Dear R-ers,
   
  I conducted a regression analysis, and then intended to add the regression function (y=4.33+1.07x) in a graph. But the following code can only give me a text like y=a+bx. Who can help me out? Thank you very much in advance.
   
   
  CODE
   
  # Read data
  x <- c(1, 2, 3, 4, 5, 6, 7, 8, 9)
  y <- c(6, 5, 8, 9, 11, 10, 11, 12, 15)
  data01 <- data.frame(x, y)
   
  # Regression analysis
  res.lm.y <- nls(y~a+b*x, start=list(a=1, b=2),data=data01)
   
  # Obtain parameters
  a<- coef(res.lm.y)["a"]
  b<- coef(res.lm.y)["b"]
  a
  b
  #a=4.33
  #b=1.07
   
  # Plot the results
  def.par <- par()
  par(mfrow=c(1,1),xaxs="i",yaxs="i")
  plot(data01$x,data01$y,main="Fit",xlab="x",ylab="y")
  lines(data01$x,predict(res.lm.y))
   
  #=======
  text (6, 13, expression(y==a+b*x))
  #=======
   
  ## I intended to add text like y=4.33+1.07x 
  ## but the above code added y=a+bx
   


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