value of ฯ by Gregory-Leibniz series in fortran
An infinite sum series first given by Madhava and later rediscovered by Gregory and Leibniz is expressed as,
โโn=0(-1)n2n+1=ฯ4or, ฯ4=โโn=0(-1)n2n+1
โดฯ=4รโโn=0(-1)n2n+1
Where n = 0,1,2,3,4,5, .................................., positive integer.
For n =0
ฯ=4ร1
For n = 0,1
ฯ=4ร(1-13)
For n = 0,1,2
ฯ=4ร(1-13+15)
For n = 0,1,2,3
ฯ=4ร(1-13+15-17) and so on.
Continuiing this process up to nโโ, you obviously get,
ฯ=4ร(1-13+15-17+19-111+....................) (2)
This is called Gregory-Leibniz series to estimate value of ฯ.
fig. 1. n vs. ฯ plot
n gives number of terms in the series.
To get fortran code for estimation of value of ฯ by using Gregory-Liebniz series, click on the given button : Get Files
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