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_zseries_der(zs)

The derivative is with respect to x, not z. This is achieved using the chain rule and the value of dx/dz given in the module notes.

Notes

The zseries for x (ns) has been multiplied by two in order to avoid using floats that are incompatible with Decimal and likely other specialized scalar types. This scaling has been compensated by multiplying the value of zs by two also so that the two cancels in the division.

Parameters

zs : z-series

The z-series to differentiate.

Returns

derivative : z-series

The derivative

Differentiate a z-series.

Examples

See :

Local connectivity graph

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GitHub : /numpy/polynomial/chebyshev.py#277
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