concat

问题 I need to be able to combine this into one function. There are 2 separate arrays... {this.state.telephoneType.map((telephoneType, ttidx) => ())} and... {this.state.telephone.map((telephone, tidx) => ())} Basically, this is because I have a button which concatenates the 2 functions and it has to be outside the row class (MDBRow) so the UI doesn't break. <MDBRow className="grey-text no-gutters my-2"> {this.state.telephoneType.map((telephoneType, ttidx) => ( <MDBCol md="4" className="mr-2">

问题 I am using pandas in python. I have several Series indexed by dates that I would like to concat into a single DataFrame, but the Series are of different lengths because of missing dates etc. I would like the dates that do match up to match up, but where there is missing data for it to be interpolated or just use the previous date or something like that. What is the easiest way to do this? 回答1: If the Series are in a dict data , you need only do: frame = DataFrame(data) That puts things into a

问题 I have this code which works good for this array: ['45', '30', '50', '1']. function penalty(a_list) { return a_list.sort((a, b) => a - b).join(''); } for example: given that a_list is ['45', '30', '50', '1'] the smallest possible string will be '1304550' which is right, but what if a_list is ['32', '3'] given this current code I will get '332' which is not correct because '323' is the smallest possible string. Hope that helps. 回答1: You could take the concatinated values of a and b and the

问题 When this code runs, it gets the content of a webpage. I wanted to concatenate that entire string rather than printing it to the console but when I uncomment the two lines in the code below, System.out.println(inputLine); prints nothing (but it worked with the line below commented) and the value fileText = null , where does this error come from? import java.net.*; import java.io.*; public class URLReader { public static void main(String[] args) throws Exception { URL oracle = new URL("http:/

问题 I am using two-tier chained select boxes on my webpage to filter data...I am having problem with my query for the second select values... table: id name cat loc 1 ABC resort mall road 2 BCD banquet hall mall road 3 CDE farm house, banquet hall pakhowal road 4 DEF hotel ferozpur road 5 FEZ hotel fountain chowk 6 ZEX resort mall road I have two select boxes in which first one is for DISTINCT cat values...which is working perfectly for me... Query i am using is: select distinct cat from (select

问题 I am using two-tier chained select boxes on my webpage to filter data...I am having problem with my query for the second select values... table: id name cat loc 1 ABC resort mall road 2 BCD banquet hall mall road 3 CDE farm house, banquet hall pakhowal road 4 DEF hotel ferozpur road 5 FEZ hotel fountain chowk 6 ZEX resort mall road I have two select boxes in which first one is for DISTINCT cat values...which is working perfectly for me... Query i am using is: select distinct cat from (select

问题 I have a function that has an array with the months of the year. In my function i delete some words of the month name. My function is var array = ['Enero', 'Febrero', 'Marzo', 'Abril', 'Mayo', 'Junio', 'Julio', 'Agosto', 'Septiembre', 'Octubre', 'Noviembre', 'Diciembre']; for (var i = 0; i < array.length; i++) { var result = [array[i].slice(0, 3)]; console.log(result); } The result is ["Ene"] ... ["Dic"] But i want have some like this: ["Ene", ... , "Dic"] How i can concat the result in a

问题 As per my understanding, when + operator is used with two string literals, concat method is invoked to produce the expected string. Example - String s = "A" + "B"; When there is null in place of one literals as below then it is generating below output. I am confused here - why it is not throwing NullPointerException ? String str = null + "B"; System.out.println(str); Output: nullB 回答1: why it is not throwing NullPointerException . Because, string concatenation applies string conversion

问题 i am having issue, to concat video, it looses the audio sync and audio started from previous video. i have tried below two link/so answer by Mulvya, but none of them work :( here is the code i am trying: 1: re-encode file a (1): ffmpeg.exe -i "f:\1.avi" -af apad -vf scale=1280:720 -crf 15.0 -vcodec libx264 -acodec aac -ar 48000 -b:a 192k -coder 1 -rc_lookahead 60 -threads 0 -shortest -avoid_negative_ts make_zero -fflags +genpts 01.mp4 2: re-encode file b (2): ffmpeg.exe -i "f:\2.mp4" -af apad

问题 I have a daframe with a series of period 1 month and frequency one second. The problem the time step between records is not always 1 second. time c1 c2 2013-01-01 00:00:01 5 3 2013-01-01 00:00:03 7 2 2013-01-01 00:00:04 1 5 2013-01-01 00:00:05 4 3 2013-01-01 00:00:06 5 6 2013-01-01 00:00:09 4 2 2013-01-01 00:00:10 7 8 Then I want to create an empty dataframe with the same columns and for the whole period corrected. That means with as many records as seconds has a month. This empty dataframe