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This article shows you how to calculate arbitrary digit pi in MicroPython. The content is concise and easy to understand. It will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Calculating pi with arbitrary precision is an interesting topic, and thanks to the powerful computing power of python, we can easily calculate the value of pi in MicroPython.

Enter the following code first:

"" File: pi.py description: using MicroPython to calculate arbitrary precision pi calculation author: unknown version: time: modification: Shao Ziyang 2016.5 v1.1 http://bbs.micro-python.com/forum.php"""import timedef pi (places=10): # 3 + 3 * (1max 24) + 3 * (1max 24) * (9max 80) + 3 * (1max 24) * (9max 80) * (25168) # The numerators 1,9,25 ... Are given by (2x + 1) ^ 2 # The denominators 24,80,168 are given by (16x ^ 2-24x + 8) extra = 8 one = 10 * * (places+extra) t, c, n, na, d, da = 3*one, 3*one, 1,0,0,24 while t > 1: n, na, d, da = n+na, na+8, d+da Da+32 t = t * n / / d c + = t return c / / (10 * * extra) def pi_t (nasty 10): t1=time.ticks_us () t=pi (n) t2=time.ticks_us () print ('elapsed:', time.ticks_diff (T1 focus T2) / 1000000 's') return tdef pi2 (n = 10): rang 6 * (10 times / n) * 1000 p / s 0 kang 0 c=r//2 d=c// (2*k+1) while d > 0: p=p+d k=k+1 K2 / 2 / 2 / (4*k2) d=c// (k2 / 1) return p//1000def pi2_t (n = 10): t1=time.ticks_us () t=pi2 (n) T2=time.ticks_us () print ('elapsed:' Time.ticks_diff (T1 and T2) / 1000000,'s') return t

Let's copy it to STM32F7DISC (STM32F7DISC has downloaded the MicroPython firmware) and test the computing speed. (this test can also be done on other MicroPython development boards)

MicroPython v1.8 on 2016-05-15; F7DISC with STM32F746

Type "help ()" for more information.

> import pi

Npi=pi.pi_t (1000)

Elapsed: 0.221486 s

Npi=pi.pi_t (2000)

Elapsed: 0.793141 s

Npi=pi.pi_t (5000)

Elapsed: 4.981964 s

Npi=pi.pi_t (10000)

Elapsed: 21.02012 s

> > >

As can be seen from the running results, although not very fast, but considering the resources and performance of STM32, the results have been unexpected, after all, the calculation function is less than 10 lines of code, there is no in-depth optimization. Finally, a 1000-bit pi is printed, which can be compared with the standard results.

Pi.pi (1000)

31415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989

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The above is how to calculate arbitrary digit pi in MicroPython. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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