[R] Problem displaying greek symbols

[Jorge Fernández García]

Hi,


I have a problem displaying greek (and in general any special character).


I know I am using the right command as the same script works in Fedora20 but not in MAC Yosemite.


ylab=expression(delta) displays a square instead of the right symbol when I view the resulting pdf file with preview or any other tool to display pdf.


Any idea of what's going on?


Thanks in advance



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