Polynomial derivative: Difference between revisions
julia example
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IN: math.polynomials
: pdiff ( p -- p' ) dup length <iota> v* rest ;</lang>
=={{header|Julia}}==
<lang julia>using Polynomials
testcases = [
("5", [5]),
("-3x+4", [4, -3]),
("5x2+6x-1", [-1, 6, 5]),
("x3-2x2+3x-4", [-4, 3, -2, 1]),
("-x4-x3+x+1", [1, 1, 0, -1, -1]),
]
for (s, coef) in testcases
println("Derivative of $s: ", derivative(Polynomial(coef)))
end
</lang>{{out}}
<pre>
Derivative of 5: 0
Derivative of -3x+4: -3
Derivative of 5x2+6x-1: 6 + 10*x
Derivative of x3-2x2+3x-4: 3 - 4*x + 3*x^2
Derivative of -x4-x3+x+1: 1 - 3*x^2 - 4*x^3
</pre>
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