2. Systematic code examples: a guided tour of Numscrypt¶
One ready-to-run code example is worth more than ten lengthy descriptions. The autotest and demo suite, that is part of the distribution, is a collection of sourcecode fragments called testlets. These testlets are used for automated regression testing of Numscrypt against CPython. Since they systematically cover all the library constructs, they are also very effective as a learning tool. The testlets are arranged alphabetically by subject.
Autotest: Numcrypt autotest demo suite¶
import org.transcrypt.autotester
import basics
autoTester = org.transcrypt.autotester.AutoTester ()
autoTester.run (basics, 'basics')
autoTester.done ()
2.1. Basics: creating and using arrays¶
Testlet: basics¶
from org.transcrypt.stubs.browser import *
from org.transcrypt.stubs.browser import __main__, __envir__, __pragma__
if __envir__.executor_name == __envir__.transpiler_name:
import numscrypt as num
__pragma__ ('skip')
import numpy as num # Bundling: import has to be known compile time
__pragma__ ('noskip')
def run (autoTester):
z = num.zeros ((4, 3, 2), 'int32')
autoTester.check ('Zeros', z.tolist (), '<br>')
o = num.ones ((1, 2, 3))
autoTester.check ('Ones', o.astype ('int32') .tolist ())
i = num.identity (3, 'int32')
autoTester.check ('Identity', i.tolist (), '<br>')
# shape: 2 blocks x 3 rows x 4 columns
a = num.array ([
[
[1, 1, 2, 3],
[4, 5, 6, 7],
[8, 9, 10, 12]
], [
[100, 101, 102, 103],
[104, 105, 106, 107],
[108, 109, 110, 112]
]
])
autoTester.check ('Matrix a', a.tolist (), '<br>')
b = num.array ([
[
[2, 2, 4, 6],
[8, 10, 12, 14],
[16, 18, 20, 24]
], [
[200, 202, 204, 206],
[208, 210, 212, 214],
[216, 218, 220, 224]
]
])
autoTester.check ('Matrix b', b.tolist (), '<br>')
c = num.array ([
[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12],
])
d = num.array ([
[13, 14],
[15, 16],
[17, 18],
[19, 20]
])
__pragma__ ('opov')
sum = a + b
dif = a - b
prod = a * b
quot = a / b
dot = c @ d
__pragma__ ('noopov')
autoTester.check ('Matrix sum', sum.tolist (), '<br>')
autoTester.check ('Matrix difference', dif.tolist (), '<br>')
autoTester.check ('Matrix product', prod.tolist (), '<br>')
autoTester.check ('Matrix quotient', quot.tolist (), '<br>')
autoTester.check ('Matrix dotproduct', dot.tolist (), '<br>')