I need approssimation of pi with x digits

Hi, i would need to choose number of significative digits with which display, for example, pi or another value. Is there a way to set this?

[Daniel Shub]

What have you tried so far?

Answer 1

[Robert Cumming]

help format
help fprintf

[Walter Roberson]

And if more than 15 digits are required, then switch to the Fixed Point toolkit or the Symbolic Toolkit.

Answer 2

[Matman86 Di]

Ok, question is more complicated...give the series sum_i^n 4*h/(1+(i*h)^2 I have to find N value that gives me pi with x significative digits...possible?

[Walter Roberson]

Not possible. If I set h to be 0 or negative, the result of the summation can never be positive.

Answer 3

[Matman86 Di]

Sorry, h is 1/N that's the series approximation of pi I forgot to tell.

[Walter Roberson]

All that tells is us that h is (in the absence of further assumptions) not 1/0 . N is not bound by the problem, so we are free to set it to any number we choose, including N = -1/50 (leading to h = -50) or to N = infinity (leading to h = 0).

Keep in mind, when considering this, that the problem statement has left us open to using any arbitrary lower bound on the summation, since no lower bound was given. And effectively any arbitrary upper bound too, since the upper summation bound, n, does not otherwise appear in the problem statement.