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Eq 1 &em;&em; [math]\displaystyle{ y=\pm\sqrt{1-x^{2}} }[/math] &em;&em;&em;&em; (Equation for circle.)

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The following is a hypothetical exercise...

The Wikipede edits wikipedia:Myriapoda.

This example is supposed to show how thumbnails can be made to display by default, as well as how inter-WiKi links work.

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The following is some code which has been suggested, to compute the reciprocal square root using a trick. It may not be helpful, because this code requires that the language implementation can already convert a floating-point number into its 64-bit representation.

<syntaxhighlighter lang="cpp"> /* Fast Inverse Square Root, using Matthew Robertson's

* Magic Number for double-precision floating-point.
* 
* Implemented August 2, 2024
* by Dirk Mittler
* 
*/

1. include <cstring>
2. include <cstdint>

typedef double float64_t;

float64_t Q_rsqrt(const float64_t number) noexcept { const float64_t threehalfs = 1.5; const float64_t halfnum = 0.5 * number; uint64_t temp; float64_t y; static_assert(sizeof(uint64_t) == sizeof(number), "`double` has a weird size."); memcpy(&temp, &number, sizeof(float64_t)); // temp = 0x5f3759df - (temp >> 1); // Original 32-bit fr Quake III temp = 0x5FE6EB50C7B537A9 - (temp >> 1); // Matthew Robertson's memcpy(&y, &temp, sizeof(float64_t)); y *= (threehalfs - (halfnum * y * y)); y *= (threehalfs - (halfnum * y * y)); y *= (threehalfs - (halfnum * y * y)); return y * (threehalfs - (halfnum * y * y)); }

</syntaxhighlighter>