How to Plot with gr() at the same time with showing computation result at the terminal Julia REPL?

General Usage
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1

Hi all,

this is a double problems but want to be combined as one.

I want to show a plot of function (just simple plot, no need for the Newton’s method iteration shown, but if it is possible you can tell me).

Plus the result of the root obtained / the solution of the Newton method. I am using MTH229

(+) I want to ask whether using f'(x) is better than SymPy? How to check it? btime?
(-) I have to type at terminal manually plot(f) to show the graph. I want it to be automatically shown at the same time as the result from the Newton’s method iterations.

this is my code:

# Julia for Newton's method 

using MTH229, Plots, LaTeXStrings, SymPy
gr()
@vars x

f(x) = sin(x) - x/4
fp(x) = f'(x)

plot(f, -10, 10, ylims=(-5,10),
    label=L"f(x)", framestyle=:zerolines,
     legend=:outerright)

newton(f, fp, 2pi, verbose=true)

#type at terminal: plot(f)

Capture d’écran_2022-11-20_23-13-39
Capture d’écran_2022-11-20_23-13-391175×657 95.8 KB

2

Just do display(plot(...)) or swap the calls around so that plot is called last and to println(newton(...)) to print the result to the REPL?

3

I know why use display(plot(...)) does not work neither put plot on the last.

I am still using Julia 1.7.3 and hesitate to upgrade due to afraid of no backward compatibility for old codes…

4

Sorry I’m not sure I understand - you’ve marked my post as the solution but are you saying it’s not actually working?

I would not worry about upgrading from 1.7 to 1.8, it’s an upgrade from one minor release to another which by Semver rules is non-breaking (also you can install multiple Julia versions in parallel so checking whether this works probably takes all of ten minutes and won’t affect your 1.7 installation).

5

Yes it is not working to show the plot at the same time as the computation for Newton’s method, but since I haven’t use newer Julia version I mark it as solution, who knows the problem is in my Julia version.

I will try to make Julia installation parallel then. Thanks!