topic description data source, the diamonds, preview of the ggplot2 package is as follows mean(diamonds[which(diamonds$cut== Ideal ),]$price) problem description 1, is there a more convenient way to calculate the mean value of the y-axis of a ba...
Business: clustering members according to member RFM data. data: CSV,40MB, is greater than 100000 rows. problem: error using factoextra package hkmeans function: Error: cannot allocate vector of size 8143.6 Gb ...
for example grep 20180906834424 test.log | awk {print $2} the above code will produce a result. How can I use this result as a parameter of grep to re-search the test.log file? grep 20180906834424 test.log | awk {print $2} | xargs grep PATT...
how to sort and output one-dimensional arrays by building a binary tree I have built a binary tree, but the result of solving the binary tree is not what I want. What I want is an ordered one-dimensional array: data $nodes = array(8,3,10,1,6,14,4,7...
refer to the tutorial: http: www.runoob.com linux n., such as the title. locaohost cannot be accessed, but ping can be reached searched, it is useless to open port 80 After , modify the domain name and modify the etc host etc hosts file. The dom...
PageTagMapModel.getPageTagMapNum ({tag: single._id, status: normal }) returns the page_num found by the mongoose query, but if three lines of comments are used in the code, there is no page_num attribute in the resulting data. You can use = to assig...
there are two tables, one document table and one case table document (id,case_num,document_name) case (id,case_num,case_name,status) the case_num of the document table corresponds to the case_num of multiple case tables the case_num format of the ...