I am trying to solve the integration equation, for different values of K from 4 to 25, the integration is with respect to u,
Here is the equation: gamma(k/2) / ( sqrt(k-1)*gamma((k-1)/2) ) * integrate(f= (1+u^2/k-1)^(-k/2), lower=0, upper= sqrt(a^2*k/(k+1-a^2)) ) = the similar expression as te left hand except k becomes k+1 my code is below, I don't know why R keep telling me the syntax wrong but I am not clear, thanks. f<-function(u,k){(1+u^2/(k-1))^(-k/2)} g<-function(u,k){(1+u^2/k)^(-(k+1)/2)} for(k in 4:25){ out<-uniroot(function(a){ m<-exp(lgamma(k/2)-lgamma((k-1)/2))*1/sqrt(k-1) n<-exp(lgamma((k+1)/2)-lgamma(k/2)*1/sqrt(k) m*integrate(f,lower=0,upper=sqrt(a^2*(k-1)/(k-a^2)),rel.tol=.Machine$double.eps^0.25) -n*integrate(g,lower=0,upper=sqrt(a^2*k/(k+1-a^2)),rel.tol=.Machine$double.eps^0.25) } lower=1.4, upper=2) print(unlist(out))} -- View this message in context: http://www.nabble.com/help-me-to-debug-this-part-of-code--tp16763482p16763482.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.