Stretched plots in R when plotting multiple figures to PDF -

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i'm trying create pdf multiple plots in pdf, when create pdf 2 x 2 plots plots square , looks nice:

pdf(file=paste0("test.pdf"), paper = "a4") par(mfrow=(c(2,2)), omi=c(0,0,0,0), mar=c(2, 2, 0, 0)) (i in 1:4) {     plot(1:10) } dev.off()

however if try generate pdf 3 rows , 2 columns plots not square. plots seems stretched entire 3 x 2 matrix of plots squared:

pdf(file=paste0("test 2.pdf"), paper = "a4") par(mfrow=(c(3,2)), omi=c(0,0,0,0), mar=c(2, 2, 0, 0)) (i in 1:6) {     plot(1:10) } dev.off()

how individual plots square in configuration number of rows , columns not equal?

thanks in advance.

apparantly can use layout instead

pdf(file=paste0("test 2.pdf"), paper = "a4") layout(matrix(1:6, 3, 2, byrow = true), respect = true) par(omi=c(0,0,0,0), mar=c(2, 2, 0, 0)) (i in 1:6) {     plot(1:10) } dev.off()

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