Fix issue#28

JuliaStats · Nov 2, 2020 · 551630b · 551630b
1 parent 9ab7f92
commit 551630b
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/interf.jl b/src/interf.jl
@@ -7,6 +7,8 @@ function nnmf(X::AbstractMatrix{T}, k::Integer;
               tol::Real=cbrt(eps(T)/100),
               verbose::Bool=false) where T
 
+    eltype(X) <: Number && all(X .>= zero(T)) || throw(ArgumentError("The elements of X must be non-negative."))
+
     p, n = size(X)
     k <= min(p, n) || throw(ArgumentError("The value of k should not exceed min(size(X))."))