plot cost function fo estimate multiple parameters

[kikiggg]

using DifferentialEquations, RecursiveArrayTools, Plots, DiffEqParamEstim

function f2(du,u,p,t)
    du[1] = dx = p[1]*u[1] - p[2]*u[1]*u[2]
    du[2] = dy = -p[3]*u[2] + p[4]*u[1]*u[2]
  end
  
  u0 = [1.0;1.0]
  tspan = (0.0,10.0)
  p = [1.5,1.0,3.0,1.0]
  prob = ODEProblem(f2,u0,tspan,p)

  sol = solve(prob,Tsit5())
t = collect(range(0,stop=10,length=200))

randomized = VectorOfArray([(sol(t[i]) + .01randn(2)) for i in 1:length(t)])
data = convert(Array,randomized)

vals = 0.0:0.1:10.0

plot(vals,[cost_function(i) for i in vals],yscale=:log10,  xaxis = "Parameter", yaxis = "Cost", 
title = "Parameter Cost Function", lw = 3)

hi im learning parameter estimation but problem is plotting cost function with multiple parameters as a example.
With Boundserror could not be plotted
im literally noob with code, i was trying tof fix it but i could not...
How can i get plot ?

[ChrisRackauckas]

Discourse or Slack is a better place for this question as it's not a bug report. https://discourse.julialang.org/

But what you need to do is define your cost function and then pass it the array of parameters to evaluate at.