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Symmetric difference: Difference between revisions

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Symmetric difference (view source)

Revision as of 14:43, 11 May 2021

9,550 bytes added ,  3 years ago
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→‎{{header|Phix}}: added example using the new buitin
(Add Datalog task)
m (→‎{{header|Phix}}: added example using the new buitin)
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=={{header|Phix}}==
<!--<lang Phix>function Union(sequence a, sequence bphixonline)-->
<span style="color: #008080;">function</span> <span style="color: #000000;">Union</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">a</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">sequence</span> <span style="color: #000000;">b</span><span style="color: #0000FF;">)</span>
for i=1 to length(a) do
<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;">a</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
if not find(a[i],b) then
<span style="color: #008080;">if</span> <span style="color: #008080;">not</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">],</span><span style="color: #000000;">b</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
b = append(b,a[i])
<span style="color: #000000;">b</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">b</span><span style="color: #0000FF;">,</span><span style="color: #000000;">a</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">])</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
return b
<span style="color: #008080;">return</span> <span style="color: #000000;">b</span>
end function
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
 
function Difference(sequence a, sequence b)
<span style="color: #008080;">function</span> <span style="color: #000000;">Difference</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">a</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">sequence</span> <span style="color: #000000;">b</span><span style="color: #0000FF;">)</span>
sequence res = {}
<span style="color: #004080;">sequence</span> <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span>
for i=1 to length(a) do
<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;">a</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
if not find(a[i],b)
<span style="color: #008080;">if</span> <span style="color: #008080;">not</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">],</span><span style="color: #000000;">b</span><span style="color: #0000FF;">)</span>
and not find(a[i],res) then
<span style="color: #008080;">and</span> <span style="color: #008080;">not</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">],</span><span style="color: #000000;">res</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
res = append(res,a[i])
<span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">res</span><span style="color: #0000FF;">,</span><span style="color: #000000;">a</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">])</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
return res
<span style="color: #008080;">return</span> <span style="color: #000000;">res</span>
end function
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
 
function Symmetric_Difference(sequence a, sequence b)
<span style="color: #008080;">function</span> <span style="color: #000000;">Symmetric_Difference</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">a</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">sequence</span> <span style="color: #000000;">b</span><span style="color: #0000FF;">)</span>
return Union(Difference(a, b), Difference(b, a))
<span style="color: #008080;">return</span> <span style="color: #000000;">Union</span><span style="color: #0000FF;">(</span><span style="color: #000000;">Difference</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">b</span><span style="color: #0000FF;">),</span> <span style="color: #000000;">Difference</span><span style="color: #0000FF;">(</span><span style="color: #000000;">b</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">a</span><span style="color: #0000FF;">))</span>
end function
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
sequence a = {"John", "Serena", "Bob", "Mary", "Serena"},
<span style="color: #004080;">sequence</span> <span style="color: #000000;">a</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"John"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Serena"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Bob"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Mary"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Serena"</span><span style="color: #0000FF;">},</span>
b = {"Jim", "Mary", "John", "Jim", "Bob"}
<span style="color: #000000;">b</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"Jim"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Mary"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"John"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Jim"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Bob"</span><span style="color: #0000FF;">}</span>
?Symmetric_Difference(a,a)
<span style="color: #0000FF;">?</span><span style="color: #000000;">Symmetric_Difference</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a</span><span style="color: #0000FF;">,</span><span style="color: #000000;">a</span><span style="color: #0000FF;">)</span>
?Symmetric_Difference(a,b)
<span style="color: #0000FF;">?</span><span style="color: #000000;">Symmetric_Difference</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a</span><span style="color: #0000FF;">,</span><span style="color: #000000;">b</span><span style="color: #0000FF;">)</span>
?Symmetric_Difference(b,a)
<span style="color: #0000FF;">?</span><span style="color: #000000;">Symmetric_Difference</span><span style="color: #0000FF;">(</span><span style="color: #000000;">b</span><span style="color: #0000FF;">,</span><span style="color: #000000;">a</span><span style="color: #0000FF;">)</span>
?Symmetric_Difference(b,b)</lang>
<span style="color: #0000FF;">?</span><span style="color: #000000;">Symmetric_Difference</span><span style="color: #0000FF;">(</span><span style="color: #000000;">b</span><span style="color: #0000FF;">,</span><span style="color: #000000;">b</span><span style="color: #0000FF;">)</span>
<!--</lang>-->
{{Out}}
<pre>
Line 2,112 ⟶ 2,114:
{}
</pre>
You can also use the builtin (which defaults to symmetic differences), though it will crash if you pass it "sets" with duplicate elements.
<!--<lang Phix>(phixonline)-->
<span style="color: #008080;">include</span> <span style="color: #000000;">sets</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">a</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"John"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Serena"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Bob"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Mary"</span><span style="color: #0000FF;">},</span>
<span style="color: #000000;">b</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"Jim"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Mary"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"John"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Bob"</span><span style="color: #0000FF;">}</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">difference</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a</span><span style="color: #0000FF;">,</span><span style="color: #000000;">a</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">difference</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a</span><span style="color: #0000FF;">,</span><span style="color: #000000;">b</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">difference</span><span style="color: #0000FF;">(</span><span style="color: #000000;">b</span><span style="color: #0000FF;">,</span><span style="color: #000000;">a</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">difference</span><span style="color: #0000FF;">(</span><span style="color: #000000;">b</span><span style="color: #0000FF;">,</span><span style="color: #000000;">b</span><span style="color: #0000FF;">)</span>
<!--</lang>-->
Same output as above
 
=={{header|PHP}}==
Petelomax
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