how to link the c code functions during code generation

hi every one , my project is finding the peaks of the audio signals in frequency domain at certain threshold I have used CWTFT then i got the result and i can find out the peaks of my audio signals ,

now i got stuck at code conversion for supporting hardware package arduino uno, The few code lines from my programm

for example

s=[50:0.05:68];    scales  selection  

f0=scal2frq(s,'morl',dt);  % function convert the corresponding scales to freq's 

scales = helperCWTTimeFreqVector(15000,22050,f0,dt,32);

when I am trying to convert matlab code to c code error shows floor & ceil not supported for code gen floor & ceil are from below mat fun at minscale maxscale

function scales = helperCWTTimeFreqVector(minfreq,maxfreq,f0,dt,NumVoices)

a0 = 2^(1/NumVoices);

minscale = f0/(maxfreq*dt);

maxscale = f0/(minfreq*dt);

minscale = floor(NumVoices*log2(minscale));

maxscale = ceil(NumVoices*log2(maxscale));

scales = a0.^(minscale:maxscale).*dt;

as i know floor and ceil are used to rounds the nearest values, when i searched i got implemented c files for floor and ceil , how would i link these c files during code generation