我有一个由两列组成的数据集：“species_id”和“count”。有些物种是重复的，但命名不同，例如：BROC和broc。我想将这两行合并为一行，并将它们的计数值相加。
目前，我有：
species_id count
BRBL 109
BROC 16
broc 7
BRSP 16
我想要：
species_id count
BRBL 109
BROC 23
BRSP 16
非常感谢！任何帮助将不胜感激。
答案 0 :(得分：1)
假设名称的差异仅为大写/小写，则可能会起作用：
library(dplyr)
df <- data_frame(species_id = c("BROC", "broc"), count = c(16, 7)) #sample data
df %>% mutate(species_id = toupper(species_id)) %>%
group_by(species_id) %>% summarise(count = sum(count))
如果除了大小写之外还有差异，那么在分组之前你可能需要使用正则表达式和其他数据清理技术，但这个想法应该是相同的。
答案 1 :(得分：0)
您可以使用
func showFooter(show: Bool) {
DispatchQueue.main.safeAsync {
if show {
let loadingFooter = UIActivityIndicatorView(activityIndicatorStyle: .gray)
UIApplication.shared.keyWindow?.addSubview(loadingFooter)
loadingFooter.startAnimating()
loadingFooter.snp.makeConstraints { make in
make.centerX.equalTo(self.view.snp.centerX)
make.height.equalTo(20)
make.bottom.equalTo(self.view.snp.bottom).inset(49)
}
} else {
UIApplication.shared.keyWindow?.subviews.forEach { ($0 as? UIActivityIndicatorView)?.removeFromSuperview() }
}
}
}
public struct ConstraintViewDSL: ConstraintAttributesDSL {
public func makeConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
ConstraintMaker.makeConstraints(item: self.view, closure: closure)
}
}
public extension ConstraintView {
public var snp: ConstraintViewDSL {
return ConstraintViewDSL(view: self)
}
}
示例：
Fatal Exception: NSGenericException
0 CoreFoundation 0x182609d04 __exceptionPreprocess
1 libobjc.A.dylib 0x181858528 objc_exception_throw
2 CoreFoundation 0x182609c4c -[NSException initWithCoder:]
3 Foundation 0x183118d18 -[NSLayoutConstraint _setActive:mutuallyExclusiveConstraints:]
4 Foundation 0x183119004 __55+[NSLayoutConstraint _addOrRemoveConstraints:activate:]_block_invoke
5 Foundation 0x182f3b59c -[NSISEngine withBehaviors:performModifications:]
6 Foundation 0x183118ed4 +[NSLayoutConstraint _addOrRemoveConstraints:activate:]
7 SnapKit 0x10281b54c specialized static ConstraintMaker.makeConstraints(item : LayoutConstraintItem, closure : (ConstraintMaker) -> ()) -> () (ConstraintMaker.swift:272)
8 SnapKit 0x10281e578 ConstraintViewDSL.makeConstraints((ConstraintMaker) -> ()) -> () (ConstraintViewDSL.swift)
9 Zattini 0x101341fc0 specialized UIViewController.(showFooter(show : Bool) -> ()).(closure #1) (UIViewController+Extensions.swift:140)
10 Zattini 0x101340dd8 UIViewController.showFooter(show : Bool) -> () (UIViewController+Extensions.swift:14)
11 Zattini 0x101340f10 @objc UIViewController.showFooter(show : Bool) -> () (UIViewController+Extensions.swift)
12 Zattini 0x10132f5c4 ProductListControllerZattiniProductListDelegate (ProductListController.swift:197)
13 Zattini 0x1013881cc ProductListViewModel.loadMoreProducts() -> () (ProductListViewModel.swift:159)
14 Zattini 0x101331858 specialized ProductListController.scrollViewDidScroll(UIScrollView) -> () (ProductListController.swift:192)
15 Zattini 0x10132de80 @objc ProductListController.scrollViewDidScroll(UIScrollView) -> () (ProductListController.swift)
16 UIKit 0x18bd4270c -[UIScrollView(UIScrollViewInternal) _notifyDidScroll]
17 UIKit 0x18ba5f090 -[UIScrollView setContentOffset:]
18 UIKit 0x18bd46398 -[UIScrollView(UIScrollViewInternal) _adjustContentOffsetIfNecessary]
19 UIKit 0x18ba99cc4 -[UIScrollView setBounds:]
20 UIKit 0x18ba99580 -[UICollectionView setBounds:]
21 UIKit 0x18bd1dcf4 -[UIView(Geometry) _applyISEngineLayoutValuesToBoundsOnly:]
22 UIKit 0x18ba585c8 -[UIView(Geometry) _resizeWithOldSuperviewSize:]
23 UIKit 0x18c5e4b48 -[UIScrollView(_UIOldConstraintBasedLayoutSupport) _resizeWithOldSuperviewSize:]
24 CoreFoundation 0x1824e3a6c -[__NSArrayM enumerateObjectsWithOptions:usingBlock:]
25 UIKit 0x18ba46af8 -[UIView(Geometry) resizeSubviewsWithOldSize:]
26 UIKit 0x18bb2f018 -[UIView(AdditionalLayoutSupport) _is_layout]
27 UIKit 0x18bd21228 -[UIView(Hierarchy) _updateConstraintsAsNecessaryAndApplyLayoutFromEngine]
28 UIKit 0x18ba3e304 -[UIView(CALayerDelegate) layoutSublayersOfLayer:]
29 QuartzCore 0x1865f7ec8 -[CALayer layoutSublayers]
30 QuartzCore 0x1865fbfa8 CA::Layer::layout_if_needed(CA::Transaction*)
31 UIKit 0x18ba530a8 -[UIView(Hierarchy) layoutBelowIfNeeded]
32 UIKit 0x18bae8d7c -[UINavigationController _layoutViewController:]
33 UIKit 0x18bae644c -[UINavigationController _layoutTopViewController]
34 UIKit 0x18bdcf3c8 __105-[UINavigationController _repositionPaletteWithNavigationBarHidden:duration:shouldUpdateNavigationItems:]_block_invoke
35 UIKit 0x18bdcf0a8 -[UINavigationController _repositionPaletteWithNavigationBarHidden:duration:shouldUpdateNavigationItems:]
36 UIKit 0x18bae5a78 -[UINavigationController _updateBarsForCurrentInterfaceOrientation]
37 UIKit 0x18bb67cac -[UITabBarController _updateLayoutForStatusBarAndInterfaceOrientation]
38 CoreFoundation 0x18259c0bc __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__
39 CoreFoundation 0x18259b65c _CFXRegistrationPost
40 CoreFoundation 0x18259b3c0 ___CFXNotificationPost_block_invoke
41 CoreFoundation 0x1826189c4 -[_CFXNotificationRegistrar find:object:observer:enumerator:]
42 CoreFoundation 0x1824d20c0 _CFXNotificationPost
43 Foundation 0x182ef3498 -[NSNotificationCenter postNotificationName:object:userInfo:]
44 UIKit 0x18bf3f10c -[__UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:]
45 UIKit 0x18c6ba4b8 __82-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]_block_invoke
46 UIKit 0x18c6ba35c -[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]
47 UIKit 0x18c42c294 __125- [_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke
48 UIKit 0x18c5c30ac _performActionsWithDelayForTransitionContext
49 UIKit 0x18c42c144 -[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]
50 UIKit 0x18c2122d8 -[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:]
51 UIKit 0x18c0b4d68 -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:]
52 FrontBoardServices 0x184cb620c __80-[FBSSceneImpl updater:didUpdateSettings:withDiff:transitionContext:completion:]_block_invoke.362
53 libdispatch.dylib 0x181f8d048 _dispatch_client_callout
54 libdispatch.dylib 0x181f946c8 _dispatch_block_invoke_direct$VARIANT$mp
55 FrontBoardServices 0x184ce99f4 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__
56 FrontBoardServices 0x184ce9698 -[FBSSerialQueue _performNext]
57 FrontBoardServices 0x184ce9c34 -[FBSSerialQueue _performNextFromRunLoopSource]
58 CoreFoundation 0x1825b22e8 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
59 CoreFoundation 0x1825b2268 __CFRunLoopDoSource0
60 CoreFoundation 0x1825b1af0 __CFRunLoopDoSources0
61 CoreFoundation 0x1825af6c8 __CFRunLoopRun
62 CoreFoundation 0x1824cffb8 CFRunLoopRunSpecific
63 GraphicsServices 0x184367f84 GSEventRunModal
64 UIKit 0x18baa42f4 UIApplicationMain
65 Zattini 0x101113a84 main (AppDelegate.swift:21)
66 libdyld.dylib 0x181ff256c start
上面的代码会导致
library(dplyr)
df = df %>%
mutate(species_id = tolower(as.character(species_id))) %>%
group_by(species_id) %>%
summarise(total = sum(count)) %>%
ungroup()