November 2018
Intermediate to advanced
460 pages
14h 1m
English
Content preview from Julia 1.0 Programming Cookbook
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How to do it...
To see how functional programming works in Julia, observe the following steps:
- In this recipe, we start by creating a function that generates as its result a new function that is a derivative of the original:
function deriv(f::Function)::Function h = √eps() f1(x) = (f(x+h)-f(x))/h return f1end
- Let's test the deriv function. We will use the UnicodePlots.jl package to plot a 2x*x+ 5x-4 function and its derivative. Let's us now test the deriv function. We will use the UnicodePlots.jl package to plot a 2x*x+ 5x-4 function and its derivative:
using UnicodePlotsf(x) = 2x*x + 5x - 4;x = -5:3;
- Now we perform the plotting in the Julia command line:
plot = lineplot(x, f.(x), width=45, height=15, canvas=DotCanvas, name="f(x)"Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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