Find max value in polyfit
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Like to find the max value of this polyfit
tmp1=abs(FRF);
q1 = polyfit(f(f>0 & f <50),tmp1(f>0 & f <50),4);
z1 = polyval(q1,f);
plot(f(f>0 & f <50),z1(f>0 & f <50))
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