[ad_1] Why not extract that column and take the mean?? > m <- matrix(1:10, nrow=5) > mean(m[,1]) # mean of the first column [1] 3 # mean of the second column conditional on values of column 3 are bigger than 4 > mean(x[x[,3]>4,2]) [1] 5 I don’t understand what you mean with “…second column where … Read more
[ad_1] After changing the package name application giving error ” java.lang.NullPointerException: Attempt to get length of null array” [duplicate] [ad_2] solved After changing the package name application giving error ” java.lang.NullPointerException: Attempt to get length of null array” [duplicate]
[ad_1] Something like this? char foo; while(true) { cout<<“again? “; cin<<foo; if(foo == ‘N’ || foo ==’n’) break; else { //Do important stuff } } 1 [ad_2] solved Yes/No always pick the first option (C++) [duplicate]
[ad_1] Assuming your ArrayList is this: List<String[]> arrayList = new ArrayList<>(); arrayList.add(new String[]{“R111″,”Red”,”50000″}); arrayList.add(new String[]{“R123″,”Blue”,”50000″}); you can do something like: for (Iterator<String[]> iterator = arrayList.iterator();iterator.hasNext();) { String[] stringArray = iterator.next(); if(“R111”.equals(stringArray[0])) { iterator.remove(); } } You can safely remove an element using iterator.remove() while iterating the ArrayList. Also see The collection Interface. An alternative shorter … Read more
[ad_1] You can go for the following two solutions: grep -ie ‘b[^e]’ input_file.txt or grep -ie ‘b.’ input_file.txt | grep -vi ‘be’ The first one does use regex: ‘b[^e]’ means b followed by any symbol that is not e -i is to ignore case, with this option lines containing B or b that are not … Read more
[ad_1] CSS Animation Wrap both images in a block element that has: position:relative Set both images to position:absolute Make 2 @keyframes and animation: 10s infinite alternate Assign a @keyframe animation to each image. The 2 properties being animated is opacity and z-index (z-index is only on 2 frames because there’s only 2 states really lower … Read more
[ad_1] You can create a recursive function, public void loopThrough(List<Region> regions) { for(Region region : regions) { if(region.hasSubRegion()) { loopThrough(region.getSubRegions()); } } } 1 [ad_2] solved Iterate through a possibly infinite amount of nested ArrayLists
[ad_1] With awk: awk ‘BEGIN{FS=”[ ,]”; OFS=”,”} {for (i=2; i<=NF; i++) print $i,$1}’ file Output: foo,ted bar,ted zoo,ted ket,john ben,john See: 8 Powerful Awk Built-in Variables – FS, OFS, RS, ORS, NR, NF, FILENAME, FNR [ad_2] solved How can I manipulate text in bash? [closed]
[ad_1] You have to achive this through the tileMode. put this image file on your drawable folder then drawable/dot_background.xml: <?xml version=”1.0″ encoding=”utf-8″?> <bitmap xmlns:android=”http://schemas.android.com/apk/res/android” android:src=”https://stackoverflow.com/questions/48047303/@drawable/actual_pattern_image” android:tileMode=”repeat” /> then set this xml as background on your view hope this will help help you [ad_2] solved How to fill with dots in a view? [closed]
[ad_1] When you iterate through a list in Python, any modifications to the list you are iterating through will have an effect on the for loop. For example, take this code: my_list = list() my_list.append(“hello”) for element in my_list: my_list.append(“hello”) This code will run forever, because my_list keeps growing in size. With your code, you … Read more
[ad_1] All properties are created manually using the @property declaration. In the latest objective-C you don’t need to add the @synthesize declaration any more. As for IBOutlets, they don’t do anything. In fact, IBOutlets are expanded to nothing. They are just passive tags so that Interface Builder can locate the properties that it can associate … Read more
[ad_1] I forgot almost everything about bash scripting. but I think you can do something like this. files=(file1 file2 file3 file4) for i in `seq 4` do j=$(($i-1)) f[$j]=`cat ./temp/${files[$i]} | awk ‘{print $2}’ ` done for i in `seq 0 1799` do sum=0 rowValue=0 for j in `seq 0 3` do fileContent=(${f[$j]}) rowValue=`echo ${fileContent[$i]} … Read more
[ad_1] Use this query. if(isset($_POST[‘txtSpace’])) { $choice_spc_port = $_POST[‘txtSpace’]; } if(isset($_POST[‘txtLocation’])) { $choice_loc = $_POST[‘txtLocation’]; } $insert = mysql_query(“INSERT INTO dbForm (db_space_portion, db_animal_location) VALUES (‘{$choice_spc_port}’, ‘{$choice_loc}’)”); [ad_2] solved Undefined Index in php (I’ve searched all over internet, and stackoverflow, tried almost everything) [duplicate]
[ad_1] Use this regex: var yourString=”hello word:1235 tsfa”; var patt1=/:(\w*)/; alert(yourString.match(patt1)[1]); working jsFiddle [ad_2] solved Get value from a JS string [closed]
[ad_1] Seems you escape brackets wrong: Try this: string regexTemplate = @”TRY MOVIE YES \[Bat2man WIN\]”; or string regexTemplate = “TRY MOVIE YES \\[Bat2man WIN\\]”; [ad_2] solved Regular expressions C# [closed]