Why are symbolic expressions being rounded?
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Bill Tubbs
le 2 Sep 2020
Réponse apportée : Bill Tubbs
le 3 Sep 2020
I'm deriving some expressions symbolically and then substituting values and computing the results and I only recently noticed that the results are being rounded.
>> format long
>> syms x; double(subs(10/x,x,3))
ans =
3.333300000000000
or simply,
>> x = sym(3.33333333)
x =
3.3333
>> double(x)
ans =
3.333300000000000
>> syms x
>> p = sym(pi);
>> piVpa = vpa(p)
piVpa =
3.1416
According to the documentation, this is supposed to produce:
piVpa =
3.1415926535897932384626433832795
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Steven Lord
le 2 Sep 2020
Have you changed your digits setting?
help digits
Are you calling the correct double function? What does this show?
which double(x)
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