r - Arrange multiple (32) .png files in a grid -


i've been pulling hair out past week trying figure out elementary r coding can't seem anywhere (haven't used r since 2013 not great excuse).

all want 4x8 grid made of 32 .png files (maps i've made), , want without loading 1 image file @ time (http://www.statmethods.net/advgraphs/layout.html).

so think can load images within folder writing (please correct me if beliefs bs)

img <- list.files(path='c:/a',patt='compo[0-32].*',full.names=t)

then thinking maybe in lines of par(mfrow=c()), layout, grid.arrange (writing png plots pdf file in r), grid.raster (how join efficiently multiple rgl plots 1 single plot?) - i've read on , experimented accordingly not resulting in worthwhile..

the latter employed following outcome enter image description here

it made me giggle. don't think lattice way go anyway.

any appreciated!

not sure concern loading image files -- how else read data create new image?

eta: load files, i'd use png::readpng . 1 way collect images be(12 images selected here)

filenames<-dir(pattern='compo') foo<-list() for(j in 1:12) foo[[j]]<-readpng(filenames[j]

if you're willing load them , use base plot tools, layout command want. e.g., 12 images loaded

layout(matrix(1:12,nr=4,byr=t)) (j in 1:12) plot(foo[[j]])

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