Hi:

Try
X <- rnorm(100)
hist(X, main = bquote('[Ca'^'2+'*']i'~'onsets'), xlab = 'sec')

or
hist(X, main = bquote('[Ca*]'*i^'2+' ~'onsets'), xlab = 'sec')

I'm not sure which one you want, though.

HTH,
Dennis

On Fri, Oct 22, 2010 at 4:01 AM, DrCJones <matthias.goddard@gmail.com>wrote:

>
> Hi,
>
> How can I get the '2+' into superscript in the following title:
>
> '[Ca2+]i onsets'
>
> I tried the command below, but it doesn't work. What am I missing?
>
> hist(X, main=expression(([Ca*]i^2+) 'onsets'),  xlab = 'sec')
>
>
>
>
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