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kandi X-RAY | phd Summary
kandi X-RAY | phd Summary
A monolithic repository for (almost) everything I have done while at the University of Edinburgh. Living an #open life.
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QUESTION
This is my first post here and I am not that experienced, so please excuse my ignorance.
I am building a Monte Carlo simulation in C++ for my PhD and I need help in optimizing its computational time and performance. I have a 3d cube repeated in each coordinate as a simulation volume and inside every cube magnetic particles are generated in clusters. Then, in the central cube a loop of protons are created and move and at each step calculate the total magnetic field from all the particles (among other things) that they feel.
At this moment I define everything inside the main function and because I need the position of the particles for my calculations (I calculate the distance between the particles during their placement and also during the proton movement), I store them in dynamic arrays. I haven't used any class or function,yet. This makes my simulations really slow because I have to use eventually millions of particles and thousands of protons. Even with hundreds it needs days. Also I use a lot of for and while loops and reading/writing to .dat files.
I really need your help. I have spent weeks trying to optimize my code and my project is behind schedule. Do you have any suggestion? I need the arrays to store the position of the particles .Do you think classes or functions would be more efficient? Any advice in general is helpful. Sorry if that was too long but I am desperate...
Ok, I edited my original post and I share my full script. I hope this will give you some insight regarding my simulation. Thank you.
Additionally I add the two input files
...ANSWER
Answered 2021-Jun-10 at 13:17I talked the problem in more steps, first thing I made the run reproducible:
QUESTION
This is the function i have written
...ANSWER
Answered 2021-Jun-04 at 16:19It looks like you are expecting the function to change the object that you are passing to it in the parent environment. This is fundamentally not how R works.
One workaround would be to return data1
at the end of your function and assign it when called:
QUESTION
I have several files in a folder that look like "blabla_A1_bla.txt", "blabla_A1_bla.phd","blabla_B1_bla.txt", "blablabla_B1_bla.phd"...and all the way to H12. Then I have a df that indicates which sample is each one.
well sample A1 F32-1 B1 F13-3 C1 B11-4 ... ...I want to rename the files in the folder according to the table. So that A1 gets replaces by F32-1, B1 by F13-3 and so on.
I have created a list of all the files in the directory with files<-list.files(directory). I know how to use the str_replace function of the stringr package to change them one by one, but I don't know how to make it automatic. I guess I need a loop that reads cell 1,1 of the dataframe, searches that string in "files" and replaces it with the value in cell 1,2. And then moves to cell 2,1 and so on. But I don't know how to code this. (Or if there is a better way to do it).
I'll appreciate your help with this.
...ANSWER
Answered 2021-Jun-01 at 11:54I would first create a vector of new names and then use the function file.rename
:
QUESTION
To give context to my issue. I am trying to move a list of files, where if the resolution is greater than 3.00, then move to a directory, Above3.
...ANSWER
Answered 2021-May-25 at 15:143.00 is a float value. Bash cannot process floating point values, only integers, hence the error message.
You could treat it as a string and compare it alphabetically if you can get your number in a fixed format (e.g. with two digits after the decimal point).
But I'd rather advise you use the command bc which is specifically made for calculations:
QUESTION
I'm creating a correlation table using the correlate function in the corrr package. Here is my code and a screenshot of the output.
...ANSWER
Answered 2021-May-16 at 17:40We can use:
QUESTION
I am trying to get the second last value in each row of a data frame, meaning the first job a person has had. (Job1_latest is the most recent job and people had a different number of jobs in the past and I want to get the first one). I managed to get the last value per row with the code below:
first_job <- function(x) tail(x[!is.na(x)], 1)
first_job <- apply(data, 1, first_job)
...ANSWER
Answered 2021-May-11 at 13:56You can get the value which is next to last non-NA value.
QUESTION
I'm a PhD student who's currently navigating R.
I've got a rather large dataset looking at the mass of leaves, organized by where they're found on the plant. For a part of this project, we'd like to see the combined mass and mean mass for the treatments.
Unfortunately, our code seems to be just summing up the mass of all leaves in the study.
I've pared down all the packages to 4 essential packages to eliminate the possibility of conflicts between the packages, and I've used Conflicted to try and determine if there's any conflicts (there aren't).
The output for the code below is simply 47588, the combined mass of all leaves in this study. It should be analyzing them using our treatments.
What do y'all think?
...ANSWER
Answered 2021-May-02 at 19:47It may be the dplyr::summarise
got masked by plyr::summarise
QUESTION
I have a dataset upon which I would like to implement the Naïve Bayes algorithm but it is triggering an error on line 107; str_column_to_float(dataset, i) as follows; "could not convert string to float:''" I thought it was because of the headers for the various columns but even after I removed them and run the code, it is still giving me the same error. Any help will very much be appreciated. The link to the dataset is as follows; [Dataset][1] The code is below
...ANSWER
Answered 2021-May-02 at 01:19The ValueError is being raised because float() is trying to cast a word to a string.
QUESTION
I am trying to recode some variables to factors to perform some basic visualizations. However, I encounter following error:
Error:
...ANSWER
Answered 2021-Apr-25 at 17:42First of all try dplyr::mutate...
Anyway:
Use across
rather then mutate_at
->
Scoped verbs (_if, _at, _all) have been superseded by the use of across() in an existing verb
This code is explicitly on your Dem_edu columns and it should work now
QUESTION
I need help with writing a git post-receive hook.
I need the hook to call external .exe file and pass in parameters.
This is my hook so far:
...ANSWER
Answered 2021-Apr-21 at 13:11I need these parameters per every commit in the push
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