Python oneliner to differentiate polynomial list: Difference between revisions

Revision as of 11:41, 5 August 2021

Oneliners are powerful and often beautiful solutions to programming challenges (see Acklamization).

Let the polynomial be described in ascending order, thus $P(x)=2+3x+5x^{2}+x^{3}$ is written as a list

[2, 3, 5, 1]

. The derivative is $P'(x)=3+10x+3x^{2}$ 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:] )] )

@@ Line 5: / Line 5: @@
 == Theory ==
-#D(poly) = 2*0 + 3*1 + 5*2 + 1*3
+Let the polynomial be described in ascending order, thus <math>P(x) = 2 + 3x + 5x^2 + x^3</math> is written as a list <pre>[2, 3, 5, 1]</pre>. The derivative is <math>P'(x) = 3 + 10 x + 3x^2</math> equals a list <pre> [3, 10, 3</pre>
-#Dpoly = [3, 10, 3]
 <syntaxhighlight lang="Python">
 poly = [2, 3, 5, 1]  # Degrees starting from zero
 print( [(i+1)*j for i,j in enumerate( poly[1:] )] )
 </syntaxhighlight>