On 2020-08-18 11:02 +1200, Paul Murrell wrote: | On 18/08/20 9:54 am, Bert Gunter wrote: | | On Mon, Aug 17, 2020 at 2:14 PM <cpolw...@chemo.org.uk> wrote: | | | | | | Plotmath seems to be the right way | | | to do it. But without reading | | | plotmath I'd have gone with this: | | | | | | plot(y, main=paste("data", "\u03C3=", s)) | | | | "Plotmath seems to be the right way | | to do it." | | | | Not sure I agree with that. Paul | | Murrell put together plotmath around | | 2000 prior to the widescale | | development and adoption of the | | unicode standard | | (corrections/modifications | | welcome!). So at the time, there | | really was no other way to handle | | this for most OS'es. With UTF8 now | | being generally supported for | | Unicode, plotmath constructions may | | not be needed for simple symbol | | labeling, as here. Of course for | | more complex symbolism (fractions, | | integrals, ...) it will be. | | ?plotmath talks about this and has | | links to further issues and options, | | btw. | | | | In other words, unicode may indeed | | be better than my suggestion of | | plotmath here. | | I think that comment is fair *on | graphics devices that can handle | unicode*. | | So that is true for Cairo-based | graphics devices, but not for the | pdf() or postscript() devices, for | example.
Eventhough I'm a heavy user of pdf(), I didn't notice at first that the sigma gets converted to two dots with the error messages Warning messages: 1: In title(...) : conversion failure on 'data σ= 1' in 'mbcsToSbcs': dot substituted for <cf> 2: In title(...) : conversion failure on 'data σ= 1' in 'mbcsToSbcs': dot substituted for <83> 3: In title(...) : conversion failure on 'data σ= 1' in 'mbcsToSbcs': dot substituted for <cf> 4: In title(...) : conversion failure on 'data σ= 1' in 'mbcsToSbcs': dot substituted for <83> like if it was a Han character (most likely three dots in that case), I just ran with cpolwart's suggestion in whatever is the default on the R console, probably that Cairo thing. png() works ofc. V r
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