Converting from syms to double

n=n+1; d=double(subs(df(m)));

scatter(m,result)

AE1(n)=double(subs(df(m)))-result;

MAE1(n)=mean(abs(double(df(m))-result));

I can't get my df(m) value to convert to a double

Answer 1

[John D'Errico]

We don't see what is in that variable. But...

If you cannot convert it to a double, then it is not a number. It has some symbolic unknown inside it. LOOK. Is there some variable in that expression? If there is, then nothing can convert it to a double, because it is not yet a number.