MATLAB: Could someone please explain…

explain

I have some expressions, I dont know the different between using function 'subs' and calculating directly. My purpose is calculate nuy, by substitute the varience 'rch' into 'atan(f./(2*pi*x))' .
When I use 'subs' function, it results the error, division by zero.
But when I calculate directly, there are not error, and I obtained the result? Could anyone explain me about this?
>> syms x
>> nuy = atan(f./(2*pi*x));
>> rch = 0:0.001:0.3603;
>> subs(nuy,x,rch);
Error using symengine Division by zero.
Error in sym/subs>mupadsubs (line 140) G = mupadmex('symobj::fullsubs',F.s,X2,Y2);
Error in sym/subs (line 125) G = mupadsubs(F,X,Y);
nuy = atan(f./(2*pi*rch));

Best Answer

If you are using R2013A or newer then use atan2 instead:
>> syms x
>> nuy = atan2(f,2*pi*x);
>> rch = 0:0.001:0.3603;
>> subs(nuy,x,rch)
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