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Editorial Team
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Asked: 2026-06-15T01:58:57+00:00

I tried almost all combinations of paste(), bquote(), as.expression(), c(),… plot(d[,y], type=l,xlim=c(1,n), ylim=c(min(d[,y]),max(d[,y])), ylab=Y,

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I tried almost all combinations of paste(), bquote(), as.expression(), c(),…

plot(d[,"y"], type="l",xlim=c(1,n), ylim=c(min(d[,"y"]),max(d[,"y"])), 
  ylab="Y", xlab="T", main="ARMA(1,1)",
   sub=c(as.expression(bquote(phi == .(coef_ar)), 
         as.expression(bquote(theta == .(coef_ma))))))

This just plots “phi = 0.5” (the greek symbol in this case) but not the second part (the theta).
Can anyone help me please!

Thanks!

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1 Answer

  1. Editorial Team

    You can use substitute. ~ will concatenate together the expressions with a space

    plot(1, main = substitute(phi == Phi ~ theta == Theta, list(Phi = 1, Theta = 1)))

    enter image description here

    or you can use bquote in a similar manner

    plot(1, main = bquote(phi == .(coef_ar)  ~ theta == .(coef_ma)))

    The reason your initial approach did not work is because it creates a vector of expressions, and then used only the first element for the subtitle.

    If you want comma separated values, then use list(),

    eg

     plot(1, main = bquote(list(phi == .(coef_ar), theta == .(coef_ma))))
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