bash-3.2$ R --vanilla R version 3.4.0 Patched (2017-04-28 r72639) -- "You Stupid Darkness" Copyright (C) 2017 The R Foundation for Statistical Computing Platform: x86_64-apple-darwin15.6.0 (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY. You are welcome to redistribute it under certain conditions. Type 'license()' or 'licence()' for distribution details. Natural language support but running in an English locale R is a collaborative project with many contributors. Type 'contributors()' for more information and 'citation()' on how to cite R or R packages in publications. Type 'demo()' for some demos, 'help()' for on-line help, or 'help.start()' for an HTML browser interface to help. Type 'q()' to quit R. > png("abcd.png", height=.22, width=2) Jun 22 12:13:08 R[59491] <Error>: CGContextTranslateCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. Jun 22 12:13:08 R[59491] <Error>: CGContextScaleCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. > png("abcd.png", height=.22, width=2, units="in", res=300) > dev.cur() quartz_off_screen 3 > dev.off() quartz_off_screen 2 > dev.off() null device 1 > version _ platform x86_64-apple-darwin15.6.0 arch x86_64 os darwin15.6.0 system x86_64, darwin15.6.0 status Patched major 3 minor 4.0 year 2017 month 04 day 28 svn rev 72639 language R version.string R version 3.4.0 Patched (2017-04-28 r72639) nickname You Stupid Darkness > q() bash-3.2$ Deep inside a function with png() inside a loop, after about 70 of the CGContextTranslateCTM messages, I got the crash message Jun 22 11:40:48 R[59174] <Error>: CGBitmapContextCreateImage: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. Process R trace/BPT trap: 5 at Thu Jun 22 11:40:48 2017 For comparison, on Windows R version 3.4.0 Patched (2017-04-28 r72638) -- "You Stupid Darkness" Copyright (C) 2017 The R Foundation for Statistical Computing Platform: x86_64-w64-mingw32/x64 (64-bit) I get an appropriate error message > png("abcd.png", height=.22, width=2) Warning message: In png("abcd.png", height = 0.22, width = 2) : 'width=2, height=0' are unlikely values in pixels > For completeness, the repair, shown above, is to use the units and res arguments. _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac