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有没有办法只使用这段代码使 pch 符号更大?我似乎无法弄清楚这一点。
plot(1) legend("topright", legend=c(1,2,3,4,5,6), pch=c(20), col=c("red", "yellow", "green", "violet", "skyblue", "cyan"), title="number of studies", pt.cex=1.2)
您可以设置pt.cex内部图例以放大点。
pt.cex