Use a variable within a plotmath expression

Question

I\'m trying to place the results of a regression (i.e., R2) in a graph, but can\'t seem to figure out how to call a variable from within an expression (it pastes the variabl

Answer 1

To combine substitute() and paste(), I use the following code;

waic <-1;
chisquare <-2;
plot(x=1:2,y=1:2, 
     main =  substitute(paste(
    "chi^2 goodness of fit ", 
       chi^2*(D/theta) , "=",  chisquare ,
       ".  WAIC =",waic),


list(chisquare=chisquare,waic=waic)  
)
)

The result is the following;