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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
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Task/Random-numbers/Phix/random-numbers.phix
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@ -1,10 +1,12 @@
-->
<span style="color: #008080;">function</span> <span style="color: #000000;">RandomNormal</span><span style="color: #0000FF;">()</span>
<span style="color: #008080;">return</span> <span style="color: #7060A8;">sqrt</span><span style="color: #0000FF;">(-</span><span style="color: #000000;">2</span><span style="color: #0000FF;">*</span><span style="color: #7060A8;">log</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">rnd</span><span style="color: #0000FF;">()))</span> <span style="color: #0000FF;">*</span> <span style="color: #7060A8;">cos</span><span style="color: #0000FF;">(</span><span style="color: #000000;">2</span><span style="color: #0000FF;">*</span><span style="color: #000000;">PI</span><span style="color: #0000FF;">*</span><span style="color: #7060A8;">rnd</span><span style="color: #0000FF;">())</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
with javascript_semantics
requires("1.0.6") -- std_dev
function random_normal()
return sqrt(-2*log(rnd())) * cos(2*PI*rnd())
end function
<span style="color: #004080;">sequence</span> <span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1000</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
<span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span> <span style="color: #0000FF;">+</span> <span style="color: #000000;">0.5</span> <span style="color: #0000FF;">*</span> <span style="color: #000000;">RandomNormal</span><span style="color: #0000FF;">()</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<!--
sequence s = repeat(0,1000)
for i=1 to length(s) do
s[i] = 1 + 0.5 * random_normal()
end for
printf(1,"mean: %g, std dev: %g\n",{average(s),std_dev(s)})