Inversion | InversionEngine
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kandi X-RAY | Inversion Summary
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QUESTION
A permutation of integers from 1 to n is a sequence a1, a2, ..., an, such that each integer from 1 to n is appeared in the sequence exactly once.
Two integers in а permutation form an inversion, when the bigger one is before the smaller one.
As an example, in the permutation 4 2 7 1 5 6 3, there are 10 inversions in total. They are the following pairs: 4–2, 4–1, 4–3, 2–1, 7–1, 7–5, 7–6, 7–3, 5–3, 6–3.
Input n and array[n] 2<=n<=100,000
First I solved problem with bubble sorting but then i met time complexity problem.
Second I solved it mergesort but I didn't do well
Here is my cord
...ANSWER
Answered 2021-Apr-02 at 15:27I cannot find some implementation bits in your code that divides the arrays into sub-arrays based on the index(as quick sort sorts based on value) kindly have a look at the code provided below
QUESTION
I have to solve the equality between 2 matrices 12x12 containing a lot of symbolic variables and with which I perform inversion of the matrix. There are only one unknown called SIGAM_O, and FISH_O_SYM(1,1), FISH_O_SYM(1,2) and FISH_O_SYM(2,2) (FISH_O_SYM(2,1) = FISH_O_SYM(1,2).
My system is solved fastly when I take for example 2 matrices 2x2, the inversion is pretty direct.
Now, with the case of 2 matrices 12x12, I need before actually to inverse a 31x31 matrix of symbolic variables (I marginalize after), since inversion takes a lot of time.
I would like to benefit from my GPU NVIDIA card to achieve this inversion faster but the GPU optimization is not supported currently for Symbolic arrays.
Below the script where you will find the line of inversion:
...ANSWER
Answered 2021-May-02 at 10:23(Posted answer on behalf of the question author in order to move it to the answer space).
I resolve this issue by doing simply:
QUESTION
I am new to FreeRTOS and have been reading the FreeRTOS documentation and writing simple code using FreeRTOS on an STM32F767 Nucleo Board. In the simple program that I wrote, I used Binary Semaphores only to signal certain tasks when LPTIM and GPIO interrupts occur through xSemaphoreGiveFromISR(), and to signal a different task to perform certain operations from another task through xSemaphoreGive().
Suppose that I have an I2C1 peripheral connected to two different equipments:
- An accelerometer that triggers a GPIO interrupt to the microcontroller whenever an activity/movement occurs. This GPIO interrupt signals the microcontroller that a piece of data inside its Interrupt Event registers must be read so that the next activity/movement event can be signalled again.
- An equipment that must be read from periodically, which will be triggered through an LPTIM or TIM peripheral
Can I use a Mutex and a Binary Semaphore in the situation above?
The Binary Semaphores will indicate to the task that an operation needs to be performed based on the respective interrupts that were triggered, but the Mutex will be shared between those two tasks, where Task1 will be responsible with reading data from the accelerometer, and Task2 will be responsible for reading data from the other equipment. I was thinking that a Mutex will be used since these two operations should never occur together, so that there are no overlapping I2C transactions that happen on the bus that could potentially lock up either of the I2C devices.
The code would look like the following:
...ANSWER
Answered 2021-May-26 at 18:40In general, I think your design could work. The semaphores are signals for the two tasks to do work. And the mutex protects the shared I2C resource.
However, sharing a resource with a mutex can lead to complications. First, your operations tasks are not responsive to new semaphore signals/events while they are waiting for the I2C resource mutex. Second, if the application gets more complex and you add more blocking calls then the design can get into a vicious cycle of blocking, starvation, race conditions, and deadlocks. Your simple design isn't there yet but you're starting down a path.
As an alternative, consider making a third task responsible for handling all I2C communications. The I2C task will wait for a message (in a queue or mailbox). When a message arrives then the I2C task will perform the associated I2C communication. The operations tasks will wait for the semaphore signal/event like they do now. But rather than waiting for the I2C mutex to become available, now the operations tasks will send/post a message to the I2C task. With this design you don't need a mutex to serialize access to the I2C resource because the I2C task's queue/mailbox does the job of serializing the message communication requests from the other tasks. Also in this new design each task blocks at only one place, which is cleaner and allows the operations tasks to be more responsive to the signals/events.
QUESTION
I am working in this issue since 2 weeks without any result. Do someone know how to manage with lipq with blobs or bytea without losing format and any data? The exported file size is 0B, I can not understand the steps I must follow to upload a file to a postgreSQL database from C and pick it again with the correct format and features. Any help will be great. I tryed near every example and theory on the net, even PG documents and manuals, no way. I am close to quit programing and go farmer (not jocking xD). Thank you in advance.
After code modifications, I pick a file 59bytes higher than the file uploaded as large object. Feeling I am closer but changing my mind about using Large Objects.
...ANSWER
Answered 2021-May-20 at 14:47Like the documentation says:
The descriptor is only valid for the duration of the current transaction.
So you must call lo_open and lo_read in the same transaction.
Do not use large objects. They are slow, complicated to use and give you all kinds of serious trouble (for example, if you have many of them). Use bytea, then your code will become much simpler.
QUESTION
Imagine I have four projects in my solution:
- UI <- startup project
- Domain
- Repository
- Boot
The UI projects has dependencies to the Domain and Boot projects.
The Boot project has dependencies to the Domain and Repository projects for DI container configurations.
If I write this in ASP.NET Core 5, the UI code can access and instantiate Repository classes, even if I didn't have a dependency in the UI project.
In .NET Framework 4.8, this did not happen. This behavior turn an isolation impossible, so Dependency Inversion Principle in this configuration is easily breakable.
There is a way to turn that behavior off in ASP.NET Core 5?
...ANSWER
Answered 2021-May-17 at 12:15This is a default behaviour of .NET Core, if you want to change this and don't allow UI to have access to Repository layer indirectly, you can set it like below in .csproj file:
QUESTION
I am trying to use a glsl shader with p5js to create a simulation like the game of life. To do that I want to create a shader which will take a texture as uniform and which will draw a new texture based on this previous texture. In a next iteration this new texture will be used as uniform and that should allow me create a simulation following the idea exposed here. I am experienced with p5.js but I'm completely new to shader programming so I'm probably missing something.
For now my code is as straightforward as possible:
- In the
preload()function, I create a texture using thecreateImage()function and setup some pixels to be white and the others to be black. - In the
setup()function I use this texture to run the shader a first time to create a new texture. I also set a timer to run the shader at regular intervals and draw the result in a buffer. - In the
draw()function I draw the buffer in the canvas. - To keep things simple I keep the canvas and the texture the same size.
My issue is that at some point the y coordinates in my code seems to get inverted and I don't understand why. My understanding is that my code should show a still image but each time I run the shader the image is inverted. Here is what I mean:
I am not sure if my issue comes from how I use glsl or how I use p5 or a mix of both. Can someone explain to me where this weird y inversion comes from?
Here is my minimal reproducible example (which is also in the p5 editor here):
The sketch file:
...ANSWER
Answered 2021-May-18 at 08:52Long story short: the texture coordinates for a rectangle or a plane drawn with p5.js are (0, 0) in the bottom left, and (1, 1) in the top right, where as the coordinate system for sampling values from a texture are (0, 0) in the top left and (1, 1) in the bottom right. You can verify this by commenting out your color sampling code in your fragment shader and using the following:
QUESTION
I'm trying to configure an Ingress resource in an EKS cluster running v1.18 using the below configuration. after running kubectl apply -f blah.yaml I'm returned error: unable to recognize "blah.yaml": no matches for kind "Ingress" inversion "networking.k8s.io/v1" I think it's an apiversion mismatch. What am I missing?
ANSWER
Answered 2021-May-14 at 17:41You can check what is the apiVersions are present for networking.k8s.io resource in your system using
QUESTION
I need to perform a ZOH discretization of a continuous LTI state-space model in OpenModelica (OMEdit). I tried two ways of doing this:
- using matrix exponential (Matrices.exp function) for calculating discretized A matrix (Ad) and subsequent calculation of discretized B matrix (Bd) following equation: Bd = A-1 (Ad - I) B, where I is identity matrix; This algebraic equation can be solved either by direct calculation of matrix inversion (Matrices.inv function) or, more efficiently, by solving for Bd matrix using Matrices.solve2 function:
Bd = Matrices.solve2(A,(Ad-identity(2))), thus avoiding calculation of matrix inversion. However, in both cases A matrix must be invertible, what generally (and very often) doesn't hold. - using Matrices.integralExp function which should return both discretized matrices (Ad, Bd) and should work for general matrix A, whether invertible or singular; However, this function does not work for me - it returns error message: "No viable alternative near token: (".
I attach code for both methods for demonstration purpose. The state space model represents a very simple second-order system of linearized pendulum with length 1 m, mass 1 kg and gravitational acceleration 9.81 m/s2. Sampling time for discretization is 0.1 s. The first code works fine (A is invertible in this particular case) but the second code doesn't. Does anybody know what am I doing wrong? I'd be grateful for any advice.
method #1:
...ANSWER
Answered 2021-May-03 at 18:10You forgot the equation keyword in example 2. It still won't work in OpenModelica since it seems to have a problem with the alias na=size(A,1) in that function but you could easily fix the source code to make that work.
QUESTION
Given a square matrix A as a NumPy array, like
ANSWER
Answered 2021-May-12 at 13:00Following @projjal 's comment, all of these are equivalent to compute the inverse of a square matrix:
QUESTION
I have a service that returns Products that I can extend via GraphQL Federation in a service returning Reviews. The review service depends on the Products and this decoupling is just awesome!
I also have an order service that stores (among other things) OrderItems that have a productId:
ANSWER
Answered 2021-May-09 at 09:24Stupid me! It actually is as simple as I had assumed, I've just been chasing an unrelated (albeit cryptic to me) error message.
I just have to add a resolver that returns an instance of my Product stub (i.e. containing only the id). The rest works like a charm!
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