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Results tagged with lookup
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user 129343
A lookup (table) is an array that replaces run-time computation with a simpler array indexing operation. The savings in terms of processing time can be significant, since retrieving a value from memory is often faster than undergoing an 'expensive' computation or input/output operation. Over time the definition has become less strict, any kind of searching with a key value can be considered a lookup.
20
votes
Sine function calculated via look-up table and linear interpolation
You only need to store values for \$\left[0, \frac{1}{2}\pi\right)\$
You can exploit the structure of the sine function, and only store values in the table for inputs between 0 and \$\frac{1}{2}\pi\$. …
- 61.7k
3
votes
Accepted
Optimize the FFT calculation in C++ without creating even/odd arrays
Precalculate the roots of unity
How to optimize this to use a lookup table or precomputed values.
Yes, just do that. …
- 61.7k