why dosen't out put as short answer?
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sadiqah aldahan
le 15 Avr 2022
Commenté : Walter Roberson
le 16 Avr 2022
syms y
R1=(nthroot(y-2,3)+2);
R2=y;
R3=1;
eq1=int(R1^2,y,1,2.1);
eq2=int(R2^2,y,2.094,4);
eq3=int(R3^2,y,0,1);
format short
volume=(eq1+eq2+eq3)*pi
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Star Strider
le 16 Avr 2022
Because it is symbolic, not numeric.
syms y
R1=(nthroot(y-2,3)+2);
R2=y;
R3=1;
eq1=int(R1^2,y,1,2.1);
eq2=int(R2^2,y,2.094,4);
eq3=int(R3^2,y,0,1);
format short
volume=(eq1+eq2+eq3)*pi
vpa_volume = vpa(volume)
double_volume = double(volume)
If you want to always have this sort of result, see the documentation on sympref, and specifically Display Symbolic Results in Floating-Point Format.
.
1 commentaire
Walter Roberson
le 16 Avr 2022
The purpose of solve() and int() are to return indefinitely precise answers whenever possible. solve() avoids approximate numeric solutions, and int() never uses approximate numeric solutions. If you int() and the exact theoretical solution is
then int() will return that, not 1.236<something>
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/965885/image.png)
If what you want is a numeric approximation then you should be reconsidering whether you should be using int() at all: perhaps you should be using the pure-numeric integral() or perhaps you should be doing extended precision numeric approximation using vpaintegral()
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