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问题 i have the following code to compute minimum and maximum values of a list in order to save memory efficiency x_min = float('+inf') x_max = float('-inf') for p in points_in_list: x_min = min(x_min, p) x_max = max(x_max, p) where points_in_list is a (large) list of numbers. I wish to know if there is a method to compute with a List Comprehensions the min and max value and saving the memory. 回答1: I'm a big fan of generators and comprehensions, but in this case it seems they are not the right way

问题 I installed the Xcode-11-beta along with macOS 10.15 beta. At first I can play with SwiftUI preview normally. But after I tried to move the Xcode-beta from the ~/Downloads directory where I initially installed it, to /Applications , the preview can't work. Here is the error: So I moved it back to ~/Downloads , hoping things will go well as before. But it gives the same error. After this, I reinstalled it and I still got this error. Can anyone help me fix it? The content of diagnostics report

问题 It used to be possible to put text on plot margins by turning off clipping. In ggplot2_2.2.0 this doesn't seem to be possible anymore in plots that use facets (but still works if no facets are used). I've posted an issue here but it has not been addressed yet. Any ideas for workarounds in the meantime would be greatly appreciated! Here is a minimal (non-)working example: library(ggplot2) library(grid) df.plot = data.frame(x = 1, y = 1, facet = 'facet', stringsAsFactors = F) df.text = data

问题 I want to change the auth process to use another view template. E.g. instead of resources/views/auth/register.blade.php it shall be used resources/views/register.blade.php . But I struggle to find the code where this view is called. The only place I found was in app/Services/Register but only if the validators fails. I need the place when the view is called per default. 回答1: In AuthController, you can overwrite the method getRegister() method like this : public function getRegister() { return

问题 I am trying to read and write jpegs wth Adobe RGB colorspace in OpenCV. OpenCV assumes the jpeg has sRGB colorspace and when displaying or writing to file, the image loses some of its color intensity. I found this intensity loss was due to colorspace difference by answers given to my previous question. Is there anyway I can make OpenCV to read Adobe RGB colorspace without casting it to sRGB? 回答1: Some information that is hopefully useful for anyone looking for a work-around for dealing with

问题 With the update react native to version 0.63 , new components have appeared. Can someone more experienced explain how the Pressable differs from the TouchableOpacity and when it is better to use them. 回答1: Pressable was a new introduction to RN 0.63, prior to that,Touchable Opacity was the most common used Component to wrap a component or simliar components. Both their basic functionalities are same, to make a text/image clickable and user interactive. But with Pressable you get to access a

问题 I have tried several solutions specified in other answers, like experimenting with different user agents (Chrome, safari etc), and getting HTML directly using HTTPClient and BufferedReader, but none of them work. How do I make the Android output similar as a web output? Here is the web output I am looking for; (View page source of https://finance.yahoo.com/quote/AAPL/financials?p=AAPL for full output - this basically contains the AJAX tab named "Quarterly" which contains a table . I need to

问题 I have tried several solutions specified in other answers, like experimenting with different user agents (Chrome, safari etc), and getting HTML directly using HTTPClient and BufferedReader, but none of them work. How do I make the Android output similar as a web output? Here is the web output I am looking for; (View page source of https://finance.yahoo.com/quote/AAPL/financials?p=AAPL for full output - this basically contains the AJAX tab named "Quarterly" which contains a table . I need to

问题 I have 2 files, each file has one column with multiple rows and the rows of each file are the same. How can I join the 2 files' columns together so that the final result file has two columns coming from file1 and file2? For example, file1 is: 1 2 3 and file2 is: a b c and the expected output is: 1 a 2 b 3 c 回答1: Just use the paste command. Use it like this : paste file1 file2 来源： https://stackoverflow.com/questions/12361977/how-to-join-columns-of-two-files-in-unix-system

问题 I've got a big database with analytics data written in JSON. I want to filter out rows with incorrect data: invalid json (some rows has something like that: '{"hello": "world' some attributes is not array so it would take '{"products": [1,2,3]}' and will leave out the '{"products": 1}' I want to do something like that: select * from analytics where (is_correct_json(json::json)) and (is_array(json::json->>'products')) How can I achieve that? 回答1: This is another good example why choosing the