nested-loops | 易学教程

How to create patterns in Python using nested loops?

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问题 I am trying to create this pattern in Python: ## # # # # # # # # # # I have to use a nested loop, and this is my program so far: steps=6 for r in range(steps): for c in range(r): print(' ', end='') print('#') The problem is the first column doesn't show up, so this is what is displayed when I run it: # # # # # # This is the modified program: steps=6 for r in range(steps): print('#') for c in range(r): print(' ', end='') print('#') but the result is: # # # # # # # # # # # # How do I get them

nodejs Async.each Nested loop Confusion

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问题 i want to have two nested for loops async.each(ListA, function(itemA,callback1){ //process itemA async.each(itemA.Children, function(itemAChild,callback1){ //process itemAChild callback1(); }), function(err){ console.log("InnerLoopFinished") } callback(); }),function(err){ console.log("OuterLoopFinished") } console.log("Process Finished") Now i expect an output Like { InnerLoopFinished OuterLoopFinished } according to List Size and process Finsished Bt what i get is Process Finished at First

How to use nested FOR loops in batch files

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问题 I have some code in which I want to use a FOR loop to handle a set of files. As part of handling a file there's a FOR /F loop that reads it and appends data to an other file based on the file name. In order to be able to set the output file name I have delayed variable expansion set on. This is what the code should look like as I originally intended it to be: setlocal enabledelayedexpansion for %%f in (DataFolder\*.Ext) do ( set POI=%%~f set POI=!JbPOI:DataFolder\=! set POI=!JbPOI:.Ext=! for

variable number of dependent nested loops

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问题 Given two integers n and d , I would like to construct a list of all nonnegative tuples of length d that sum up to n , including all permutations. This is similar to the integer partitioning problem, but the solution is much simpler. For example for d==3 : [ [n-i-j, j, i] for i in range(n+1) for j in range(n-i+1) ] This can be extended to more dimensions quite easily, e.g., d==5 : [ [n-i-j-k-l, l, k, j, i] for i in range(n+1) for j in range(n-i+1) for k in range(n-i-j+1) for l in range(n-i-j

How to assign same color to factors across plots in a nested loop for ggplot?

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问题 I am trying to use scale_fill_manual to assign corresponding colors to factors across many plots in a nested for loop. However, the resulting plots end up all being black. My overall loop is as follows: for(i in seq(from=0, to=100, by=10)){ for{j in seq(from=0, to=100, by=10)){ print(ggplot(aes(x , y), data = df)+ geom_point(inherit.aes = FALSE,data = subset(df,factor_x==i&factor_y==j), aes(x, y, size=point,color=Group))+ theme_bw()}} I am trying to assign each factor in "Group" its own color

Time complexity O(N) of nested loops with if-statement: O(N^4)?

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问题 I am trying to figure out a tight bound in terms of big-O for this snippet: for(int i = 1 ; i <= n ; i++) { for(int j = 1; j <= i*i ; j++) { if (j% i == 0){ for(int k = 0 ; k<j ; k++ ) sum++; } } } If we start with the inner most loop, it will in worst case run k = n^2 times, which accounts for O(N^2). The if-statement will be true every time j = m*i, where m is an arbitrary constant. Since j runs from 1 to i^2, this will happen when m= {1, 2, ..., i}, which means it will be true i times, and

Lisp macro (or function) for nested loops

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问题 Is it possible to write a Common Lisp macro that takes a list of dimensions and variables, a body (of iteration), and creates the code consisting of as many nested loops as specified by the list? That is, something like: (nested-loops '(2 5 3) '(i j k) whatever_loop_body) should be expanded to (loop for i from 0 below 2 do (loop for j from 0 below 5 do (loop for k from 0 below 3 do whatever_loop_body))) Follow up As huaiyuan correctly pointed out, I have to know the parameters to pass to

Nested Loops Ruby

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问题 Having Difficulty understanding this nested loop problem: You have 10 pebbles (numbered 1-10). They are by default black. You must alter them by painting them white if they are black or painting them black if they are white. There are 10 rounds. Every round, you must alter the pebbles that are multiples of the current round. The pebbles are by default black. 1st round, you alter every pebble (paint them all white). 2nd round, you alter every other pebble(you paint pebbles #2,4,6,8,10 black).

Implement matrix config in Jenkins pipeline

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I've recently moved to the Pipeline plugin in Jenkins. I've successfully used freestyle jobs before for my project, but now would like to test something new. My project builds for Windows and Linux, in release and in debug mode, and uses a parameter, called device , to configure some C preprocessor macros: globally #define d frame_width and frame_height differ, depending on device value. Here is my Jenkinsfile: def device_config(device) { def device_config = ""; switch(device) { case ~/^dev_[Aa]$/: device_config="""-DGLOBAL_FRAME_WIDTH=640\ -DGLOBAL_FRAME_HEIGHT=480""" break; case ~/^dev_[Ss]$

Javascript: for loop 'for(i=0; i < 3 ; i++)' terminates too early without using continue, break or return

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问题 Consider the following piece of code: function A() { for(i = 0; i < 3; i++) { console.log("---" + i + "---"); B(); } } function B() { for(i = 0; i < 3; i++) { console.log(i); } } A(); Expected Output: ---0--- 0 1 2 ---1--- 0 1 2 ---2--- 0 1 2 Received Output: ---0--- 0 1 2 I've used a for loop as described here. This is the first result when searching for "javascript for loop" with Google. And dozens of examples are found that suggest a similar approach. Quote from www.w3schools.com : for (i