[R] birats example with R2WinBugs

[M JH]

Hello,

I am trying, and failing, to do the birats example from the WinBugs manual
with R2Winbugs.

I can manage the rats example OK. Also, I can manage birats in WinBugs.

Here is the code I am running, the .bug program, and the error message. Any
help would be gratefully received.

Thank you,
Mike

                        
library(R2WinBUGS)    

data = list(x = c(8.0, 15.0, 22.0, 29.0, 36.0), N = 30, T = 5,
		Omega = structure(.Data = c(200, 0, 0, 0.2), .Dim = c(2, 2)),	
		mean = c(0,0),
		prec = structure(.Data = c(1.0E-6, 0, 0, 1.0E-6), .Dim = c(2, 2)),
		Y = structure(
			.Data =   c(151, 199, 246, 283, 320,
							 145, 199, 249, 293, 354,
							 147, 214, 263, 312, 328,
							 155, 200, 237, 272, 297,
							 135, 188, 230, 280, 323,
							 159, 210, 252, 298, 331,
							 141, 189, 231, 275, 305,
							 159, 201, 248, 297, 338,
							 177, 236, 285, 350, 376,
							 134, 182, 220, 260, 296,
							 160, 208, 261, 313, 352,
							 143, 188, 220, 273, 314,
							 154, 200, 244, 289, 325,
							 171, 221, 270, 326, 358,
							 163, 216, 242, 281, 312,
							 160, 207, 248, 288, 324,
							 142, 187, 234, 280, 316,
							 156, 203, 243, 283, 317,
							 157, 212, 259, 307, 336,
							 152, 203, 246, 286, 321,
							 154, 205, 253, 298, 334,
							 139, 190, 225, 267, 302,
							 146, 191, 229, 272, 302,
							 157, 211, 250, 285, 323,
							 132, 185, 237, 286, 331,
							 160, 207, 257, 303, 345,
							 169, 216, 261, 295, 333,
							 157, 205, 248, 289, 316,
							 137, 180, 219, 258, 291,
							 153, 200, 244, 286, 324),
						.Dim = c(30,5)))                          
    
inits <- list(mu.beta = c(0,0), tauC = 1,
		      beta = structure(
				.Data = c(100,6,100,6,100,6,100,6,100,6,
		               100,6,100,6,100,6,100,6,100,6,
		               100,6,100,6,100,6,100,6,100,6,
		               100,6,100,6,100,6,100,6,100,6,
		               100,6,100,6,100,6,100,6,100,6,
		               100,6,100,6,100,6,100,6,100,6),
				.Dim = c(30, 2)),
		      R = structure(.Data = c(1,0,0,1), .Dim = c(2, 2)))  		      
		      
		      names(inits)
		      inits$R
		      is.matrix(inits$beta)
		      is.matrix(inits$R)
          
mhbirats = bugs(data, inits, model.file = "birats.bug",   

              parameters.to.save = c("beta", "R", "tauC",  "mu.beta"),       

       n.chains = 1, n.iter=10000, n.burnin=1000, n.thin=1,

       bugs.directory = "c:/Program Files/WinBUGS14/",  debug = TRUE)

### birats example from winbugs

	model
	{
		for( i in 1 : N ) {
			beta[i , 1:2] ~ dmnorm(mu.beta[], R[ , ])		
			for( j in 1 : T ) {
				Y[i , j] ~ dnorm(mu[i , j], tauC)			
				mu[i , j] <- beta[i , 1] + beta[i , 2] * x[j]
			}
		}
		
		mu.beta[1:2] ~ dmnorm(mean[],prec[ , ])
		R[1:2 , 1:2] ~ dwish(Omega[ , ], 2)				
		tauC ~ dgamma(0.001, 0.001)
		sigma <- 1 / sqrt(tauC)	
}

### the error message


Error in bugs(data, inits, model.file = "birats.bug", parameters.to.save =
c("beta",  : 
  Number of initialized chains (length(inits)) != n.chains

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