[R] superscript characters in title with '+'

[David Winsemius]

On Oct 22, 2010, at 9:15 AM, DrCJones wrote:

>
> Hi,
> Thanks for all of your replies!
>
> David, a slightly modified version of what you gave did the trick:
>
> hist(X,main = expression("["*Ca**""^paste(2,"+")*"]i"~'onsets'))
>
> But I prefer the way '2+' is italicized in the solution Dennis gave:

I agree. Dennis' version was more compact. And it worked if simply  
used as an argument to expression(), and it generalizes to  
substitution. Superior in every way.
>
> hist(X, main = bquote('[Ca'^'2+'*']i'~'onsets'), xlab = 'sec')
>
> I think I understand it now - the '^' symbol must be followed by the  
> '*'
> symbol to signify the end of font italicization;

Er, I don't see any italics in the output or implied by the expression.

> and '~' must be used to
> signify spaces. The only thing I still don't get is why square  
> brackets
> rather than quotation marks surround the 'i' in the solution Claudia  
> gave:
>
> hist(X, main=expression("[" * Ca^"2+" * "]" [i]~'onsets'),  xlab =  
> 'sec')
>

Because the "[]" function in plotmath does subscripting. I guess she  
figured that was what you wanted.

You really need to study ?plotmath some more.

>
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David Winsemius, MD
West Hartford, CT