Hi I am looking at the source code for the follow2 opcode in Csound: https://github.com/csound/csound/blob/2ef3d7cd3f0a910122a61bf45d7fd7b1f22724fa/Opcodes/follow.c, and am finding the following lines used to set the attack parameter somewhat confusing:
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What do EXP and FL mean in this context? I am thinking EXP(x) is e^x, is this correct? What is FL doing (maybe casting as float?)? Lastly, I assume CS_ESR and *csound>onedsr are accessing the sample rate, but what is the purpose of using these two different methods to get it? Thanks! 
I could be wrong but I think you're right  looks like EXP is #defined as exp (which is e^x), and FL is #defined as x##f which essentially concatenates the 'f' token with the number, making it a float rather than implicitly a double (the equivalent of 3.3f for example, rather than 3.3). On Tue, Mar 14, 2017 at 10:36 PM, Emmett Palaima <[hidden email]> wrote:

EXP is a macro that deals with float/double option. FL is similar for constants.
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On 15 Mar 2017, at 05:52, Nikhil Singh <[hidden email]> wrote:
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In reply to this post by epalaima
Onedsr =. 1/sr
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On 15 Mar 2017, at 02:37, Emmett Palaima <[hidden email]> wrote:
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In reply to this post by epalaima
That makes sense. "FL tends to point to Floats in most of what I've seen. This example is single precision? Isn't e^x :: Euler to the "x" power exponent? And x^(n) would be the base of "x" to the power exponent "n"some number? PBS ===============================================  [hidden email] wrote: From: John ff <[hidden email]> To: [hidden email] Subject: Re: [Csnd] What Do FL and EXP Mean in Csound Source Code? Date: Wed, 15 Mar 2017 12:05:03 +0000 EXP is a macro that deals with float/double option. FL is similar for constants.
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On Sat, 18 Mar 2017, Partev Barr Sarkissian wrote: > > > That makes sense. "FL tends to point to Floats in most of what I've seen. > This example is single precision? > > Isn't e^x :: Euler to the "x" power exponent? > And x^(n) would be the base of "x" to the power exponent "n"some number? > > True but not useful. Te exp function (ad expf) re much more efficient. FL(1.0) expands to 1.0 is USE_DOUBLE or 1.0f if not. Removes a number of compiler warnings and potential type conversions Csound mailing list [hidden email] https://listserv.heanet.ie/cgibin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here 
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