arrays - Get count of true in bool[,] F# -


I have a bool in F # [,] and I want to count the presence of truth. How can I do this without getting into compulsory programming?

This is my current solution, which is actually written in C # 

  For unstable x = 0 cells in cells, if cell = true then x

Here's a way: 

  let x = cell | & Gt; Seq.cast | & Gt; Seq.filter ID | & Gt; Seq.length

What does this false value filter out (see), and then guesses what is omitted after that


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