r - How to find the sd of two columns of matrix? -



r - How to find the sd of two columns of matrix? -

if have matrix contains 6 variable,if want find sd of (col1 , col1), (col1 , col2), (col1 , col6),......(col6 , col6), , homecoming 6*6 matrix. function should use? (sd: standard deviation)

thanks much.

first, create sample info

set.seed(1) m <- replicate(6, rnorm(5)) # create matrix 6 columns

you can utilize expand.grid possible combinations, loop through combinations using apply. finally, wrap result in matrix

matrix(apply(expand.grid(1:6, 1:6), 1, function(x) sd(m[, x])), ncol=6) # [,1] [,2] [,3] [,4] [,5] [,6] # [1,] 0.9060766593 0.7805859575 1.187979366 0.7326776974 1.0258159472 0.8334359580 # [2,] 0.7805859575 0.6305829418 1.095413861 0.5692800481 0.9169484342 0.6960691132 # [3,] 1.1879793664 1.0954138606 1.413152368 1.0695148355 1.2806974048 1.1228262280 # [4,] 0.7326776974 0.5692800481 1.069514836 0.4382343292 0.8814506207 0.7057912762 # [5,] 1.0258159472 0.9169484342 1.280697405 0.8814506207 1.1324043901 0.9556076127 # [6,] 0.8334359580 0.6960691132 1.122826228 0.7057912762 0.9556076127 0.6643807746

r matrix transpose

Comments

Post a Comment

Popular posts from this blog

java Multi query from Mysql using netbeans -

java Multi query from Mysql using netbeans - i have java code retrieve info mysql appropriate code in netbeans.the code below. want multi query such illustration finding total number of products , on.could help me please. in advance import java.sql.*; public class javamysqlselectexample { public static void main(string[] args) { seek { string mydriver = "com.mysql.jdbc.driver"; string myurl = "jdbc:mysql://localhost/sample"; class.forname(mydriver); connection conn = drivermanager.getconnection(myurl, "root", "mypasscode1"); string query = "select * products"; statement st = conn.createstatement(); resultset rs = st.executequery(query); while (rs.next()==true) { int code = rs.getint("code"); string productname = rs.getstring("product_name"); string producttype = rs.getstring("product_type"); system.out.format(" %d, %s, %s\n", code, pr
Read more

c# - DotNetZip fails with "stream does not support seek operations" -

c# - DotNetZip fails with "stream does not support seek operations" - i using dotnetzip in c# unzip stream follows: public static void unzipfromstream(stream stream, string outdir) { //omit seek grab block using (zipfile zip = zipfile.read(stream)){ foreach (zipentry e in zip){ e.extract(outdir, extractexistingfileaction.overwritesilently); } } } stream obtained using webclient client = new webclient(); stream fs = client.openread(url); however, got next exception exception during extracting zip stream system.notsupportedexception: stream not back upwards seek operations. @ system.net.connectstream.get_position() @ ionic.zip.zipfile.read(stream zipstream, textwriter statusmessagewriter, encoding encoding, eventhandler`1 readprogress) on server side(asp.net mvc 4), returning filepathresult or filestreamresult both caused exception. should obtain stream differently on client side? or how create server homec
Read more

c++ - StartServiceCtrlDispatcher don't can access 1063 error -

c++ - StartServiceCtrlDispatcher don't can access 1063 error - i write on c++ service , have error, , don't can fixed it. my service main function int main (int argc, tchar *argv[]) {dword f; for(int i=0;i<113;i++) f = getlasterror(); servicepath = lptstr(argv[0]); outputdebugstring(_t("my sample service: main: entry")); //installservice(); service_table_entry servicetable[] = { {service_name, (lpservice_main_function) servicemain}, {null, null} }; // startservice(); if(!startservicectrldispatcher(servicetable)) { f = getlasterror(); //addlogmessage("error: startservicectrldispatcher"); } else if( memcmp(argv[argc-1],"install",7)) { installservice(); } else if( memcmp(argv[argc-1],"remove",6)) { removeservice(); } else if( memcmp(argv[argc-1],"start",5)) { startservice(); } else if( memcmp(argv[argc-1],"stop",4))
Read more