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))
回答（1 个）
xcrit=roots(polyder(q1)); %set derivatives to 0
xcrit(imag(xcrit)~=0)=[]; %get rid of non-real solutions
zmax=max( polyval(q1, [0,xcrit',50]) ); %take max over critical points.
3 个评论
rockstar49
2022-9-20
移动：Matt J
2022-9-20
this almost worked, however recieved this error for the last line
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2022-9-20
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