Many Decimals with vpa()

I understand vpa can give my many decimals of pi, for example. But what if I want to input myself a number with many digits, say 1.282884769975957739739957395739? If I type vpa(1.2828847699759577397399573957,30), I get 1.28288476997595779494076850824, which is not the number I want. I ultimately just want to do calculations on a precise initial number.

Thanks.

Answer 1

[Walter Roberson]

vpa('1.2828847699759577397399573957',30)

Better yet,

x = sym('1.2828847699759577397399573957');
vpa(x, 30)