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我使用R循环遍历数据框的列并生成分析结果图。脚本运行时,我不会收到任何错误,但会生成无法打开的pdf。使用R中的脚本生成pdf时出错使用R中的脚本
如果我运行脚本的内容,它工作正常。我想知道是否有一个问题,它循环的速度有多快,所以我试图强迫它暂停。这似乎没有什么区别。我对任何人的建议都很感兴趣,而且我对R也很陌生,所以我建议如何改进这种方法也值得欢迎。谢谢。
for (i in 2:22) {
# Organise data
pop_den_z = subset(pop_den, pop_den[i] != "0") # Remove zeros
y = pop_den_z[,i] # Get y col
x = pop_den_z[,1] # get x col
y = log(y) # Log transform
# Regression
lm.0 = lm(formula = y ~ x) # make linear model
inter = summary(lm.0)$coefficients[1,1] # Get intercept
slop = summary(lm.0)$coefficients[2,1] # Get slope
# Write to File
a = c(i, inter, slop)
write(a, file = "C:/pop_den_coef.txt", ncolumns = 3, append = TRUE, sep = ",")
## Setup pdf
string = paste("C:/LEED/results/Images/R_graphs/Pop_den", paste(i-2), "City.pdf")
pdf(string, height = 6, width = 9)
p <- qplot(
x, y,
xlab = "Radius [km]",
ylab = "Population Density [log(people/km)]",
xlim = x_range,
main = "Analysis of Cities"
)
# geom_abline(intercept,slope)
p + geom_abline(intercept = inter, slope = slop, colour = "red", size = 1)
Sys.sleep(5)
### close the PDF file
dev.off()
}
这只是格和ggplot2,并没有真正与网格有关。 – hadley 2009-11-25 17:44:38
谢谢哈德利。修复。 – 2009-11-25 19:04:46
谢谢你,工作。我没有意识到它需要明确打印。 – womble 2009-11-25 19:19:29