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Dear r-users, how can I use the "persp" or a similar command in R to plot two surfaces in the same set of axes? many thanks, Dominique

Can someone help interprete the error message below? i was trying to load the package "copula" from the R command prompt. > Error in loadNamespace(package, c(which.lib.loc, lib.loc), keep.source = keep.source) : in 'copula' methods specified for...

Dear r-users, Is there any command in R allowing to evaluate a double integral? for instance let say I want to evaluate the following integral: integrate[lo=(0,1),up=(2,3)] f(x,y)=x^2+y^2...

Dear R helper, does anyone have an idea on why R.2.4.0 draws the surface for the two command lines below and the next time it renders the error message below for exactly the same command lines: > norm...

Dear R-helpers, is it some sort of R internal fault or am I doing something wrong when typing the following two lines in R, I get the surface ploted and trying it another time it gives the error message...

Dear R-helper, Is there any thing that I am doing wrong in the following codes: > norm.cop <- normalCopula(0.5) > persp(norm.cop, dcopula) The last command produces what follows Error in persp(x, y, z, xlim, ylim, zlim...

Dear all, In an attempt to generate a sample of observations from a four dimensional copula from the package Copula, I got the following warning message and all the observations are NA's: Warning messages: 1: In rmvnorm(n, sigma...

Dear helpeRs, I seem to be a little bit confused on the result I am getting from the few codes below: > u=v=seq(0,1,length=30) > u [1] 0.00000000 0.03448276 0.06896552 0.10344828 0.13793103...