command real is unrecognized

[Mahdie Raj]

I am using a written code which utilizes the cohort-component method to conduct population projection. When I ran the following section of that code, I got an error: "command real is unrecognized".

real matrix Leslie(real vector L, real vector m) {
n = length(L)
M = J(n,n,0)

// lower diagonal has survivorship ratios
for (i=1; i < n; i++) {
M[i+1,i] = L[i+1]/L[i]
}
M[n,n-1] = M[n,n] = L[n]/(L[n-1]+L[n])

// first row has net maternity contributions
for(i=1; i < n; i++) {
if(m[i]==0 & m[i+1]==0) continue
M[1,i] = L[1]*(m[i] + m[i+1]*L[i+1]/L[i])/2
}
if (m[n] > 0) M[1,n] = L[1]*m[n]
return(M)
}

[Nick Cox]

You need a declaration mata first

[daniel klein]

This is Mata code that needs to be compiled first. My advice: check back with the person (source) who gave you that code and ask for guidance on how to run it. That is likely the quickest way to solve your problem.

Best
Daniel