What is the Fixed-Point function replacement for atan?

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priya agarwal 2014-1-15

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回答： Paul Bayendang 2014-4-11

I am converting my matlab function to vhdl. What is the function replacement for atan so that it can be converted to fixed point? And also another error is reported. error : Undefined function or variable 'epsilon_out'. The first assignent to a local variable determines its class. how to remove this.

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Answer 1

Tim McBrayer 2014-1-15

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The list of functions supported for HDL code generation is in the HDL Coder documentation. As you have discovered, atan and atan2 are not supported. If you know your input range you can build a lookup table to approximate a function to a suitable precision.

The error message mentioning epsilonout is simply due to the presence of the earlier errors. Once you have valid implementations/replacements for atan and atan2, you won't encounter any issue with epsilonout.