How to add other arguments to function turned to LinearOperator?

General Usage
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4

I figured it out.

You can use an anonymous function inside another anonymous function such as:

customfunc = (N, dt, nu) -> (Z,U,alpha,beta) -> begin

for i in 1:N
Z[i] = U[i]*dt*(nu[i]+nu[i+1])/2.0
end
return Z
end

Then you initialize with your parameters:

N =12
dt = 0.5
nu=0.01
custmul! = customfun(N,dt,nu)

Then you can put this into a linear operator because this is now a 4 argument function that works as:

custmul!(Out, In, alpha, beta)