How to obtain a absolute of a number in Xilinx Simulink?

I need to get the absolute of the signal in Xilinx Simulink.

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I can use a mcode block and write matlab code to achieve it. But, just curious if there is a better way of doing it.

I am very new to using Simulink(Xilinx). Is there any abs block as in Simulink in Xilinx library.

Thanks

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Xilinx have the following Answer Record:

http://www.xilinx.com/support/answers/10975.htm

which pretty much covers what you've already done!