loops

问题 I have two arrays arr1 and arr2 with sizes (90000,1) and (120000,1) . I'd like to find out if any element of axis=0 of arr1 is present on arr2 . Then write their positions on to a list and later remove them. This will ensure that none of the elements on either lists could be found on the other. For now, I'm using for loops: list_conflict=[] for i in range (len(arr1)): for j in range (len(arr2)): if (arr1[i]==arr2[j]): list_conflict.append([i,j]) fault_index_pos = np.unique([x[0] for x in list

问题 I have one mysql table which contains 2 columns and looks like this... ------------------------------------------- | sku | superseded_sku | +---------------------+-------------------+ | part1 | part2 | | part2 | part3 | | part3 | part4 | | part5 | part6 | | part6 | part7 | the table basically shows where products sold by a company have been replaced by something newer. My task is to reshape the table to resemble the following... ------------------------------------------- | sku | superseded

问题 Below, I'm wondering how to use BASE R function quantile() separately across elements in L that are named EFL and ESL ? Note: this is a toy example, L could contain any number of similarly named elements. foo <- function(X) { X <- as.matrix(X) tab <- table(row(X), factor(X, levels = sort(unique(as.vector(X))))) w <- diag(ncol(tab)) rosum <- rowSums(tab) obs_oc <- tab * (t(w %*% t(tab)) - 1) obs_c <- colSums(obs_oc) max_oc <- tab * (rosum - 1) max_c <- colSums(max_oc) SA <- obs_c / max_c h <-

问题 Below, I'm wondering how to use BASE R function quantile() separately across elements in L that are named EFL and ESL ? Note: this is a toy example, L could contain any number of similarly named elements. foo <- function(X) { X <- as.matrix(X) tab <- table(row(X), factor(X, levels = sort(unique(as.vector(X))))) w <- diag(ncol(tab)) rosum <- rowSums(tab) obs_oc <- tab * (t(w %*% t(tab)) - 1) obs_c <- colSums(obs_oc) max_oc <- tab * (rosum - 1) max_c <- colSums(max_oc) SA <- obs_c / max_c h <-

问题 I am working with this code and would like to get the result inside intTotal . But it doesn't give me the result I wish. window.onload = function() { var intNum = document.getElementById("intNum"); for (var i = 1; i <= 3000; i++) { var option = document.createElement("option"); option.innerHTML = i; option.value = i; intNum.appendChild(option); } }; function jml_total() { var hrg_sat = parseInt(document.querySelector("hrg_sat").innerHTML); var jml_pilih = parseInt(document.getElementById(

问题 I am working with this code and would like to get the result inside intTotal . But it doesn't give me the result I wish. window.onload = function() { var intNum = document.getElementById("intNum"); for (var i = 1; i <= 3000; i++) { var option = document.createElement("option"); option.innerHTML = i; option.value = i; intNum.appendChild(option); } }; function jml_total() { var hrg_sat = parseInt(document.querySelector("hrg_sat").innerHTML); var jml_pilih = parseInt(document.getElementById(

问题 There are countless examples out there for my problem, I know, but I went through a lot of them and can't figure out where my mistake is. I am iterating over an ArrayList(TestSzenario). The class TestSzenario contains a String Variable called name with proper getters and setters. Here's my code: <td><select name="selectSzenario" id="selectSzenario" size="1"> <c:forEach items="<%=testszenario.getSzenariosForSummary() %>" var="szenario"> <option>${szenario.name}</option> </c:forEach></select><

问题 I just read this post, and wonder if we can draw the conclusion that a big loop within a small loop must always run faster than a small loop within a big one, no matter what the code does inside the nested loop? Take an example. int m, n; m = 1000000; n = 10; Snippet A for (int i = 0; i < n; i++) for (int j=0; j < m; j++) { DoSomething(); } Snippet B for (int j = 0; j < m; j++) for (int i=0; i < n; i++) { DoSomething(); } Can we say that, no matter what DoSomething() actually does, snippet A

问题 Description of loop from Control.Arrow : The loop operator expresses computations in which an output value is fed back as input, although the computation occurs only once. It underlies the rec value recursion construct in arrow notation. Its source code, and its instantiation for (->) : class Arrow a => ArrowLoop a where loop :: a (b,d) (c,d) -> a b c instance ArrowLoop (->) where loop f b = let (c,d) = f (b,d) in c This immediately reminds me of fix , the fixpoint combinator: fix :: (a -> a)

问题 I've been thinking a lot about code and libraries like React that automatically, well, react to events as they happen, and was wondering about how all of that is implemented at the lower levels of C++ and machine code. I can't seem to figure out any other way something like an event listener could be implemented with if not with a while loop running on another thread. So is that all this is under the hood? Just while loops all the way down? Like, for example, RethinkDB, which advertises