely in Rust. This should allow Rust programs (including games) to have access to a high-quality scripting language that’s also safe. Moon is made to work extremely well with Rust or even C.
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QUESTION
I was simulating the solar system (Sun, Earth and Moon). When I first started working on the project, I used the base units: meters for distance, seconds for time, and metres per second for velocity. Because I was dealing with the solar system, the numbers were pretty big, for example the distance between the Earth and Sun is 150·10⁹ m.
When I numerically integrated the system with scipy.solve_ivp, the results were completely wrong. Here is an example of Earth and Moon trajectories.
But then I got a suggestion from a friend that I should use standardised units: astronomical unit (AU) for distance and years for time. And the simulation started working flawlessly!
My question is: Why is this a generally valid advice for problems such as mine? (Mind that this is not about my specific problem which was already solved, but rather why the solution worked.)
...ANSWER
Answered 2021-Jul-25 at 07:42Most, if not all integration modules work best out of the box if:
- your dynamical variables have the same order of magnitude;
- that order of magnitude is 1;
- the smallest time scale of your dynamics also has the order of magnitude 1.
This typically fails for astronomical simulations where the orders of magnitude vary and values as well as time scales are often large in typical units.
The reason for the above behaviour of integrators is that they use step-size adaption, i.e., the integration step is adjusted to keep the estimated error at a defined level. The step-size adaption in turn is governed by a lot of parameters like absolute tolerance, relative tolerance, minimum time step, etc. You can usually tweak these parameters, but if you don’t, there need to be some default values and these default values are chosen with the above setup in mind.
DigressionYou might ask yourself: Can these parameters not be chosen more dynamically? As a developer and maintainer of an integration module, I would roughly expect that introducing such automatisms has the following consequences:
- About twenty in a thousand users will not run into problems like yours.
- About fifty a thousand users (including the above) miss an opportunity to learn rudimentary knowledge about how integrators work and reading documentations.
- About one in thousand users will run into a horrible problem with the automatisms that is much more difficult to solve than the above.
- I need to introduce new parameters governing the automatisms that are even harder to grasp for the average user.
- I spend a lot of time in devising and implementing the automatisms.
QUESTION
I'm trying to run through some image recognition tutorials, but I keep running into this error that's preventing me from proceeding. I'm running Ubuntu 21.10, and Python 3.9.7. My code is as such.
...ANSWER
Answered 2021-Nov-17 at 18:56I got the same issue after upgrading to Ubuntu 21.10 (from 20.10).
Installing an older version of OpenCV worked for me.
QUESTION
I am running a Spring Boot app that uses WebClient for both non-blocking and blocking HTTP requests. After the app has run for some time, all outgoing HTTP requests seem to get stuck.
WebClient is used to send requests to multiple hosts, but as an example, here is how it is initialized and used to send requests to Telegram:
WebClientConfig:
...ANSWER
Answered 2021-Dec-20 at 14:25I would propose to take a look in the RateLimiter direction. Maybe it does not work as expected, depending on the number of requests your application does over time. From the Javadoc for Ratelimiter: "It is important to note that the number of permits requested never affects the throttling of the request itself ... but it affects the throttling of the next request. I.e., if an expensive task arrives at an idle RateLimiter, it will be granted immediately, but it is the next request that will experience extra throttling, thus paying for the cost of the expensive task." Also helpful might be this discussion: github or github
I could imaginge there is some throttling adding up or other effect in the RateLimiter, i would try to play around with it and make sure this thing really works the way you want. Alternatively, consider using Spring @Scheduled to read from your queue. You might want to spice it up using embedded JMS for further goodies (message persistence etc).
QUESTION
I'm trying to toggle between a moon icon and a sun icon on a dark mode project. The original javascript code was simply a button that switched from day mode to dark mode. After some research, I ended up with the following code, which "kinda" works but is sketchy; it switches from day mode to dark mode and the icon toggles from moon to sun BUT, when I come back to the page after setting my preference as dark mode (or refreshing the page in dark mode), the icon disappears.
...ANSWER
Answered 2022-Feb-13 at 03:43You need to toggle both classes each time you want to make a switch.
Your code was using the toggle method as though it would swap moon for sun but it really just toggles whether the individual class is there. I've toggled both classes when we need to make a change, and commented out the local storage stuff to avoid JS errors with the SO snippet, but otherwise didn't change your code.
QUESTION
I'm building my project with Vue.js 3, Vite.js. The app works fine when in dev mode (when using the dev server). Once I do launch the build command, Vite creates for me the /dist directory containing the build for my app. If I run the preview command (vite preview) it starts with no problem the preview of my build.
The problem is with some images which are coming from Vue components. All the images of my project are in the src/assets directory.
...ANSWER
Answered 2022-Jan-24 at 11:27Instead of using relative path (..) to the assets folder, you can use @/assets from any of the vue components to refer to files in the assets folder.
E.g this should work, no matter how deep the Vue component is nested.
QUESTION
I have made a update on my question at Calculating date time in perl,
this is another try. the only problem i have is evaluating or comparing to have good output.
i want to output only. lets say if the minutes less than 60 or equal to 60 print minutes when others values like hours days and months are equal to 0
...ANSWER
Answered 2022-Jan-13 at 19:01The problem is that 2 months and 5 minutes will show as 5 minutes.
It's because you're starting with the smallest unit when you should be starting with the largest unit.
QUESTION
I'm trying to do a Dark mode button toggle, the fist step that I want to make is a icon that changes when I click in the button, but my code isn't running.
That's my code:
ANSWER
Answered 2022-Jan-11 at 19:44v-if="isDark = true" means assigning true to isDark not comparing them, the comparison should be like v-if="isDark === true" but you could just do v-if='isDark':
QUESTION
This is my first stack overflow question, so if I am presenting something wrong, please let me know. I am pretty new to computer programming, so I just have a small webpage where I am just implementing things that I am learning.
I made a little quiz with random trivia multiple choice questions you can take if you press a button. I am using window prompts to ask the questions and get the answers, and I have all of the questions and answers stored as objects with question/prompt and answer pairs. All of those objects are stored in an array in a variable called shortQuizPrompts. I already have the quiz working and everything, aka., It tells you after every question if you got the answer to that question right or wrong, and it gives you a grade afterwards... I also have it set up so that if you enter an answer that is not "a", "b", "c", or "d", it lets you know that it isnt a valid answer. Those sorts of things.
As of right now, you can choose how many questions long you want the quiz to be out of the 24 total questions I have so far. It just asks the questions in the order that they are stored in the array. For example, you will never be asked the last question in the array if you do not choose for the quiz to be the full 24 questions long. However, I want to make the quiz ask the questions in a random order, while also removing those questions from the array as to not ask the same question multiple times.
I have tried increasing the iterator while looping through the array to a random number from 0 to the length of however many questions they chose. Then checking to see if the iterator was larger than the length of the number of questions they chose, it would decrease the iterator until it found a question that is still in the array that it could ask...
If anyone knows how to go about doing that, it would be great. Sorry for the long question btw. I am pretty new to coding, so this is probably a simple answer, but I digress. I'm pretty sure I did everything right. Thx.
...ANSWER
Answered 2022-Jan-12 at 01:03You can shuffle the shortQuizPrompts array before starting the quiz. Array shuffle details can be found in this answer.
QUESTION
I have created a dark theme toggle button using CSS, HTML, and JavaScript:
...ANSWER
Answered 2022-Jan-10 at 09:03 .box .ball {
/* BOX-WIDTH/2 */
width: 30px;
/* BOX-WIDTH/2 */
height: 30px;
background-color: grey;
transition: all 1s ease;
position: absolute;
border-radius: 50%;
border: 3px solid black;
box-sizing: border-box;
}
QUESTION
Its easy to get the percentage of the moon illuminated on a given day
...ANSWER
Answered 2022-Jan-06 at 14:46Eureka!
I found the answer on this site
The way they solve the problem is by calculating the area of the overlap between the two circles, and then subtract it to the area of the moon circle. For that, the distance between the centre of the two circles must be known, which is exactly what I needed (xmn).
For that they calculate the area of the crescent of the bigger circle, then find the area of the overlap between the two, and finally the area of the crescent of the smaller circle. Then we can find the percentage of the total area.
Somehow, the equation to find the area of the crescent of the bigger circle (lune_1 on the website), gives me the area of the smaller crescent instead. Don't really understand why but it fits my purpose.
If only I still had the math chops to pull it off, solving equation lune_1 in order to find "d" would give me a direct answer, in which lune_1= illuminated area and d=distance between the centre of the two circles.
After a few adjustments, I ended up with this code
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Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.
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