3d graph to show matrix of z matrix values

Hello,

I'm not getting a great looking 3d graph when plotting my z values:

     x<- seq(0.0, max(d1), max(d1)/20)
     y<- seq(0.0, max(d2), max(d2)/20)
     z<- matrix(NA, length(x), length(y))

persp3d(x, y, z, phi=30, theta=30, scale=TRUE,shade = 0.75,
col=pal[col.ind], xlab=var.name[1], ylab=var.name[2], main="3d plot")

Your z values are all NA.  What are you expecting to see?

*z values*: 
i <- 0
    for (el.x in x)
    { 
      i <- i+1
	    j <- 1	
	    for (el.y in y)
		  {  
        if( el.x==0 & el.y==0) *z[i,j]* <- Emax + B
        if(!(el.x==0 & el.y==0)) *z[i,j]* <- model(el.x, el.y, m1, m2, dm1,
dm2, alpha)
        j <- j+1
      }
    }




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