Python oneliner to differentiate polynomial list: Difference between revisions
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== Theory == | == Theory == | ||
Let the polynomial be described in ascending order, thus <math>P(x) = 2 + 3x + 5x^2 + x^3</math> is written as a list <syntaxhighlight lang="Python" enclose="none">[2, 3, 5, 1]</syntaxhighlight >. The derivative <math>P'(x) = 3 + 10 x + 3x^2</math> equals a list <syntaxhighlight lang="Python" enclose="none"> [3, 10, 3]</syntaxhighlight> | |||
<syntaxhighlight lang="Python"> | <syntaxhighlight lang="Python"> | ||
poly = [2, 3, 5, 1] # Degrees starting from zero | poly = [2, 3, 5, 1] # Degrees starting from zero | ||
print( [(i+1)*j for i,j in enumerate( poly[1:] )] ) | print( [(i+1)*j for i,j in enumerate( poly[1:] )] ) | ||
<syntaxhighlight> | </syntaxhighlight> | ||
Latest revision as of 12:14, 5 August 2021
Introduction
Oneliners are powerful and often beautiful solutions to programming challenges (see Acklamization).
Theory
Let the polynomial be described in ascending order, thus is written as a list [2, 3, 5, 1]. The derivative equals a list [3, 10, 3]
poly = [2, 3, 5, 1] # Degrees starting from zero
print( [(i+1)*j for i,j in enumerate( poly[1:] )] )
