How can I change precision in Matlab?

I am comparing some values between Fortran 90 and Matlab. The calculated value of A in Fortran has 20 digits, thus when calculating B it also has 20 digits. The same calculations are made in Matlab but the calculated value of A has 15 digits, thus the calculation of B will be different from the B calculated in Fortran.

How can I make Matlab calculating everything with a precision of 20 digits such as Fortran does?

Answer 1

[KL]

try vpa

vpa(B,20)

[Kyriacos Patsalides]

I tried that one but then Matlab gives my an error. I know that Matlab can provide up to 16 digits but I don't know if i must have like a specific version of Matlab that will allow me to use vpa

[Stephen23]

@Kyriacos Patsalides: vpa does not require a special version of MATLAB, but it is a part of the symbolic toolbox. If you do not have that toolbox installed and have a license for it then you will not be able to use it.