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我的代码如下所示.但是我没有得到所有x轴标签,当我尝试用pdf时,它没有以45度显示.由于我是新手,请帮我纠正这个选项.

    pdf(file="figure.pdf", height=3.5, width=5, onefile=TRUE)
    Runtime <- c(579,0,581,610,830,828,592,651,596,596,591,581,587,594,604,606,447,434,445)
    Runtime
    g_range <- range(0,Runtime)
    g_range
    plot(Runtime, type="o", col="blue", ylim=g_range,axes=FALSE, ann=FALSE)
    lab=c('2011-07-20','2011-08-03','2011-08-10','2011-08-17','2011-08-24','2011-08-25','2011-08-27','2011-08-31','2011-09-07','2011-09-10','2011-09-14','2011-09-21','2011-09-28','2011-10-05','2011-10-06','2011-10-07','2011-10-13','2011-10-19','2011-10-31')
    box()
    lab
    axis(1, at=1:19, lab=F)
    text(axTicks(1), par("usr")[3] - 2, srt=45, adj=1, labels=lab, xpd=T, cex=0.8)
    axis(2, las=1, at=500*0:g_range[2])
    title(main="Runtime", col.main="red", font.main=4)
    title(xlab="Build", col.lab=rgb(0,0.5,0))
    title(ylab="MS", col.lab=rgb(0,0.5,0))
    legend(1, g_range[2], c("AveElapsedTime"), cex=0.8, col=c("blue"), pch=21, lty=1);
    dev.off()