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Hi I am having difficulty with eigen() on R-devel_2006-01-05.tar.gz Specifically, in R-2.2.0 I get expected behaviour: > eigen(matrix(1:100,10,10),FALSE,TRUE)$values [1] 5.208398e+02+0.000000e+00i -1.583980e+01+0.000000e+00i [3] -4.805412e-15+0.000000e+00i 1.347691e-15+4.487511e-15i [5] 1.347691e-15-4.487511e-15i -4.269863e-16+0.000000e+00i [7] 1.364748e-16+0.000000e+00i -1.269735e-16+0.000000e+00i [9] -1.878758e-18+5.031259e-17i -1.878758e-18-5.031259e-17i > The same command gives...

...mis-behaviour of the function 'eigen' in 'base', for the following input matrix: A <- matrix(c(2,3,4,-1,3,1,1,-2,0),3,3) eigen(A) I obtain the following results, which are incorrect for eigenvalues and eigenvectors 2 and 3 (incorrect imaginary portions): $values [1] 3+0.000000e+00i 1+1.869518e-08i 1-1.869518e-08i $vectors [,1] [,2] [,3] [1,] -0.5345225+0i 4.720910e-17+2.643897e-09i 4.720910e-17-2.643897e-09i [2,] -0.2672612+0i 7.071068e-01+0.000000e+00i 7.071068e-01+0.000000e+00i [3,] -0.8017837+0i 7.071068e-01-2.6438...

...ion. Type `demo()' for some demos, `help()' for on-line help, or `help.start()' for a HTML browser interface to help. Type `q()' to quit R. [Previously saved workspace restored] > polyroot(c(6,-5,1)) [1] 2+1.615587e-27i 3-1.615587e-27i > polyroot(c(0,0,0,1)) [1] 0+0.000000e+00i 0+0.000000e+00i 3-1.615587e-27i > polyroot(c(4,-4,1)) [1] 2+1.110223e-16i 2-1.110223e-16i > polyroot(c(0,0,0,1)) [1] 0+0.000000e+00i 0+0.000000e+00i 2-1.110223e-16i > Thank you for your attention. Best regards, Chyi-Hung Hsu -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-....

....0121055i 0.0141203+0.6139178i [,4] [1,] 1.344998+1.231298i [2,] -0.190861+1.817582i [3,] 1.855617-1.244282i [4,] -1.735007+0.725572i > b <- svd(a) > with(b, u %*% t(Conj(u))) [,1] [,2] [1,] 1.000000e+00+0.000000e+00i 9.971272e-18-1.092774e-16i [2,] 9.971272e-18+1.062857e-16i 1.000000e+00-0.000000e+00i [3,] -9.500311e-17+3.729126e-17i -1.319715e-16-3.354759e-16i [4,] 1.585713e-16+2.581553e-16i 2.988332e-17+1.814683e-16i [,3] [,4] [1,] -9.500311e-17-2.546774...

...rom an online temperature database into dates and time that R recognizes. I've tried as.Date, as.POSIXlt and strptime the problem is that the database has put a T between the numbers and R will not accept any conversions. currently it sees the date as a factor with the format as 1981-01-02T08:00I would like to keep only the year and month, but my primary focus is to get R to recognize it as a date. Thank you for your help. cheers,Marjolein [[alternative HTML version deleted]]

Hi, > 1e10+5i [1] 1e+10+0e+00i > Im(1e10+5i) [1] 5 maybe little better... --- R-3.5.1.orig/src/main/complex.c 2018-03-26 07:02:25.000000000 +0900 +++ R-3.5.1/src/main/complex.c 2018-07-10 12:50:42.523874767 +0900 @@ -381,6 +381,7 @@ r->i = fround(pow10 * x->i, digits)/pow10; } else { digits = (dou...

...1\00\00\00PrinterDriverData\5CTrayFor mMap\00\03\00\00\00\18\00\00\00Roll\ 00\00\00\00\00Sheet\00\00\00\00\00\00\00\00\00\00\01\00\00\00DsSpooler\5 CprinterName\00\01\00\00\00\16\00\00 \00n\000\001\001\001\00-\001\000\005\000\00\00\00\01\00\00\00DsSpooler\5 CshortServerName\00\01\00\00\00\14\0 0\00\00I\00M\00N\00O\00L\00A\00L\00P\000\00\00\00\01\00\00\00DsSpooler\5 CserverName\00\01\00\00\00&\00\00\00 m\00o\00m\00u\00s\00.\00g\00o\00m\00r\00.\00m\00m\00s\00.\00g\00o\00v\00 \00\00\01\00\00\00DsSpooler\5CuNCNam e\00\01\00\00\00@\00\00\00\5C\00\5C\00m\00o\00m\00u\00s\00.\00g\00o\00m\ 00r\00.\00m...

...precision? The imaginary part of 0 looks a bit odd when log10(real/imag) >=~ getOption("digits"), but I'm not sure it is awful. Some people might expect the same number of significant digits in the two parts. > 1e7+4i [1] 10000000+0i > 1e7+5i [1] 10000000+0i > 1e10 + 1000i [1] 1e+10+0e+00i > getOption("digits") [1] 7 > options(digits=4) > 1e4+4i [1] 10000+0i > 1e7+1000i [1] 10000000+0i > version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status Under d...

...t; Expected: "3+4i" /home/jay/llvm/clang-3.0rc3.src/unittests/AST/APValueTest.cpp:73: Failure Value of: GetDiagnosticOutput(APValue( APFloat(APFloat::IEEEdouble, "3.2"), APFloat(APFloat::IEEEdouble, "5.7"))) Actual: "" Expected: "3.200000e+00+5.700000e+00i" /home/jay/llvm/clang-3.0rc3.src/unittests/AST/APValueTest.cpp:80: Failure Value of: GetDiagnosticOutput(APValue(V, array_lengthof(V))) Actual: "" Expected: "[3, 4, 5]" [ FAILED ] APValue.Diagnostics (1 ms) [----------] 1 test from APValue (16 ms total) [----------] Gl...

If I have matrics as follows: > a <- c(1,1,0,0) > b <- c(4,4,0,0) > c <- c(3,5,5,6) How can I use R code to solve the equation ax^2+bx+c=0. thanks! yuying shi [[alternative HTML version deleted]]

...version of qr.coef, with the two lines in question changed as above (and no other modifications). Examples: > A <- matrix(rnorm(9),3,3) > B <- matrix(rnorm(9),3,3) > solve(A+1i*B,A+1i*B) [,1] [,2] [,3] [1,] 1.000000e+00+0.000000e+00i -1.853360e-17-1.199306e-17i 0+0i [2,] 2.338819e-17-1.192988e-19i 1.000000e+00+1.155338e-20i 0+0i [3,] -6.940188e-18+1.120842e-17i 5.188659e-17-3.226848e-17i 1+0i > qr.solve(A+1i*B,A+1i*B) [,1] [,2] [1,] 1.000000e-00-2.583088e-16i 1.000000e-...

Good day, LLVMers! We are starting on our third (and hopefully last) round of testing for LLVM 3.0. Please visit: http://llvm.org/pre-releases/3.0/rc3/ for the sources. There are also binaries for Darwin up there, with more to come during the week. Please build this release candidate, test it out on your projects, and let us know if you find any regressions from the 2.9 release. Please keep

...quot; > /home/jay/llvm/clang-3.0rc3.src/unittests/AST/APValueTest.cpp:73: Failure > Value of: GetDiagnosticOutput(APValue( APFloat(APFloat::IEEEdouble, > "3.2"), APFloat(APFloat::IEEEdouble, "5.7"))) > Actual: "" > Expected: "3.200000e+00+5.700000e+00i" > /home/jay/llvm/clang-3.0rc3.src/unittests/AST/APValueTest.cpp:80: Failure > Value of: GetDiagnosticOutput(APValue(V, array_lengthof(V))) > Actual: "" > Expected: "[3, 4, 5]" > [ FAILED ] APValue.Diagnostics (1 ms) > [----------] 1 test from APValue (...