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mapper.kernel.cosine


mapper
Since v1.0.0
Available on all platforms
See also

This function pushes onto the stack a kernel smoothing mapper using a [cosine kernel](https://en.wikipedia.org/wiki/Kernel_(statistics)#In_non-parametric_statistics. The mapper applies the Nadaraya-Watson kernel-weighted average algorithm.

Signature

Examples

NEWGTS 'random walk' RENAME 0.0 'i' STORE 1 1000 <% NaN NaN NaN $i RAND 0.5 - + DUP 'i' STORE ADDVALUE %> FOR DUP // Pseudo radius of the kernel (the kernel really has a diameter of 2 * radius + 1 steps) 8 'radius' STORE // Number of time units per radius unit 1 'step' STORE [ SWAP $step $radius 2 * 1 + mapper.kernel.cosine $radius $radius 0 ] MAP 0 GET '%2B:smoothed' RENAME