Merge branch 'master' of fab2neilg:pub/pi

Python/micropi.py

+#
+# micropi.py
+# Neil Gershenfeld 12/26/22
+# calculation of pi by a MicroPython sum
+# pi = 3.14159265358979323846 
+#
+
+import time,machine
+
+NPTS = 1000000
+
+@micropython.native
+def calc():
+   a = 0.5
+   b = 0.75
+   c = 0.25
+   pi = 0
+   for i in range(1,(NPTS+1)):
+      pi += a/((i-b)*(i-c))
+   return pi
+
+machine.freq(250000000)
+start_time = time.time()
+pi = calc()
+end_time = time.time()
+mflops = NPTS*5.0/(1.0e6*(end_time-start_time))
+print("NPTS = %d, pi = %f"%(NPTS,pi))
+print("time = %f, estimated MFlops = %f"%(end_time-start_time,mflops))

README.md

@@ -54,7 +54,7 @@
 |0.001|prior|Sun SPARCStation 1|C|prior|
 |0.001|prior|DEC VAX 8650|C|prior|
 |0.0007|prior|Intel 486|C|prior|
-|0.00021|[pi.py](Python/pi.py)|MicroPython, 250 MHz|RP2040|December, 2022|
+|0.00031|[micropi.py](Python/micropi.py)|MicroPython, 250 MHz|RP2040|December, 2022|
 |0.0002|[pi.ino](Arduino/pi.ino)|Arduino, floats|ATSAMD21E|December, 2020|
 |0.0001|[pi.ino](Arduino/pi.ino)|Arduino, floats|ATtiny1614|December, 2020|
 |0.00003|prior|Sun 3/60|C|prior|