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i have used hdl coder in matlab 2015 but the following errors appears in image

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hos.9876

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errors.png
please help me to solve this problems. is the problem in exp built-in function in matlab ???
 
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Seems so. I guess you are trying to apply the exp() function to fixed point numbers which is apparently not supported.

I fear you need to get rid of the idea that arbitrary arithmetic can be put into FPGA without thinking a bit about number formats and how particular functions can be synthesized in hardware. I would expect that the hdl coder documentation gives some help in this regard.
 

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