Could someone please explain...
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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));
采纳的回答
>> syms x
>> nuy = atan2(f,2*pi*x);
>> rch = 0:0.001:0.3603;
>> subs(nuy,x,rch)
4 个评论
duong mai
2017-3-23
>> f = 0.02;
>> syms x
>> nuy = atan(f./(2*pi*x));
>> rch = 0:0.001:0.3603;
>> subs(nuy,x,rch)
ans =
1.5708 1.2664 1.0098 0.815 0.67216 0.56691 0.48776 etc
Apparently it depends on the version that you are using:
One workaround is shown here:
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