R plot size and resolution

Question

I have stacked into the question  I need to plot the image with DPI 1200 and specific print size   By default the png looks ok      png  test png  width 3 25 height 3 25 units  in  res 1200  par mar c 5 5 2 2  xaxs    i  yaxs    i  cex axis 1 3 cex lab 1 4  plot perf avg  vertical  spread estimate  stddev  col  black  lty 3  lwd 3  dev off     But when I apply this code  the image became really terrible it s not scaling  fit  to the size that is needed  What did I miss  How to  fit  the image to the plot

User · Answer

If you d like to use base graphics  you may have a look at this  An extract      You can correct this with the res  argument to png  which specifies the number of pixels per inch   The smaller this number  the larger the plot area in inches  and the smaller the text relative to the graph itself

User · Answer

A reproducible example   the plot  lt - function       x  lt - seq 0  1  length out   100    y  lt - pbeta x  1  10    plot      x      y      xlab    False Positive Rate       ylab    Average true positive rate       type    l          James s suggestion of using pointsize  in combination with the various cex parameters  can produce reasonable results   png     test png     width       3 25    height      3 25    units        in     res         1200    pointsize   4   par    mar        c 5  5  2  2     xaxs        i     yaxs        i     cex axis   2    cex lab    2   the plot   dev off       Of course the better solution is to abandon this fiddling with base graphics and use a system that will handle the resolution scaling for you   For example   library ggplot2   ggplot alternative  lt - function       the data  lt - data frame      x  lt - seq 0  1  length out   100       y   pbeta x  1  10       ggplot the data  aes x  y         geom line         xlab  False Positive Rate         ylab  Average true positive rate         coord cartesian 0 1  0 1     ggsave     ggtest png     ggplot alternative      width   3 25    height   3 25    dpi   1200

[r] R plot: size and resolution

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