search for: jaggedness

I am having trouble getting smooth-appearing curves in figures produced as windows metafiles using R (R-1.1.1 on Windows 98). When I import them into a word processor (either MS Word 97, or WordPerfect 9.0), the figures appear only slightly bumpy on screen, but when printed, there is a clear jaggedness reminiscent of aliasing. Is there a fix for this (if the answer is "upgrade to 1.2", I'll be doing that as soon as binaries for Windows are available, anyway)? Maybe metafiles have a coarse underlying resolution? The following code produces the problem (along with a postscript plot...

...e others I'm not sure. 3) Is there a quick way to check whether the gradient is discontinous at a point, numerically (rather than calculating the analytical derivatives)? I did plot(diff(y)) and it certainly looks messy, but I also have other y vectors which look equally jagged (though the jaggedness occurs at lower x) Any suggestions would be appreciated. Thanks, ------------------------------------------------------------------- Rajarshi Guha <rxg218 at psu.edu> <http://jijo.cjb.net> GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE ----------------------------...

...9;l', lty=3, xlim=c(1.01,-0.01), ylim=c(-0.01,1.01), xaxs='i', yaxs='i', ylab='', xlab='') > plot(smooth(roc_1),col="brown3", lwd=2, add=T, lty=1) > > > I guess most ROCs that I've seen are somewhere in between, i.e. they have a little jaggedness, but not as much as in plot #1 above.<test_roc.png><test_roc_smooth.png> > > thanks! > > Pankaj > > On Mon, Jun 26, 2017 at 12:59 PM, Marc Schwartz <marc_schwartz at me.com <mailto:marc_schwartz at me.com>> wrote: > > > On Jun 26, 2017, at 11:4...

> On Jun 26, 2017, at 11:40 AM, Brian Smith <bsmith030465 at gmail.com> wrote: > > Hi, > > I was trying to draw some ROC curves (prediction of case/control status), > but seem to be getting a somewhat jagged plot. Can I do something that > would 'smooth' it somewhat? Most roc curves seem to have many incremental > changes (in x and y directions), but my plot

Hi, I was trying to draw some ROC curves (prediction of case/control status), but seem to be getting a somewhat jagged plot. Can I do something that would 'smooth' it somewhat? Most roc curves seem to have many incremental changes (in x and y directions), but my plot only has 4 or 5 steps even though there are 22 data points. Should I be doing something differently? How can I provide a