Haversine formula: Difference between revisions
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=={{header|Phix}}==
<!--<lang Phix>(phixonline)-->
<span style="color: #008080;">function</span> <span style="color: #000000;">haversine</span><span style="color: #0000FF;">(</span><span style="color: #004080;">atom</span> <span style="color: #000000;">lat1</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">long1</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">lat2</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">long2</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">MER</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">6371</span><span style="color: #0000FF;">,</span> <span style="color: #000080;font-style:italic;">-- mean earth radius(km)</span>
<span style="color: #000000;">DEG_TO_RAD</span> <span style="color: #0000FF;">=</span> <span style="color: #004600;">PI</span><span style="color: #0000FF;">/</span><span style="color: #000000;">180</span>
<span style="color: #000000;">lat1</span> <span style="color: #0000FF;">*=</span> <span style="color: #000000;">DEG_TO_RAD</span>
<span style="color: #000000;">lat2</span> <span style="color: #0000FF;">*=</span> <span style="color: #000000;">DEG_TO_RAD</span>
<span style="color: #000000;">long1</span> <span style="color: #0000FF;">*=</span> <span style="color: #000000;">DEG_TO_RAD</span>
<span style="color: #000000;">long2</span> <span style="color: #0000FF;">*=</span> <span style="color: #000000;">DEG_TO_RAD</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">MER</span><span style="color: #0000FF;">*</span><span style="color: #7060A8;">arccos</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">sin</span><span style="color: #0000FF;">(</span><span style="color: #000000;">lat1</span><span style="color: #0000FF;">)*</span><span style="color: #7060A8;">sin</span><span style="color: #0000FF;">(</span><span style="color: #000000;">lat2</span><span style="color: #0000FF;">)+</span><span style="color: #7060A8;">cos</span><span style="color: #0000FF;">(</span><span style="color: #000000;">lat1</span><span style="color: #0000FF;">)*</span><span style="color: #7060A8;">cos</span><span style="color: #0000FF;">(</span><span style="color: #000000;">lat2</span><span style="color: #0000FF;">)*</span><span style="color: #7060A8;">cos</span><span style="color: #0000FF;">(</span><span style="color: #000000;">long2</span><span style="color: #0000FF;">-</span><span style="color: #000000;">long1</span><span style="color: #0000FF;">))</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #004080;">atom</span> <span style="color: #000000;">d</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">haversine</span><span style="color: #0000FF;">(</span><span style="color: #000000;">36.12</span><span style="color: #0000FF;">,-</span><span style="color: #000000;">86.67</span><span style="color: #0000FF;">,</span><span style="color: #000000;">33.94</span><span style="color: #0000FF;">,-</span><span style="color: #000000;">118.4</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Distance is %f km (%f miles)\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">d</span><span style="color: #0000FF;">,</span><span style="color: #000000;">d</span><span style="color: #0000FF;">/</span><span style="color: #000000;">1.609344</span><span style="color: #0000FF;">})</span>
<!--</lang>-->
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