低級繪圖--網格線

grid(nx = NULL, ny = nx, col = "lightgray", lty = "dotted", lwd = par("lwd"), equilogs = TRUE) nx：垂直網格的數據 ny：水平網格的數據 barplot(VADeaths,besides=TRUE,col = cm.colors(5)) grid() barplot(VADeaths,besi

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