# [R] Positioning main title

Greg Snow 538280 at gmail.com
Thu Apr 26 19:18:57 CEST 2012

```You could also use the grconvertX function to convert from the middle
of the plotting region (from='npc') to user coordinates (to='user'),
or many other combinations.

On Wed, Apr 25, 2012 at 5:53 AM, Ramon Ovelar <ramon.ovelar at gmail.com> wrote:
> Many many thanks for the tip and for authoring this function!
>
> The final code for the plot goes like this:
>
> par(mar=c(0, 17, 3, 0), oma=c(0, 0, 0, 0))
> barplot2(prueba,  col=colores, horiz=TRUE,las=1, cex.names=.7)
> mtext(l,side = 3, at = getFigCtr()[1], line = 0.8, cex=1.5)
>
>
>
> On Wed, Apr 25, 2012 at 12:51 PM, Jim Lemon <jim at bitwrit.com.au> wrote:
>
>> On 04/25/2012 12:28 AM, ramonovelar wrote:
>>
>>> Hello,
>>>
>>> I have a barplot where each row has quite long texts and I have used "par"
>>> to make some room in the left:
>>> par(mar=c(0, 17, 3, 0), oma=c(0, 0, 0, 0))
>>> barplot2(prueba, main = l, col=colores, horiz=TRUE,las=1, cex.names=.7)
>>>
>>> My problem is that main text appears justified to the plot. I want to put
>>> it
>>> in the middle of the image, and find a way to sort it  out with mtex
>>>
>>> par(mar=c(0, 17, 3, 0), oma=c(0, 0, 0, 0))
>>> barplot2(prueba,  col=colores, horiz=TRUE,las=1, cex.names=.7)
>>> mtext(l,side = 3, at = -70, line = 0.8)
>>>
>>> But I will have to adjust this "at =-70" to his plot, depending on the
>>> length of the title. I wonder if I can't find a way to place it in the
>>> center.
>>>
>>>  Hi Ramon,
>> Have a look at the getFigCtr function in the plotrix package. This returns
>> the center of the figure region by default, but can be adjusted to return
>> different proportions of the figure region.
>>
>> Jim
>>
>>
>
>
> --
> ==================================
> Ramón Ovelar
>
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>
>
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