transform | 易学教程

Groupby and transform two columns in df into matrix R [duplicate]

阅读更多关于 Groupby and transform two columns in df into matrix R [duplicate]

问题 This question already has answers here : Create columns from factors and count [duplicate] (2 answers) Closed 3 years ago . I would like to convert the following data.frame into a matrix where the the number of each bike station id that occurs per hour is counted. > dim(test) [1] 80623 5 head(test, n = 10) bikeid end.station.id start.station.id diff.time hour 1 16052 244 322 6544 14 2 16052 284 432 3406 21 3 16052 461 519 33416 3 4 16052 228 519 26876 13 5 16052 72 435 388 17 6 16052 319 127

Mozilla Animation Kit not working

阅读更多关于 Mozilla Animation Kit not working

问题 I am trying to animate an element and make it appear on button click. The below code works perfectly fine in Chrome, but doesn't work for Mozilla Firefox. Any help is greatly appreciated. Thanks CSS Class for animation: .moz-trial{ -moz-animation:moz-trial 2s; -webkit-animation: moz-trial 1s; } @-webkit-keyframes moz-trial { 0% { opacity: 0; -moz-transform: translateX(-20px); -webkit-transform: translateX(-20px); } 50% { opacity: 0.8; -moz-transform: translateX(+20px); -webkit-transform:

Implementing Google PATCH semantic with Playframework 2.4 Json transformers

阅读更多关于 Implementing Google PATCH semantic with Playframework 2.4 Json transformers

问题 I can not come up with solution for Patch semantic: if json has no property, I need skip modification if json property has null , I need to remove this property (for not required properties) in other cases I need to set the value I need transformation into mongo.db update command ("$unset" for 2, "$set" for 3) For example I need store json with required property "summary" . So: {"summary": "modified by patch", "description": null} must be transformed to: { "$set" : { "summary": "modified by

Mapping column values

阅读更多关于 Mapping column values

问题 I would like to transform the values of a given column using some mapping function. Example: df <- data.frame(A = 1:5, B = sample(1:20, 10)) df A B 1 1 17 2 2 5 3 3 3 4 4 11 5 5 19 6 1 16 7 2 4 8 3 7 9 4 6 10 5 9 My goal is to map all elements of column A as following: 1 -> "tt" 2 -> "ff" 3 -> "ss" 4 -> "fs" 5 -> "sf" I have written the following: mappingList <- c("tt", "ff", "ss", "fs", "sf") df$A <- unlist(lapply(df$A, function(x){replace(x, x>0, mappingList[x])})) df A B 1 tt 17 2 ff 5 3

DL之RetinaNet：基于RetinaNet算法(keras框架)训练自己的数据集(.h5文件)从而实现目标检测daiding

阅读更多关于 DL之RetinaNet：基于RetinaNet算法(keras框架)训练自己的数据集(.h5文件)从而实现目标检测daiding

DL之RetinaNet：基于RetinaNet算法(keras框架)训练自己的数据集(.h5文件)从而实现目标检测daiding 目录输出结果设计思路训练代码输出结果设计思路更新…… 训练代码 #!/usr/bin/env python """ Copyright 2017-2018 Fizyr (https://fizyr.com) Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 核心代码源自：http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied

Apply transformation to result of previous transformation on SVG path

阅读更多关于 Apply transformation to result of previous transformation on SVG path

问题 If I apply a translation of (100, 0) to an SVG path, it shifts left by 100px. But if I first rotate the path, then the translation happens along a diagonal. I understand why this happens -- the rotation has rotated the axes, thus making the translation along the x axis no longer horizontal. There are times, however, when this isn't desirable, when I'd like to apply a transformation to the result of a previous one rather than having it be affected by or affect those previous ones as well. I

HTML DOM Tree to String - Transformer NullPointerException

阅读更多关于 HTML DOM Tree to String - Transformer NullPointerException

问题 I'm trying to convert the content of an org.w3c.dom.Document object into a string. I get the Document object of the current page displayed in the JBrowser component. The most common way to convert a document dom tree into a string seems to be using a javax.xml.transform.Transformer. So I implemented this: ByteArrayOutputStream baos = new ByteArrayOutputStream(); TransformerFactory.newInstance().newTransformer().transform( new DOMSource(aDocument), new StreamResult(baos)); return baos.toString

Why css rotate messes up child's skew

阅读更多关于 Why css rotate messes up child's skew

问题 take a look this is div without parent being rotated only skew and then child skewed back. child(redbox): skewed: -40deg parent: skewed: 40deg how it looks... No if i only just rotate parent why does the red box gets messed up... child(redbox): skewed: -40deg parent: skewed: 40deg rotated: 40deg. so whyyyy does just rotating parent messes up the whole thing so confused. http://codepen.io/anon/pen/IyBvt i think skewed is getting applied after rotation or something 回答1: The way you do it, the

css加载动画

阅读更多关于 css加载动画

<div id="loading"> <i></i> </div> #loading{ display: block; position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 999; background: #fff; } #loading i { position: absolute; top: 0; left: 0; right: 0; bottom: 0; width: 50px; height: 50px; border: 4px solid #000; border-right-color: transparent; border-radius: 50%; animation: loadingAnimation 0.8s infinite Linear; margin: auto; } @keyframes loadingAnimation { from { transform: rotate(0deg); } to { transform: rotate(360deg); } } 来源： https://www.cnblogs.com/Everythingisobject/p/12024388.html

Processing a String and replacing al URL's with working links via Java

阅读更多关于 Processing a String and replacing al URL's with working links via Java

问题 How would I transform a text like the following or any other text containing an URL (http ftp etc) Go to this link http://www.google.com (ofc stack overflow already does this, on my website this is just plain text); Into this Go to this link <a href="http://www.google.com">www.google.com</a> I've come up with this method public String transformURLIntoLinks(String text){ String urlValidationRegex = "(https?|ftp)://(www\\d?|[a-zA-Z0-9]+)?.[a-zA-Z0-9-]+(\\:|.)([a-zA-Z0-9.]+|(\\d+)?)([/?:].*)?";