R expression使用

text(20,150,adj=0,"Tumour: N = 252; ",col=c("#E51718"),cex=1)    
text(40,150,adj=0,as.expression(substitute(rho == tumor_cor,list(tumor_cor=as.character(format(round(t.cor$estimate,2)))))),col=c("#E51718"),cex=1)
text(50,150,adj=0,as.expression(substitute(italic(P) == tumor_pvalue,list(tumor_pvalue=as.character(format(t.cor$p.value))))),col=c("#E51718"),cex=1)


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