conserve | 🌲 robust portable backup tool in Rust | Continuous Backup library
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kandi X-RAY | conserve Summary
[beta] robust portable backup tool in Rust
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QUESTION
TL;DR: Matrix multiplication for state transition matrix should be norm preserving, but np.matmul
does not conserve norm. How can I fix this? Is there a better python module to do so?
I have a right state transition matrix, A, i.e., s(t)A(tau)=s(t+tau)
where s(t) is a column matrix which sums to 1. Also, we know that each row of A adds upto 1 as well.
We know that A^n is also a right state transition matrix for any n in natural numbers.
One way to find the steady state distribution is to compute A^n as n goes to infinity. The following snippet calculates A^(2^n):
...ANSWER
Answered 2022-Apr-09 at 14:29The problem comes from the fact that the operation is not numerically stable. As a result it quickly diverge (exponentially) to 0 or infinity even with relatively-small values of n
like 70. You can use a diagonalization method based on eigenvalues (see here for more informations) which is far more numerically stable.
QUESTION
I was working with micropython on a SEEED XIAO (SAMD21) using version 1.18, and wanted to use 'compiled' libraries (.mpy
) to conserve space. I had mpy-cross for version 5 which worked okay for me. I also wanted to have floating point so I built a new micropython with that option- from the latest (20220302) github version- and noticed that mpy-cross had updated to version 6. I thought I would check to see which versions of .mpy
were used The micropython documentation suggests some code to check the version of .mpy
using the sys.implementation
object. I noticed a variety of sys.implementation
implementations.
Version 1.18- released by micropython 20220117 on the XIAO SAMD21 gave the following results:
...ANSWER
Answered 2022-Mar-27 at 18:05If you want to use precompiled/bytecode .mpy files then you will need to Decide to use either bytecode or compile to native code for your mcu platforms.
For bytecode you will need to distribute a bytecode version that matches the runtime firmware, 1.12-1.18 == 5, next version will increase
For native code you'll need to distribute versions for each platform that you want to support. An esp32c3 cannot run stm32 native code and vice-versa
Also the different ports/board will indeed have differences in some of the stdlib APIs. Your code must be robust enough to handle these differences.
QUESTION
I am making a simulation where you create different balls of certain mass, connected by springs which you can define (in the program below all springs have natural length L and spring constant k). How I do it is I created a function accel(b,BALLS), (note b is the specific ball and BALLS are all of the ball objects in various stages of update) which gets me acceleration on this one ball from calculating all the forces acting on it (tensions from ball the springs connected to it and gravity) and I would think this function is definitely correct and problems lie elsewhere in the while loop. I then use the RK4 method described on this website: http://spiff.rit.edu/richmond/nbody/OrbitRungeKutta4.pdf in the while loop to update velocity and position of each ball. To test my understanding of the method I first made a simulation where only two balls and one spring is involved on Desmos: https://www.desmos.com/calculator/4ag5gkerag I allowed for energy display and saw that indeed RK4 is much better than Euler method. Now I made it in python in the hope that it should work with arbitrary config of balls and springs, but energy isn't even conserved when I have two balls and one spring! I couldn't see what I did differently, at least when two balls on involved. And when I introduce a third ball and a second spring to the system, energy increases by the hundreds every second. This is my first time coding a simulation with RK4, and I expect you guys can find mistakes in it. I have an idea that maybe the problem is caused by because there are multiple bodies and difficulties arises when I update their kas or kvs at the same time but then again I can't spot any difference between what this code is doing when simulating two balls and my method used in the Desmos file. Here is my code in python:
...ANSWER
Answered 2022-Feb-27 at 10:53The immediate error seems to be this
QUESTION
I have a list of lists. Every element of the main list is a list that correspond to a note,every note in the list, has an integrer called fold_ID. I want to sample one note of each folder ID. I am currently doing this:
...ANSWER
Answered 2022-Feb-27 at 21:58You could try this way.. lets assume your list-of-lists is called mylist
, and it has the structure that you show above
QUESTION
I am trying to combine rows of data based on levels of other variables I have attached a sample of my data below.
...ANSWER
Answered 2022-Feb-01 at 21:59Here is a potential solution using dplyr
:
QUESTION
I'm having trouble getting a table of results.
Command:
answer <- get_multimir(url = NULL, org = "hsa", mirna = "MIMAT0000450", target = NULL, disease.drug = "cancer", table = "validated", predicted.cutoff = NULL, predicted.cutoff.type = "p", predicted.site = "conserved", summary = FALSE, add.link = FALSE, use.tibble = TRUE, limit = NULL, legacy.out = FALSE)
When I am trying to create a table using:
write.table(answer,"C:\\Users\\Someone\\Desktop\\Rresults\\data.csv", row.names=FALSE)
it results in the following error:
...Error in as.data.frame.default(x[[i]], optional = TRUE) : cannot coerce class ‘structure("mmquery_bioc", package = "multiMiR")’ to a data.frame
ANSWER
Answered 2022-Jan-22 at 13:38get_multimir
is used to retrieve predicted and validated miRNA-target interactions and their disease and drug associations from the multiMiR package.
It returns an object of class mmquery_bioc
The error:
Error in as.data.frame.default(x[[i]], optional = TRUE) : cannot coerce class ‘structure("mmquery_bioc", package = "multiMiR")’ to a data.frame
is informing you that R does not know how to convert this object into a data frame.
It is not completely clear what you are trying to achieve but if I was to take a guess, perhaps you just need the data
slot from this object:
QUESTION
I wrote a function to traverse multiple DNA sequence lists and graph their homology as a fraction of identical base content, so that one can easily see regions of high homology vs. regions of low homology across multiple species.
To do this, I pass a numpy array of m sequence lists from an alignment file (clustal in this case):
...ANSWER
Answered 2022-Jan-13 at 17:27I think you might have overthought this problem a bit.
QUESTION
I have an issue with background size. Basically if you will change the viewport size of this page https://attiliosantomo.com/sfera the background is not following the viewport dimension, but it conserve previous viewport dimension and only if I refresh the page background will update to viewport size. Can someone help me? How would like my background follow viewport size by scaling his dimension.
...ANSWER
Answered 2021-Dec-27 at 17:21Your are using
element with
css (widht & height) inline
, for your custom css you should use!important
with size valuesFor
element use
object-fit
instead ofbackground-size
like this:
QUESTION
I want to apply a partial tucker decomposition algorithm to minimize MNIST image tensor dataset of (60000,28,28), in order to conserve its features when applying another machine algorithm afterwards like SVM. I have this code that minimizes the second and third dimension of the tensor
...ANSWER
Answered 2021-Dec-28 at 21:05So if you look at the source code for tensorly
linked here you can see that the documentation for the function in question partial_tucker
says:
QUESTION
I need to rerender the components GridSquare from component GridPixels. When the users clicks the button "Reset Colors" the component should reset the child components generated by a map.
The flow is:
User clicks "Reset Colors" button. This button is inside GridPixels component.
Gridpixels component should rerender.
The GridSquare component should be reset. This means that his state should be reset. The purpose of this is that inside GridSquare there is a css class called "set-color-red". When resetting the GridSquare component, the state inside GridSquare component should contain "".
All the GridSquare components are rerendered but the state is mantained. I need to reset the state for every GridSquare component from the GridPixels component.
I tried adding one to the index map each time the "Reset Colors" button is clicked but the state is conserved, is not reset.
...ANSWER
Answered 2021-Dec-15 at 23:41You can use a key
prop on your parent.
The special key
prop is used by React to help it understand which components are to be rerendered with prop changes and which should be scrapped and rebuilt.
We run into this most often when mapping over something to build a list.
Pass a callback down to your children that will update the value of key
.
See the forked sandbox: https://codesandbox.io/s/react-functional-component-forked-vlxm5
Here are the docs: https://reactjs.org/docs/lists-and-keys.html#keys
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Install conserve
To build Conserve you need Rust and a C compiler that can be used by Rust. To install the most recent release from crates.io, run. To install from a git checkout, run. On nightly Rust only, you can enable a potential speed-up to the blake2 hashes with.
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