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问题 i'm new to all of this but i get this error when i try to install http_parser using gem: dongl_000@LENNY ~/ava-home (master) $ gem install http_parser.rb -v '0.6.0' Building native extensions. This could take a while... ERROR: Error installing http_parser.rb: ERROR: Failed to build gem native extension. c:/Ruby22-x64/bin/ruby.exe -r ./siteconf20160217-15056-1hoiyfc.rb extconf.rb creating Makefile make "DESTDIR=" clean make "DESTDIR=" generating ruby_http_parser-x64-mingw32.def make: *** No

问题 Hope someone can help - I am a novice SQL hacker (and very bad at it indeed!) I have two tables on SQL Server 2005 TABLE 1 and TABLE2: TABLE1 COL1 COL2 1 10 2 20 3 30 4 10 4 20 5 20 6 30 7 10 7 20 TABLE2 COL1 COL2 10 A 20 B 30 C COL2 in TABLE2 is a character representation of the numerical data in COL2 TABLE1. I hope this is understandable? I have worked out how to select COL1 and COL2 from TABLE1 and concatenate the results to show this: COL1 COL2Concat 1 10 2 20 3 30 4 10, 20 5 20 6 30 7 10

问题 I don't know how it happens that the option named "Restrict where this project can be run" from Jenkins seems to allow only a single value inside "Label Expression" field. I tried lots of combinations in order to add more than one label and I wasn't able to find any way to put two. I need to mention that I need AND between these labels. The irony is that this option even has an Info button which loads some documentations, which is missing to say how an expression is supposed to look like.

问题 I have a spectrum in a fits file that I generated with Iraf. The wavelength axis is encoded in the header as: WAT0_001= 'system=multispec' WAT1_001= 'wtype=multispec label=Wavelength units=angstroms' WAT2_001= 'wtype=multispec spec1 = "1 1 2 1. 2.1919422441886 4200 0. 452.53 471' WAT3_001= 'wtype=linear' WAT2_002= '.60 1. 0. 3 3 1. 4200.00000000001 1313.88904209266 1365.65012876239 ' WAT2_003= '1422.67911152069 1479.0560707956 1535.24082980747 1584.94609332243' Is there an easy way to load

问题 I'm new to sql and am struggling to make a view. This works and pulls in the correct data I need as a table, but when I try it as a view I get the error: SQL text cannot be represented in the grid pane and diagram pane. SELECT [Data_Collector_ID], [Batch_Info_ID], [AssetTag], [DateTimeStamp], [Dust_Collector_DP] FROM ( SELECT [Data_Collector_ID], [Batch_Info_ID], [AssetTag], [DateTimeStamp], [Dust_Collector_DP], ROW_NUMBER() OVER (PARTITION BY [Batch_Info_ID] ORDER BY [DateTimeStamp] DESC) rn

问题 i'm new to all of this but i get this error when i try to install http_parser using gem: dongl_000@LENNY ~/ava-home (master) $ gem install http_parser.rb -v '0.6.0' Building native extensions. This could take a while... ERROR: Error installing http_parser.rb: ERROR: Failed to build gem native extension. c:/Ruby22-x64/bin/ruby.exe -r ./siteconf20160217-15056-1hoiyfc.rb extconf.rb creating Makefile make "DESTDIR=" clean make "DESTDIR=" generating ruby_http_parser-x64-mingw32.def make: *** No

问题 I am trying to use reflection to set a pointer. elasticbeanstalk.CreateEnvironmentInput has a field SolutionStackName which is of type *string . I am getting the following error when I try to set any value: panic: reflect: call of reflect.Value.SetPointer on ptr Value Here is my code: ... newEnvCnf := new(elasticbeanstalk.CreateEnvironmentInput) checkConfig2(newEnvCnf, "SolutionStackName", "teststring") ... func checkConfig2(cnf interface{}, key string, value string) bool { log.Infof("key %v,

问题 df <-data.frame(x=c(1:5),y=c(letters[1:5])) Let's say I want to modify the last row, update.row<-filter(df,x==5) %>% mutate(y="R") How do I update this row into the data.frame ? The only way, I found albeit a strange way is to do an anti-join and append the results. df <-anti_join(df,update.row,by="x") %>% bind_rows(update.row) However, it seems like a very inelegant way to achieve a simple task. Any ideas are much appreciated... 回答1: If you are insistant on dplyr , perhaps df <-data.frame(x

问题 I usually comment my functions using multi-line docstrings with """, as mentioned in : https://www.python.org/dev/peps/pep-0257/ def func1(x): """ This function does ... """ ... But what is the best way to comment a lambda function ? I hesitate between : # This function does ... func2 = lambda x: ... or : func2 = lambda x: ... """ This function does ... """ or else ? 回答1: tbh, even assigning a lambda to a variable seems unpythonic to me. if it needs a name, define it as a regular function.

问题 I was trying to solve this problem, and I gave up, and found the solution below, although I do not understand how the solution works, or why it works. Any in-depth solution would be deeply appreciated. Question: Given s1 , s2 , s3 , find whether s3 is formed by the interleaving of s1 and s2 . For example, Given: s1 = "aabcc" s2 = "dbbca" When s3 = "aadbbcbcac" , return true. When s3 = "aadbbbaccc" , return false. Solution: public static boolean isInterleave(String s1, String s2, String s3) {