Just like the question says. Is there a faster way to do what is done below when the vector size is very large (> 10M entries) using base R? The code below works, but when the vector size ...

Why does t(mat1) %*% mat2 work quicker than crossprod(mat1, mat2). Isn't the whole point of the latter that it calls a more efficient low-level routine? r$> mat1 <- array(rnorm(100 * 600), di...

I need to create a simple tooltip library that works like this: every DOM element with a specific attribute combination (like class="tooltip", data-tooltip-text="some text") automatically displays...

Suppose there are many binary strings x <- c("0100100010101010", "0100110010101010","0111001000","010111") I am looking for a fast method in R to output...

Exploring the Oxygen package to build APIs I found this I haven't been able to solve When I run this API (with a 150 ms sleep to simulate the time taken by a model): using Oxygen @get "/mod...

I need to reduce the memory used by my native Windows C++ application, without compromising its performances. My main data structure is composed by several thousands of instances, dynamically allo...

The fringe of a binary tree is the sequence composed by its leaves, from left to right. The same-fringe problem [Hewitt & Patterson, 1970] consists of determining whether two binary trees have ...

I've wrote my code for Longest Common Prefix in LeetCode, but it was returned "Time Limit Exceeded". There is no specific error message, so I have no idea how to fix my code to pass test cases. c...

I have a list of things. Is there any difference between list.Count > 0 and list.Count != 0? Or any performance difference in these codes? if (list.Count > 0) // do some stuff if (list.Cou...

I have a problem with Kotlin files in android studio. when the file is too large (for example more than 2000 lines), the android studio is not responding and actually, it freezes when I try to work...

We're creating a heavy-load network-traffic-centric application and run those server quite successful for many, many years under Java 8. Network-traffic-centric means that quite often the server ha...

I'll start this question from notion that I've seen a similar question on StackOverflow, but that question had only answer for the difference. What I'm asking is what should I use depending on sit...

Previous in I have used ctr+d for duplicating the code many times, but when I switched to desktop and installed vs code and all the necessary extensions for my react project. And now this CTRL+D ke...

GAS is quite powerful and you could write a full fledged web-app using a Google Sheet as the DB back-end. There are many reasons not to do this but I figure in some cases it is okay. I think the bi...

I know micro-benchmarking is hard. I'm not trying to build a poor micro-benchmark. Rather, I have run into this problem when making (what I thought to be) harmless refactoring. There is stripped do...

Consider this: a = array(1:60, c(3,4,5)) # Extract (*,2,2)^th elements a[cbind(1:3,2,2)] # ^^ returns a vector of length 3, c(16, 17, 18) # Note this is asymptotically inefficient -- cbind(1:k,2...

I have a matrix which would be a matrix of factors if R supported them. I want to print the matrix with the factor names, rather than integers, for readability. Using indexing loses the matrix stru...

I have an array of points in unknown dimensional space, such as: data=numpy.array( [[ 115, 241, 314], [ 153, 413, 144], [ 535, 2986, 41445]]) and I would like to find the average euclidean dista...

I'm performing a regular expression match on a column of type character varying(256) in PostgreSQL 8.3.3. The column currently has no indices. I'd like to improve the performance of this query if I...

I'm working with DataTable's and I need to convert them to a CSV file format. Most of the tables I am working with have over 50,000 records so I'm trying to minimize the time it takes to convert th...

I'm trying to profile an application written in go which apparently uses about 256 virtual memory (checked using ps aux). I'm trying to use pprof package and see what functions allocate/consume mos...

The following is a question about the performance of the ABAP TRY/CATCH construct. In particular, it is not about throwing or catching exceptions. Is there a performance cost when entering TRY/CATC...

I have tried to google for answers to this, but perhaps there isn't widely available research or perhaps I'm not using the right terms. Basically, I would like to have some idea as to the average ...

I want to know difference between Using index condition and Using where; Using index. I think both method use index to fetch first result record set, and filter using WHERE condition. Q1. What's t...

Let's say I have two variables: >>> a = "hello" >>> b = "world" I can concatenate them in two ways; using +: >>> a + b "helloworld" Or using an f-string: >>&...